Service

Repair Manual
A4 2002 ➤
Generic Scan Tool
Engine ID AMB

Edition 09.2006

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Service Department. Technical Information

 Service
List of Workshop Manual Repair Groups

Repair Group
ST - Generic Scan Tool
20 - Fuel Supply
21 - Turbocharger, G-Charger
24 - Multiport Fuel Injection
26 - Exhaust System, Emission Controls
28 - Ignition/Glow Plug System
38 - Automatic Transmission-Gears, Hydraulic Controls

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Technical information should always be available to the foremen and mechanics, because their
careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and
safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a
matter of course, be observed.

All rights reserved.

No reproduction without prior agreement from publisher.

Copyright © 2009 Audi AG, Ingolstadt D3E800E0E67

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

Contents

ST - Generic Scan Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1 On Board Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Generic Scan Tool Manual Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 On Board Diagnostic Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.3 Malfunction Indicator Lamp Illumination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.4 Controller Area Network Data Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.5 Electronic Power Control Warning Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Diagnostic Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Diagnostic Mode 01 - Read Current System Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Diagnostic Mode 02 - Read Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Diagnostic Mode 03 - Read DTC Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Diagnostic Mode 04 - Erase DTC Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Diagnostic Mode 05 - Read Oxygen Sensor Monitoring Test Results . . . . . . . . . . . . . . . . 9
2.6 Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions . . . . . . . . . . . . 11
2.7 Diagnostic Mode 07 - Read Faults Detected During the Current or Last Driving Cycle . . . . 15
2.8 Diagnostic Mode 08 - Request Control of On-Board System, Test or Component . . . . . . 16
2.9 Diagnostic Mode 09 - Read Vehicle Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3 Readiness Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 DTC Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 SAE P0xxx DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2 SAE P1xxx DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.3 SAE P2xxx DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.4 SAE P3xxx DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

20 - Fuel Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
1 Fuel Supply System, Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
1.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
1.2 Clean Working Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
1.3 Fuel Pump, Electrical Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
1.4 Fuel Pump Delivery Quantity, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
2 EVAP System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
2.1 EVAP System, Leak Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
2.2 EVAP System, Checking for Proper Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
2.3 EVAP Canister Purge Regulator Valve, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
2.4 Leak Detection Pump, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3 Electronic Engine Power Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.1 Function of EPC System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.2 Throttle Position Sensor/Accelerator Pedal Position Sensor 2, Checking . . . . . . . . . . . . . . 77

21 - Turbocharger, G-Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
1 Turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
1.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
1.2 Clean Working Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
1.3 Turbocharger Recirculating Valve, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
1.4 Wastegate Bypass Regulator Valve, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
2 Charge Air System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
2.2 Clean Working Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
2.3 Charge Air Pressure Sensor, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

24 - Multiport Fuel Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

1 Fuel Injection System, Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Contents i
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

1.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

1.2 Clean Working Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
1.3 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
2 Components, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
2.1 Oxygen Sensor Heater before Catalytic Converter, Checking . . . . . . . . . . . . . . . . . . . . . . 96
2.2 Oxygen Sensor after Catalytic Converter, Checking Heater . . . . . . . . . . . . . . . . . . . . . . . . 98
2.3 Mass Air Flow Sensor, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
2.4 Throttle Valve Control Module, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
2.5 Engine Coolant Temperature Sensor, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
2.6 Intake Air Temperature, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
2.7 Engine Speed Sensor, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
2.8 Fuel Injectors, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
3 Functions, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
3.1 Heated Oxygen Sensor and Sensor Regulation before Catalytic Converter, Checking . . . . 122
3.2 Oxygen Sensor and Sensor Regulation after Catalytic Converter, Checking . . . . . . . . . . 124
4 Engine Control Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
4.1 Engine Control Module Power Supply Relay, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . 128
4.2 Engine Control Module, Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
5 Additional Signals, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
5.1 Speed Signal, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
5.2 Can-Bus Terminal Resistance, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
135
with respect to the correctness of information in this document. Copyright by AUDI AG.
26 - Exhaust System, Emission Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
1 Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
1.1 Three Way Catalytic Converter, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
2 Secondary Air Injection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
2.1 Secondary Air Injection Solenoid Valve, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
2.2 Secondary Air Injection Pump Relay, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
2.3 Secondary Air Injection Pump Motor, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

28 - Ignition/Glow Plug System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

1 Ignition System, Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
1.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
1.2 Test Data, Spark Plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
1.3 Camshaft Position Sensor, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
1.4 Camshaft Adjustment Valve 1, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
1.5 Knock Sensors, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
1.6 Ignition Coils with Power Output Stage, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

38 - Automatic Transmission-Gears, Hydraulic Controls . . . . . . . . . . . . . . . . . . . . . . 160

1 Continuously Variable Transmission, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

ii Contents
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

ST – Generic Scan Tool

1 On Board Diagnostic
⇒ “1.1 Generic Scan Tool Manual Contents”, page 1
⇒ “1.2 On Board Diagnostic Systems”, page 1
⇒ “1.3 Malfunction Indicator Lamp Illumination”, page 1
⇒ “1.4 Controller Area Network Data Link”, page 2
⇒ “1.5 Electronic Power Control Warning Lamp”, page 2

1.1 Generic Scan Tool Manual Contents

Included in the contents of this Generic Scan Tool (GST) manual
is a summary table of the vehicle specific OBD II Emission Rela‐
ted Engine and Transmission DTC's. This table contains all nec‐
essary Malfunction Criteria, Threshold Values, Secondary Pa‐
rameters, Enabling Conditions, Monitoring Time Length,
Frequency of Checks, and Mil. Illumination to accurately monitor
and diagnose the Engine Emissions and Transmission and per‐
form all functions required to run Modes 01 through 09 with a hand
held scan tool. For a further description of the monitor strategies,
a document reference has been provided throughout this Generic
Scan Tool (GST) manual and can be easily identified as. e.g. ⇒
Bosch Motronic ME 7 OBD System Strategy .
This Generic Scan Tool (GST) manual also contains the step by
step pin point test procedures to accurately diagnose and repair
the suspected component or system once a DTC has been set.
All references to repair procedures and wiring diagrams will be
found within the diagnostic test procedure and easily identified as.
e.g. ⇒ page 93 .

1.2 On Board Diagnostic Systems

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
OBD II permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
”OBD” is an abbreviation for the On Board Diagnostic System.
California OBD-II applies to all gasoline engine vehicles up to
14,000 lbs. Gross Vehicle Weight Rating (GVWR) starting in the
1996 MY and all diesel engine vehicles up to 14,000 lbs. GVWR
starting in the 1997 MY.
Several states in the Northeastern United States have chosen to
adopt the California emission regulations starting in the 1998 MY
and are known as "Green States".
Green States receive California-certified vehicles for passenger
cars and light trucks up to 6,000 lbs. GVWR. Starting in the 2004
MY, Federal vehicle over 8,500 lbs. will start phasing in OBD-II.
Starting in 2004 MY, gasoline-fueled Medium Duty Passenger
Vehicles (MDPVs) are required to have OBD-II. Federal OBD-II
applies to all gasoline engine vehicles up to 8,500 lbs. GVWR
starting in the 1996 MY and all diesel engine vehicles up to 8,500
lbs. GVWR starting in the 1997 MY.
OBD-II system implementation and operation is described in the
remainder of this document.

1.3 Malfunction Indicator Lamp Illumination

”MIL” is an abbreviation for the Malfunction Indicator Lamp (MIL) .
If the Engine Control Module (ECM) recognizes a malfunction that
leads to increased emissions values, it indicates them by lighting

1. On Board Diagnostic 1
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

the Malfunction Indicator Lamp (MIL) which is located in the in‐

strument cluster.
The Engine Control Module (ECM) switches on the Malfunction
Indicator Lamp (MIL) after the ignition is switched on. Shortly after
the engine is started, The Malfunction Indicator Lamp (MIL) goes
out if the Engine Control Module (ECM) does not detect a mal‐
function that increases the emissions values.
If the Engine Control Module (ECM) recognizes a malfunction that
leads to increased emissions during the operation of the engine,
the Engine Control Module (ECM) switches on the Malfunction
Indicator Lamp (MIL) and an entry is stored in the DTC memory
of the Engine Control Module (ECM) .

1.4 Controller Area Network Data Link

”CAN” is an abbreviation for Controller Area Network.
The Engine Control Module (ECM) communicates with all data‐
bus capable control modules via a CAN Data Link.
The databus capable control modules (i.e. Engine Coolant tem‐
perature Sensor) are connected via two data bus wires which are
twisted together (CAN_High and CAN_Low), and exchange in‐
formation (messages) to the Engine Control Module (ECM) .
Missing information on the databus is then recognized and stored
as a malfunction.
The Engine Control Module (ECM) illuminates the Malfunction
Indicator Lamp (MIL) through the CAN data link and tells the Mal‐
function Indicator Lamp (MIL) to turn on, turn off, or blink.

1.5 Electronic Power Control Warning Lamp

”EPC” is an abbreviation
Protected thatforstands
by copyright. Copying private or for the Electronic
commercial Power
purposes, in part or in whole, is not
Controlpermitted
(E-gas). unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
The Engine Control Module (ECM) monitors all EPC components
after the ignition is switched on.
If a malfunction is recognized in the EPC system during the op‐
eration of the engine, the Engine Control Module (ECM) switches
on the Electronic Power Control (EPC) Warning Lamp which is
located in the instrument cluster and an entry is stored in the DTC
memory of the Engine Control Module (ECM) .

2 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

2 Diagnostic Modes
⇒ “2.1 Diagnostic Mode 01 - Read Current System Data”,
page 3
⇒ “2.2 Diagnostic Mode 02 - Read Operating Conditions”,
page 5
⇒ “2.3 Diagnostic Mode 03 - Read DTC Memory”, page 6
⇒ “2.4 Diagnostic Mode 04 - Erase DTC Memory”, page 8
⇒ “2.5 Diagnostic Mode 05 - Read Oxygen Sensor Monitoring
Test Results”, page 9
⇒ “2.6 Diagnostic Mode 06 - Read Test Results for Specific Di‐
agnostic Functions ”, page 11
⇒ “2.7 Diagnostic Mode 07 - Read Faults Detected During the
Current or Last Driving Cycle”, page 15
⇒ “2.8 Diagnostic Mode 08 - Request Control of On-Board Sys‐
tem, Test or Component ”, page 16 Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
⇒ “2.9 Diagnostic Mode 09 - Read Vehicle Information”,
with respect to the correctness of information in this document. Copyright by AUDI AG.
page 17
Diagnostic Modes Description
The information provided in Modes 01 through 09 displays the
various levels of emission related data that may be monitored, as
well as the ability to retrieve and read stored DTC trouble codes ,
erase stored DTC trouble codes, generate readiness codes, and
select the various PIDs and OBDMIDs used within the modes to
monitor the engine, and emission related component parameters.
The following table provides a link to all diagnostic modes that
monitor all components and systems which influence the emis‐
sion quality.

Note

Depending on scan tool and protocol used, the information dis‐

played may be referred to by different names such as OBDMID
(TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Moni‐
tor Identifier (OBDMID), or contain no name at all and be refer‐
enced by only a number.

2.1 Diagnostic Mode 01 - Read Current Sys‐

tem Data
Diagnostic Mode 01 makes it possible to access current emis‐
sions-related measured values and diagnostic data. The original
measured values (no replacement values), input and output data
and system status information are displayed using Diagnostic
Mode 1.
Depending on scan tool and protocol used, the information dis‐
played in diagnostic mode 01 may be referred to by different
names such as OBDMID (TID), Hex-ID, Component-ID (CID),
On-Board Diagnostic Monitor Identifier (OBDMID), or contain no
name at all and be referenced by only a number.
Test requirement
• Coolant temperature at least 80° C.
Procedure
– Connect the scan tool.

2. Diagnostic Modes 3
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Start the engine and run at idle.

– Select “Diagnostic Mode 1: Obtain data.”.
– From the following table, select the desired the “PID” that is to
be monitored, e.g. “PID 05-Coolant temperature”.
The current values of the component or system that is being
monitored will be displayed on the scan tool screen.
PID Component or System
01: Monitoring status since
erasing DTC memory
03: Condition of fuel system
04: Calculated load condition value
05: Coolant temperature
06: Short term gasoline-air ratio
bank 1
07: Gasoline-air ratio bank 1
12: Engine rotations per minute
(RPM)
13: Vehicle speed
14: Ignition timing adjustment at
1. cyl. in direction
15: Intake air temperature (IAT)
16: Air flow quantity at
Mass Air Flow (MAF) sensor
17: Throttle valve position (absolute)
19: Existing oxygen B1 to B2-S2
to (exist./non exist.)
21: Bank 1 - sensor 2
28: OBD request is designed
for diagnostic of this vehicle
31: Time after engine on
33: Driven distance after MIL on
35: Fuel Rail Pressure
46: Commanded Evaporative Purge
48: Number of warm ups since
diagnostic trouble codes
49: Distance since diagnostic
trouble codes cleared
51: Barometric Pressure
52: BankProtected
1 - sensor 1
by copyright. Copying for private or commercial purposes, in part or in whole, is not
56: Bankpermitted
2- sensorunless 1
authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
60: Catalyst Temperature
Bank 1, Sensor 1
65: Monitor status this driving cycle
66: Control module voltage
67: Absolute Load Value
68: Commanded Equivalence Ratio
69: Relative Throttle Position
70: Ambient air temperature
71: Absolute Throttle Position B
73: Accelerator Pedal Position D
74: Accelerator Pedal Position E

4 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

PID Component or System

76: Commanded Throttle Actuator
Control

– Switch the ignition off.

– End of diagnosis.

2.2 Diagnostic Mode 02 - Read Operating

Conditions
When an emissions-related fault (pending DTC, visible in mode
07) is first detected, operating conditions are stored. Mode 02
makes it possible to access this freeze frame data as soon as this
fault is shown in mode 03. Each control module only shows freeze
frame data for one fault via mode 02. Therefore, there are two
priority levels. If there is a malfunction with higher priority, the
freeze frame data is overwritten.
– Fault with higher priority: Misfire malfunction or fuel trim mal‐
function.
– Fault with normal priority: All other emissions-related faults.
Depending on scan tool and protocol used, the information dis‐
played
unlessin diagnostic
by AUDImode 02AGmay beguarantee
referred to byanydifferent
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted authorised AG. AUDI does not or accept liability
names
with respect tosuch as OBDMID
the correctness (TID),
of information in thisHex-ID, Component-ID
document. Copyright by AUDI AG. (CID),
On-Board Diagnostic Monitor Identifier (OBDMID), or contain no
name at all and be referenced by only a number.
Procedure
– Connect the scan tool.
– Start the engine and run at idle.

Note

If the engine does not start, crank the engine using starter for at
least 5 seconds, do not switch the ignition off afterward under any
circumstances.

– Select “Diagnostic Mode 2: Obtain operating conditions.”.

– From the following table, select the desired the “PID”, e.g. “PID
05-Coolant temperature” that is to be monitored.
The current values of the component or system that is being
monitored will be displayed on the scan tool screen.
PID Component or System
02: DTC which triggered the current reception of
all control module information
03: Condition of fuel system
04: Calculated load condition value
05: Coolant temperature
06: Short term gasoline-air ratio
bank 1
07: Gasoline-air ratio bank 1
12: Engine rotations per minute
(RPM)
13: Vehicle speed

2. Diagnostic Modes 5
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

PID Component or System

14: Ignition timing adjustment at
1. cyl. in direction
15: Intake air temperature (IAT)
16: Air stream amount at
Mass Air Flow (MAF) sensor
17: Throttle valve position (absolute)
31: Time after engine on
35: Fuel Rail Pressure
46: Commanded Evaporative Purge
51: Barometric Pressure
66: Control module voltage
67: Absolute Load Value
68: Commanded Equivalence Ratio
69: Relative Throttle Position
70: Ambient air temperature
71: Absolute Throttle Position B
73: Accelerator Pedal Position D
74: Accelerator Pedal Position E
76: Commanded Throttle Actuator
Control

– Switch the ignition off.

– End of diagnosis.

2.3 Diagnostic Mode 03 - Read DTC Mem‐

ory
Diagnostic Mode 03 makes it possible to read emissions-related
faults (confirmed DTCs: faults which have activated the MIL) in
the ECM and in the TCM.
When the Engine Control Module (ECM) recognizes an emission
related fault it turns on the Malfunction Indicator Lamp (MIL) or if
a Electronic Throttle Malfunction is recognized, the Engine Con‐
trol Module (ECM) turns onProtected
the Electronic PowerforControl
by copyright. Copying (EPC) purposes, in part or in whole, is not
private or commercial
Warning Lamp which are both located
permitted in the instrument
unless authorised cluster.
by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
The DTC's are sorted by SAE code with the DTC tables consisting
of a 5-digit alpha-numeric value.
Depending on scan tool and protocol used, the information dis‐
played in diagnostic mode 03 may be referred to by different
names such as OBDMID (TID), Hex-ID, Component-ID (CID),
On-Board Diagnostic Monitor Identifier (OBDMID), or contain no
name at all and be referenced by only a number.
The following tables provide a breakdown and explanation of the
DTC code.
P-Codes
Component group
P x x x x DTC for the drivetrain
Norm-Code
P 0 x x x Trouble codes defined by SAE with
specified malfunction texts

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 A4 2002 ➤
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P 1 x x x Additional emission relevant DTCs

provided by the manufacturer
P 2 x x x DTCs defined by SAE with specified
texts, from MY 2000
P 3 x x x Additional emission relevant DTCs
provided by the manufacturer from
MY 2000

Component group
Repair group
P x 0 x x Fuel and air mixture and additional
emission regulations
P x 1 x x Fuel and air ratios
P x 2 x x Fuel and air ratios
P x 3 x x Ignition system
P x 4 x x Additional exhaust system
P x 5 x x Speed and idle control
P x 6 x x Control module and output signals
P x 7 x x Transmission
P x 8 x x Transmission
P x 9 x x Control modules, input and output
signals

U-Codes
Component group
U x x x x DTC for network (CAN bus)
Norm-Code
U 0 x x x Trouble codes defined by SAE with
specified malfunction texts

Procedure
– Connect the scan tool.
– Switch the ignition to the “ON” position.
– Select “Diagnostic Mode 03: Interrogating fault memory ”.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– The stored DTC or DTC's
permitted will be by
unless authorised displayed
AUDI AG. AUDIon AG thedoesscan tool or accept any liability
not guarantee
screen. with respect to the correctness of information in this document. Copyright by AUDI AG.

The following table is an example of the DTC information that may

be displayed on the scan tool screen:
Indication example Explanation
P0444 SAE Diagnostic Trouble Code (DTC)
Evaporative Emission (EVAP) Canister Malfunctioning wiring path or malfunctioning
Purge Regulator Valve component
Circuit Open Malfunction type as next

– Refer to the following DTC tables for the diagnostic repair pro‐
cedure:

2. Diagnostic Modes 7
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

♦ SAE P0xxxDTCs ⇒ page 20 .

♦ SAE P1xxx-DTCs ⇒ page 51 .
♦ SAE P2xxxDTCs ⇒ page 55 .
♦ SAE P3xxxDTCs ⇒ page 59 .
– Switch the ignition off.
– End of diagnosis.

2.4 Diagnostic Mode 04 - Erase DTC Mem‐

ory
Diagnostic Mode 04 makes it possible to erase the DTC memory
and to reset all emissions-related diagnostic data. In that way, all
faults in the DTC memory in the ECM and TCM are erased. The
adaptation values may also be reset.
Emissions-related diagnostic data includes (as applicable):
♦ - MIL Status
♦ - Number of DTCs
♦ - Readiness Bits
♦ - Confirmed DTCs
♦ - Pending DTCs
♦ - DTC that belongs to freeze frame
♦ - Freeze frame data
♦ - Test results of specific diagnostic functions
♦ - Distance driven with “MIL ON”
♦ -Protected
Number of Warm-Up
by copyright. Cycles
Copying for private orafter erasing
commercial thein DTC
purposes, part or inmemory
whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
♦ - Distance
with respect driven after erasing
to the correctness the
of information DTC
in this memory
document. Copyright by AUDI AG.

♦ - Misfire counter
Depending on scan tool and protocol used, the information dis‐
played in diagnostic mode 04 may be referred to by different
names such as OBDMID (TID), Hex-ID, Component-ID (CID),
On-Board Diagnostic Monitor Identifier (OBDMID), or contain no
name at all and be referenced by only a number.
Procedure
– Connect the scan tool.
– Switch the ignition on.
– Select “Diagnostic Mode 03: Interrogating fault memory ”.
– Then select “Mode 4: Reset/delete diagnostic data”.
The scan tool will display: “Diagnostic data are being erased”.
– Switch the ignition off.
– End of diagnosis.

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2.5 Diagnostic Mode 05 - Read Oxygen

Sensor Monitoring Test Results

Note

Mode 05 may not be supported on all systems. On systems where

Diagnostic Mode 05 is not supported, refer to Diagnostic Mode 6
for Oxygen Sensor Monitoring Test Results.

Diagnostic Mode 05 allows access to the Oxygen Sensor test re‐

sults. Mode 05 is divided into test identifiers (TIDS).
The values of the individual test results must reach the specified
value or must be within the min. and max. limits.
Depending on scan tool and protocol used, the information dis‐
played in diagnostic mode 05 may be referred to by different
names such as Test-ID (TID), Hex-ID, Component-ID (CID), On-
Board Diagnostic Monitor Identifier (OBDMID), or contain no
name at all and be referenced by only a number.
Test requirements
• Exhaust system
Protected must
by copyright. be properly
Copying for private orsealed between
commercial purposes, inthe
partcatalytic
or in whole, is not
converter
permittedand
unlessthe cylinder
authorised by AUDIheads.
AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• No DTCs stored in the DTC memory.
• Coolant temperature at least 80° C.
Work procedure
– Connect the scan tool.
– Start the engine and run at idle.

Note

If the engine does not start, crank the engine using starter for at
least 5 seconds, do not switch the ignition off afterward under any
circumstances.

– Select “Mode 5: Check lambda test results.”.

– Select the desired “Test-ID” of the component or system that
is to be monitored, e.g. “Test-ID 08: Oxygen Sensor Monitor
Bank 1 - Sensor 1”.
– Select the desired “Test-ID”.
The current minimum and maximum values will be displayed on
the scan tool screen.
The following table is a numerical list of all“Test-IDs” or “Hex-IDs”
that may be selected.
Test-ID (Hex-ID) Component or System
“Test A”: ⇒ page 10 Test results for Oxygen Sensor In Front of Catalytic Con‐
verter Bank 1 - Sensor 1
“Test A”: ⇒ page 10 Test results for Oxygen Sensor Behind Catalytic Con‐
vertor
Bank 1 - Sensor 2

2. Diagnostic Modes 9
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

“Test A”: Test results for Oxygen Sensor Monitor Bank 1 - Sensor
1
– Connect the scan tool.
– Start the engine and run at idle.
– Select “Mode 5: Check lambda test results”.
Select “Test A”.
– Select the desired “Test-ID (TID)” or “Hex-ID”.
– Check specified values at idle. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Test-ID (TID) DTC Component or System Min. Max. Additional Information
with respect to the correctness of information in this document. Copyright by AUDI AG.

(Hex-ID)
129 ($81) --- Oxygen Sensor actual Value --- --- No DTC
120 ($82) --- Oxygen Sensor specified Value --- --- No DTC
131 ($83) P0133 Response Check. For additional --- < 0.7 Refer to DTC P0133 in
information, sec‐ the DTC table
refer to the Bosch Motronic ME 7 onds ⇒ page 25 .
OBD
System Strategy. Page 33.
132 ($84) P1176 Rationality Check. For additional Refer to DTC P1176 in
information, the DTC table
refer to the Bosch Motronic ME 7 ⇒ page 51 .
OBD
System Strategy. Page 33.

– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “Mode 03: Interrogating Fault Mem‐
ory” to check for stored DTC's or the corresponding diagnostic
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.
“Test B”: Test results for Oxygen Sensor Monitor Bank 1- Sensor
2
– Connect the scan tool.
– Start the engine and run at idle.
– Select “Mode 5: Check lambda test results”.
Select “Test B”.
– Select the desired “Test-ID (TID)” or “Hex-ID”.
– Check specified values at idle.
Test-ID DTC Component or System Min. Max. Additional Information
(TID)
(Hex-ID)
01 ($01) No DTC Voltage from rich to lean — — —
02 ($02) No DTC Voltage from lean to rich — — —
07 ($07) No DTC Sensor voltage value 0 mV 450 mV —
08 ($08) P0138 Short to Battery Check. 0V > 1.08 V Refer to DTC P0138 in
For additional information, refer the DTC summary table.
to the Bosch Motronic ME 7 ⇒ page 26 .
OBD
System Strategy. Page 26.

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 A4 2002 ➤
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– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “Mode 03: Interrogating Fault Mem‐
ory” to check for stored DTC's or the corresponding diagnostic
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.

2.6 Diagnostic Mode 06 - Read Test Results

for Specific Diagnostic Functions
Diagnostic Mode 06 makes it possible to retrieve test results for
special components and systems which are continuously or not
continuously monitored. If the diagnosis of a system is complete,
the diagnostic result and the corresponding thresholds are saved
and displayed in mode 06. This data remains saved (even with
the ignition off) until either new diagnostic results become
Protected avail‐Copying for private or commercial purposes, in part or in whole, is not
by copyright.
able or the DTC memory is erased. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
The values of the individual test results must reach the specified
value or must be within the min. and max. limits.
Depending on scan tool and protocol used, the information dis‐
played in diagnostic mode 06 may be referred to by different
names such as Test-ID (TID), Hex-ID, Component-ID (CID), On-
Board Diagnostic Monitor Identifier (OBDMID), or contain no
name at all and be referenced by only a number.
Test requirements
• Exhaust system must be properly sealed between the catalytic
converter and the cylinder heads.
• No DTCs stored in the DTC memory.
• Coolant temperature at least 80° C.
Work procedure
– Connect the scan tool.
– Start the engine and run at idle.

Note

If the engine does not start, crank the engine using starter for at
least 5 seconds, do not switch the ignition off afterward under any
circumstances.

– Select “Mode 6: Check test the results of components that are

not continuously monitored”.
– Select the desired “Test-ID” of the component or system that
is to be monitored, e.g. “Test-ID 01: Oxygen Sensor Monitor
Bank 1 - Sensor 1”.
– Select the desired “Test-ID”.
The current minimum and maximum values will be displayed on
the scan tool screen.
The following table is a numerical list of all“Test-IDs” or “Hex-IDs”
that may be selected.
Test-ID (Hex-ID) Component or System
01 ($01): ⇒ page 12 Catalytic Conversion (Bank 1)
02 ($02): ⇒ page 12 Oxygen Sensor Bank 1- Sensor 1
03 ($03) ⇒ page 13 Secondary Air Injection (AIR) System
05 ($05): ⇒ page 13 Tank Ventilation System, Tank Vent Valve Function

2. Diagnostic Modes 11
 A4 2002 ➤
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Test-ID (Hex-ID) Component or System

05 ($05): ⇒ page 14 Tank Ventilation System, Tank Leak Test

TID 01 ($01): Catalytic Conversion (Bank 1)

– Connect the scan tool.
– Start the engine and run at idle.
– Select “Mode 6: Check test the results of components that are
not continuously monitored”.
Select “Test-ID 01 ($01) ”.
– Select the desired “Component-ID (CID)” or “Hex-ID”.
– Check specified values at idle.
Component-ID DTC Component or System Min. Max. Additional Information
(CID)
(Hex-ID)
05 ($05) P0420 Conversion Capability --- >2 Refer to DTC P0420 in the
(storage) Check. OBD DTC Summary Table
For additional informa‐ for all monitoring values.
tion, refer to the Bosch ⇒ page 39 .
Motronic ME 5.9 OBD
System Strategy. Page 3.
07($07) P0420 Conversion Capability --- >2 Refer to DTC P0420 in the
(storage) Check. OBD DTC Summary Table
For additional informa‐ for all monitoring values.
tion, refer to the Bosch ⇒ page 39 .
Motronic ME 5.9 OBD
System Strategy. Page 3.
08($08) P0420 Conversion Capability --- >2 Refer to DTC P0420 in the
(storage) Check. For ad‐ OBD DTC Summary Table
ditional information, refer for all monitoring values.
to the Bosch Motronic ME ⇒ page 39 .
5.9 OBD System Strat‐
egy. Page 3.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “Mode 03: Interrogating Fault Mem‐
ory” to check for stored DTC's or the corresponding diagnostic
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.
TID 02 ($02): Oxygen Sensor Bank 1- Sensor 1
– Connect the scan tool.
– Start the engine and run at idle.
– Select “Mode 6: Check test the results of components that are
not continuously monitored”.
Select “Test-ID 02 ($02)”.
– Select the desired “Component-ID (CID)” or “Hex-ID”.
– Check specified values at idle.

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 A4 2002 ➤
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Component-ID DTC Component or System Min. Max. Additional Information

(CID)
(Hex-ID)
01($01) P0133 Response check. --- < 0.7 sec‐ Refer to DTC P0133 in the
For additional information, onds OBD DTC Summary Table.
refer to the Bosch Motron‐ ⇒ page 25 .
ic ME 5.9 OBD System
Strategy. Page 26.

– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “Mode 03: Interrogating Fault Mem‐
ory” to check for stored DTC's or the corresponding diagnostic
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.
TID 03 ($03): Secondary Air Injection (AIR) System
– Connect the scan tool.
– Start the engine and run at idle.
– Select “Mode 6: Check test the results of components that are
not continuously monitored”.
Select “Test-ID 03 ($03) ”.
– Select the desired “Component-ID (CID)” or “Hex-ID”.
– Check specified values at idle.
Component-ID DTC Component or System Min. Max. Additional Information
(CID)
(Hex-ID)
01 ($01) P0411 Secondary Air Injection --- 18% Refer to DTC P0411 in the
(AIR) System test. For OBD DTC Summary Table
additional information, re‐ for all monitoring values.
fer to the Bosch Motronic ⇒ page 38 .
ME 5.9 OBD System
Strategy. Page 19.
02 ($02) P0411 Secondary Air Injection --- 18% Refer to DTC P0411 in the
(AIR) System test. For OBD DTC Summary Table
additional information, re‐ for all monitoring values.
fer to the Bosch Motronic ⇒ page 38 .
ME 5.9 OBD System
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unlessStrategy.
authorised byPage
AUDI AG. 19.AUDI AG does not guarantee or accept any liability
09 ($09) P0411 Secondary Air Injection --- 18%
with respect to the correctness of information in this document. Copyright by AUDI AG.
Refer to DTC P0411 in the
(AIR) System test. For OBD DTC Summary Table
additional information, re‐ for all monitoring values.
fer to the Bosch Motronic ⇒ page 38 .
ME 5.9 OBD System
Strategy. Page 19.

– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “Mode 03: Interrogating Fault Mem‐
ory” to check for stored DTC's or the corresponding diagnostic
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.
TID $05 (05): Tank Ventilation System, Tank Vent Valve Function
– Connect the scan tool.

2. Diagnostic Modes 13
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Start the engine and run at idle.

– Select “Mode 6: Check test the results of components that are
not continuously monitored”.
Select “Test-ID 05($05)”.
– Select the desired “Component-ID (CID)” or “Hex-ID”.
– Check specified values at idle.
Component-ID DTC Component or System Min. Max. Additional Information
(CID)
(Hex-ID)
04 ($04) No DTC Tank Ventilation Valve 5-10% --- ---
Check.
05 ($05) No DTC Tank Ventilation Valve 5-10% --- ---
Check.
06 ($06) No DTC Tank Ventilation Valve 5-10% --- ---
Check.
07 ($07) P0441 Fuel Tank Leak Test. < 5.5% > 9.4 % Refer to DTC P0441 in the
For additional informa‐ OBD DTC Summary Table.
tion, refer to the Bosch ⇒ page 40 .
Motronic ME 5.9 OBD
System Strategy. Page
13.

– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “ModeProtected
03: Interrogating Fault
by copyright. Copying Mem‐
for private or commercial purposes, in part or in whole, is not

ory” to check for stored DTC's or the corresponding diagnostic

permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.
TID $05 (05): Tank Ventilation System, Tank Leak Test
– Connect the scan tool.
– Start the engine and run at idle.
– Select “Mode 6: Check test the results of components that are
not continuously monitored”.
Select “Test-ID 05 ($05)”.
– Select the desired “Component-ID (TID)” or “Hex-ID”.
– Check specified values at idle.
Component-ID DTC Component or System Min. Max. Additional Information
(CID)
(Hex-ID)
0D ($13) P0442 Pressure Check. Small leak --- <1.85-2.05 Refer to DTC P0442 in the
test. For additional informa‐ seconds OBD DTC Summary Ta‐
tion, refer to the Bosch Mo‐ ble. ⇒ page 41 .
tronic ME 5.9 OBD System
Strategy. Page 13.
0D ($13) P0455 Pressure Check. Large leak --- <0.95 sec‐ Refer to DTC P0455 in the
test. For additional informa‐ onds OBD DTC Summary Table
tion, refer to the Bosch Mo‐ ⇒ page 43 .
tronic ME 5.9 OBD System
Strategy. Page 13.

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 A4 2002 ➤
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Component-ID DTC Component or System Min. Max. Additional Information

(CID)
(Hex-ID)
11 ($17) P0456 Pressure Check. Pinhole --- <2.05-7 Refer to DTC P0456 in the
leak test. For additional in‐ seconds OBD DTC Summary Table
formation, refer to the Bosch ⇒ page 44 .
Motronic ME 5.9 OBD Sys‐
tem Strategy. Page 13.

– If any of components or systems fail to meet the specified val‐

ues. Refer to Diagnostic “Mode 03: Interrogating Fault Mem‐
ory” to check for stored DTC's or the corresponding diagnostic
repair procedure ⇒ page 6 .
– Switch the ignition off.
– End of diagnosis.

2.7 Diagnostic Mode 07 - Read Faults De‐

tected During the Current or Last Driving
Cycle
Mode 07 makes it possible to check emissions-related faults
which appeared during the current or last driving cycle (pending
DTCs).
A pending DTC is saved the first time a fault is detected (output
via Mode 07).
– If the fault is detected again by the end of the following driving
cycle, a confirmed DTC is entered (output via Mode 03) and
the MIL is activated.
– If this malfunction is not detected again by the end of the fol‐
lowing driving cycle, the corresponding pending code will be
deleted at the end of the driving cycle.

Note

Depending on scan tool and protocol used, some of the informa‐

tion provided may be referred to by a different name.

Procedure
– Connect the scan tool.
– Start the engine and run at idle.

Note

If the engine does not start, crank the engine using starter for at
least 5 seconds. Do not switch the ignition off afterward.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Select “Mode 7: Check test results of components that are
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
continuously monitored”. with respect to the correctness of information in this document. Copyright by AUDI AG.

The number of pending DTCs or “0 malfunctions detected” will be

displayed on the scan tool screen.
– Refer to the following DTC tables for the diagnostic repair pro‐
cedure:
♦ SAE P0xxx DTCs ⇒ “4.1 SAE P0xxx DTCs”, page 20 .
♦ SAE P1xxx DTCs ⇒ “4.2 SAE P1xxx DTCs”, page 51 .

2. Diagnostic Modes 15
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

♦ SAE P2xxx DTCs ⇒ “4.3 SAE P2xxx DTCs”, page 55 .

♦ SAE P3xxx DTCs ⇒ “4.4 SAE P3xxx DTCs”, page 59 .
– Switch the ignition off.

2.8 Diagnostic Mode 08 - Request Control

of On-Board System, Test or Compo‐
nent
Diagnostic Mode 08 is used to control the operation of an on-
board system, test or component. A Mode 8 service can be used
to turn on-board system ON or OFF, or to cycle an on-board sys‐
tem, test or component ON or OFF for a specific period of time.
The service can also be used to request system status or to report
test results.
Diagnostic Mode 08, TID $01
Diagnostic Mode 08, TID $01 is used to determine if the evapo‐
rative system may be leaking.

Note

If the accelerator pedal is depressed during the test, the test will
be aborted.

Test requirements
• No DTCs stored in the DTC memory.
• Intake Air Temperature (IAT) maximum 60 °C.
• Coolant temperature 80 -110 °C.
• Throttle valve angle 12.0 - 16.0%.
Procedure
– Connect the scan tool.
– Start the engine and run at idle for at least 15 minutes.
– Select “Mode 8: Tank Leak Test”.
– Select “OBDMID 01: Tank Leak Test”.
– Check the specified value of the tank leak test at idle.
– The following will be displayed on the scan tool screen:
Tank leak test Specified value
♦ Test function active Test OK
♦ Test function is being initiated, please
wait
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
♦ Test off permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Test aborted

– Switch the ignition off.

If the specified value is obtained:
– Refer to “Diagnostic mode 03: Interrogating fault memory ” to
check for any DTC's that may be stored ⇒ page 6 .
– To repeat the tank test, switch the ignition off and start the
engine again and let run for 15 minutes at idle.
– Switch the ignition off.

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 A4 2002 ➤
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– End of diagnosis.

2.9 Diagnostic Mode 09 - Read Vehicle In‐

formation
Diagnostic Mode 09 makes it possible to access vehicle-specific
information from the ECM and the TCM (where applicable).

Note

Depending on scan tool and protocol used, Diagnostic Mode 09

and the information provided may be referred to by a different
name.

Test requirement
• No DTC's stored in the DTC memory.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Procedure permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Connect the scan tool.
– Switch the ignition on.
– Select “Mode 09: Vehicle information”.
– Select the desired “OBDMID”.
– The information requested will be displayed on the scan tool
screen.
The following table is a numerical list of all“OBDMIDs” that may
be selected.
OBDMID Diagnostic text
02: Vehicle identification number e.g.
♦ A different 17 digit number will be displayed for
each vehicle

04: Calibration identification e.g.

♦ Engine Control Module (ECM)

♦ Transmission Control Module (TCM)

06: CVN (check sum) e.g.

♦ EC5AE460 the check sum is different for every
control module version

♦ 000D105

– Switch the ignition off.

– End of diagnosis.

2. Diagnostic Modes 17
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

3 Readiness Code
Diagnostics are performed at regular intervals during normal ve‐
hicle operation. After repairing an emissions related system, a
readiness code is generated by road testing the vehicle.
If a malfunction is recognized during the drive cycle, it will be
stored in the DTC memory.
The OBD drive cycle operation will be monitored with a hand held
diagnostic tool. Consult the manufacturer's instruction manual for
correct tool operation.
The readiness code is erased every time the DTC memory is
erased or any time the battery is disconnected. If the DTC mem‐
ory has been erased or the battery is disconnected, a new read‐
iness code must be generated.
Only erase the DTC memory if a DTC has been stored.
General Recommendations
Most monitors will complete easier and quicker using a “steady-
foot” and “smooth”
Protected acceleration
by copyright. during
Copying for private the drive
or commercial cycle
purposes, operation,
in part or in whole, is not
cruise, permitted
and acceleration modes.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Operating Conditions
For the EVAP monitor test, the coolant temperature and the am‐
bient air temperature must be between 10° C and 35° C with a
difference between them no greater than 4° C. The ambient air
temperature must not change more than 4° C during the drive
cycle procedure (e.g. when driving out of a heated workshop in
the winter).
Test requirements
• Erase the DTC memory ⇒ page 8 .
• Coolant temperature must be between 80° C - 110° C.
• The Intake Air Temperature (IAT) must be between 10° C - 35°
C.
• Battery voltage must be a minimum of 12.5 volts.
• Fuel tank level 1/4 - 3/4 full.

WARNING

When performing the drive cycle operation, pay strict attention

to driving conditions and please observe and obey all posted
speed limits. Failure to follow these instructions may result in
personal injury or possible death.

Drive Cycle Procedure

– Connect the scan tool.
– Switch the ignition on and start the vehicle.
– Idle the vehicle for 2-3 minutes. This executes the O2S Heater,
Misfire, Secondary AIR, Fuel Trim, and Purge system moni‐
tors.
– Drive the vehicle at 45-55 mph for a continuous 7 minute pe‐
riod, avoid stopping. This executes the EVAP, O2S, Fuel Trim,
and Misfire monitors.
– Accelerate the vehicle to an engine speed of 5000 RPM (with
automatic transmission use the tip-tronic mode); lift off the

18 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

throttle until the engine speed is around 1200 rpm. This exe‐
cutes the fuel cut off
– Accelerate the vehicle smoothly to 60-65 mph, cruise con‐
stantly for 5 min, this executes the Catalyst; O2S, Misfire, Fuel
Trim, and Purge System monitors.
– Decelerate and idle the vehicle again for 3 minutes. This ex‐
ecutes the Misfire, Secondary AIR, Fuel Trim, and Purge
system monitors.
– Check the status of the readiness code.

Note

Depending on the scan tool used. The readiness code status may
be displayed as complete, passed or OK.

– If any engine monitor fails the drive cycle test. Repeat the drive
cycle test until all engine monitors have successfully run
through and passed.

Note

When repeating the drive cycle operation for a failed EVAP mon‐
itor or thermostat-monitor, allow the engine to cool until the cool‐
ant temperature and the ambient air temperature are be between
10° C - 35° C with a difference between them no greater than 4°
C is observed and repeat the drive cycle operation.

If the drive cycle operation fails again.

– Check the DTC memory for stored DTC's ⇒ page 6 .
Repair the vehicle if necessary.
– Repeat the drive cycle operation until all engine monitors have
successfully run through and passed.
– Remove the scan tool and switch the ignition off.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– End permitted
of operation.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3. Readiness Code 19
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

4 DTC Tables
⇒ “4.1 SAE P0xxx DTCs”, page 20
⇒ “4.2 SAE P1xxx DTCs”, page 51
⇒ “4.3 SAE P2xxx DTCs”, page 55
⇒ “4.4 SAE P3xxx DTCs”, page 59

4.1 SAE P0xxx DTCs

Fuel and air ratios

Refer to: ⇒ Bosch Motronic ME 7 OBD System Strategy; Com‐

prehensive Components Monitoring
DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency
Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0010 “A” – Check the Camshaft Short to Engine speed- 80 0.5 Sec • 2 DCY
Cam‐ Adjustment Valve 1 - battery rpm
shaft N205- . Refer to positive-
Position ⇒ page 149 . >5.2 – 6.0
Actuator V Short
Protected by copyright. Copying to or commercial purposes, in part or in whole, is not
for private
Circuit ground-
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
<0.5 – 1.0
V Open
circuit-
<5.0 – 8.8
mA
P0011 “A” – Check the Camshaft Adjust‐ Engine speed->520 1.0 sec • 2 DCY
Cam‐ Adjustment Valve 1 - ment an‐ rpm ECT->(-)44 - per
shaft N205- . Refer to gle->6 de‐ 143 degrees C Time driving
Position ⇒ page 149 . grees after engine start-0 cycle
– Timing sec
Over-
Ad‐
vanced
or Sys‐
tem Per‐
for‐
mance
P0012 “A” – Check the Camshaft Adjust‐ Engine speed->720 1.5 sec 2 driving cycles
Cam‐ Adjustment Valve 1 - ment an‐ rpm ECT->(-)9.75
shaft N205- . Refer to gle-<16 degrees C Time after
Position ⇒ page 149 . degrees engine start->10 sec
– Timing
Over-
Retar‐
ded
P0030 HO2 – Check the Oxygen Open cir‐ Sensor heater-OFF 0.5 Sec • 2 DCY
Heater Sensor (O2S) Heater - cuit-2.34 – Time after engine
Control Z19- . Refer to 3.59 V start->4 sec
Circuit ⇒ page 96 . Sensor heater-Heat‐
(Bank 1, ed up
Sensor
1)

20 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0031 HO2 – Check the Oxygen Short to Sensor heater- OFF 5 Sec • 2 DCY
Heater Sensor (O2S) Heater - ground < Time after engine
Control Z19- . Refer to 2.34V start- >4 sec
Circuit ⇒ page 96 . Sensor heater-Heat‐
Low ed up
(Bank 1,
Sensor
1)
P0032 HO2 – Check the Oxygen Short to Sensor heater-ON 5 Sec • 2 DCY
Heater Sensor (O2S) Heater - battery Air mass flow-> 32
Control Z19- . Refer to positive-< kg/h Sensor heater-
Circuit ⇒ page 96 . 1% Heated up
High
(Bank 1,
Sensor Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
1) permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
P0036 HO2S – Check the Oxygen Open cir‐ Sensor heater-OFF 0.5 Sec • 2 DCY
Heater Sensor (O2S) Heater - cuit-4.5 – Engine speed->80
Control Z29- . Refer to 5.5 V rpm
Circuit ⇒ page 98 .
(Bank 1,
Sensor
2), elec‐
trical
fault.
P0037 HO2S – Check the Oxygen Short to Sensor heater-OFF 5 Sec • 2 DCY
Heater Sensor (O2S) Heater - ground- Engine speed- >80
Control Z29- . Refer to <3.0 V rpm
Circuit ⇒ page 98 .
Low
(Bank 1,
Sensor
2), elec‐
trical
fault.
P0038 HO2S – Check the Oxygen Short to Sensor heater-ON 0.5 Sec • 2 DCY
Heater Sensor (O2S) Heater - Battery Engine speed->80
Control Z29- . Refer to Positive rpm
Circuit ⇒ page 98 . 2.7 – 5.5 A
High
(Bank 1,
Sensor
2), elec‐
trical
fault.
P0102 Mass or – Check the Mass Air Lower Time after engine 2 Sec • 2 DCY
Volume Flow (MAF) Sensor - threshold start-200 camshaft
Air Flow G70- . Refer to map (de‐ revolutions
Circuit ⇒ page 101 . pending
Low In‐ on engine
put speed and
throttle an‐
gle)
Air mass:
<3 – 159
kg/h

4. DTC Tables 21
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0103 Mass or – Check the Mass Air (ULEV) Time after engine 2 Sec • 2 DCY
Volume Flow (MAF) Sensor - Upper start-200 camshaft
Air Flow G70- . Refer to threshold revolutions
Circuit ⇒ page 101 . map (de‐
High In‐ pending
put on engine
speed and
throttle an‐
gle)
Air mass:
<50 – 710
kg/h
P0106 Manifold – Check the Charge Air Difference --- --- • 2 DCY
Abso‐ Pressure Sensor - between
lute G31- . Refer to altitude
Pres‐ ⇒ page 90 . sensor
sure/ and boost
Baro‐ pressure -
metric >200 mbar
Pres‐
sure Cir‐
cuit
Range/
Per‐
for‐ Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
mance permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
P0112 Intake – Check the Intake Air Short to Engine cranking 2 Sec • 2 DCY
Air Tem‐ Temperature (IAT) ground range-120 – 320 rpm
perature Sensor 2 -G299- 141.0 de‐
Sensor grees C
1 Circuit . Refer to ⇒ page 111 .
Low
P0113 Intake – Check the Intake Air Short to Time after engine 2 Sec • 2 DCY
Air Tem‐ Temperature (IAT) battery start-180 sec
perature Sensor 2 -G299- positive <
Sensor (-) 45.75
1 Circuit . Refer to ⇒ page 111 . degrees C
High

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 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0116 Engine – Check the Engine (LEV)Sig‐ Engine temperature- >25 2 driving cycles
Coolant Coolant Temperature nal >105 degrees C sec‐ 2 driving cycles
Temper‐ (ECT) Sensor -G62- . change<3 Engine heated up: onds/
ature Refer to ⇒ page 107 . K Vehicle speed once
Sensor K(ULEV) range-0 – 80 mph per
Circuit – Check the coolant reg‐ Signal Mass air flow->40 – driving
Range/ ulator. Refer to Engine range-<3 52 kg/h (depending cycle
Per‐ Mechanical Repair K on speed) 25 sec‐
for‐ Manual. Time required/freq.- onds
mance >10 sec/once
and
Engine cooling
down:
Vehicle speed
range-40 – 80 mph
mass air flow-<28 –
52 kg/h (depending
on speed)
Time required/freq.-
>15 sec/once
Engine temperature-
>112.5 degrees C
Engine heated up:
Vehicle speed
range-0 – 80 mph
Mass air flow->40 –
52 kg/h (depending
on speed)
Time required/freq.-
>10 sec/once
and
Engine cooling
down:
Vehicle speed
range-25 – 80 mph
mass air flow-<28 –
52 kg/h (depending
on speed)
Time required/freq.-
>15 sec/once
P0117 Engine – Check the Engine (LEV) — 2 Sec • 2 DCY
Coolant Coolant Temperature Short to
Temper‐ (ECT) Sensor -G62- . ground
ature Refer to ⇒ page 107 . ECT, >141
Circuit °C
Low – Check the coolant reg‐ (ULEV)
ulator. Refer to Engine Short to
Mechanical Repair ground
Manual. ECT, >141
°C

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 23
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0118 Engine – Check the Engine (LEV) — 2 sec • 2 DCY
Coolant Coolant Temperature Short to 2 sec
Temper‐ (ECT) Sensor -G62- . battery
ature Refer to ⇒ page 107 . positive or
Circuit open cir‐
High – Check the coolant reg‐ cuit- <(-)
ulator. Refer to Engine 45.75 de‐
Mechanical Repair grees C
Manual. (ULEV)
Short to
battery
positive- <
(-) 45.75
degrees C
P0121 Throttle/ – Protected
Checkby the Throttle
copyright. CopyingPo‐ Notorplausi‐
for private commercialEngine
purposes, speed- 0.2 Sec •
in part or in whole, is not 2 DCY
Pedal sition unless
permitted (TP)authorised
Sensorby- AUDI AG. bleAUDI
signal:
AG does>1,320 rpm
not guarantee or accept any liability
Position G79- / Accelerator
with respect Compari‐
to the correctness of information in this document. Copyright by AUDI AG.
Sensor Pedal Position Sensor son signal
A Circuit 2 -G185- . Refer to sensor –
Range/ ⇒ page 77 . vs- signal
Per‐ senor 2
for‐ and differ‐
mance ence be‐
tween sig‐
nal 1 to
calculated
throttle an‐
gle > dif‐
ference
between
signal 2 to
calculated
throttle an‐
gle->6.3%
P0122 Throttle/ – Check the Throttle Po‐ Lower — 0.14 • 2 DCY
Pedal sition (TP) Sensor - threshold- Sec
Position G79- / Accelerator <0.18 V
Sensor Pedal Position Sensor
“A” Cir‐ 2 -G185- . Refer to
cuit Low ⇒ page 77 .
Input
P0123 Throttle/ – Check the Throttle Po‐ Upper — 0.14 • 2 DCY
Pedal sition (TP) Sensor - threshold Sec
Position G79- / Accelerator > 4.63 V
Sensor Pedal Position Sensor
“A” Cir‐ 2 -G185- . Refer to
cuit High ⇒ page 77 .
Input

24 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0130 O2 Sen‐ – Check the Heated Oxy‐ Gradient Time after engine 0.13 • 2 DCY
sor Cir‐ gen Sensor (HO2S) - of O2 sen‐ start, >25 Sec sec‐
cuit G39- . Refer to sor signal, Exhaust gas temp, onds
(Bank 1, ⇒ pageby 122
Protected . Copying for private
copyright. 2 V/msor commercial>200° C in part or in whole, is5-25
purposes, not
Sensor permitted unless authorised by AUDIOpen AG. AUDIcir‐
AG does Load change,
not guarantee <3%
or accept sec‐
any liability
1) Mal‐ cuit or no
with respect to the correctness of information segment
in this document. Copyright by AUDI AG.onds
function activity, Sensor heater, ac‐ 10 sec‐
Front O2 tive, onds at
sensed l Sensor, heated up low fuel
0.995-1.00 Time after engine level:
5 start, >25 Sec 6-10
Internal Air mass flow, >24 Sec
voltage kg/h 2 sec
high Rear o2 signal, >0.7 2-25
(ASIC) or <0.3 V sec
<3.7-<4.8 Fuel cut off, not ac‐
V tive
Internal Oxygen sensor,
voltage heated up
high Fuel cut off, not ac‐
(ASIC) tiveOxygen sensor,
>4.8 V heated up
Compari‐ l control, closed loop
son signal
front to
rear sen‐
sor, Front
O2 sensed
lean l>1.04
and rear
O2 signal
>0.7 V
Or
Front O2
sensed
rich l <0.96
and rear
O2 signal
>0.3 V
P0133 O2 Sen‐ – Check the Heated Oxy‐ Amplitude Engine speed 40 sec, • 2 DCY
sor Cir‐ gen Sensor (HO2S) - ration be‐ range-1,720 – 3,500 once
cuit G39- . Refer to tween sen‐ rpm per
Slow ⇒ page 122 . sor signal Engine load driving
Re‐ and stored range-33 – 52% cycle
sponse value-<0.7 Load change-<4%/
(Bank 1, segment
Sensor Fuel control-Closed
1) loop
P0135 O2 Sen‐ – Check the Oxygen No activity Sensor heater-ON 20 sec, • 2 DCY
sor Sensor (O2S) Heater - after en‐ Air mass flow->32 once
Heater Z19- . Refer to gine start- kg/h per
Circuit ⇒ page 96 . <1% Sensor heater-Heat‐ driving
No activity ed up cycle
after fuel Time after engine 3 sec
cut off- start->70 sec
FRONT o2 Sensor heater-ON
sensor Catalyst tempera‐
voltage-. ture-300° C
<3V P0133-No fault

4. DTC Tables 25
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0136 O2 Sen‐ – Check the Oxygen (LEV) Sensor heated up- 600 • 2 DCY
sor Cir‐ Sensor (O2S) Behind Open cir‐ After 100 sec Sec
cuit Three Way Catalytic cuit- Catalyst tempera‐
(Bank 1, Converter (TWC) - 400 – 500 ture-> 50° C
Sensor G130- . Refer to mV
2) ⇒ page 124 .
P0137 O2 Sen‐ – Check the Oxygen (ULEV) Sensor heated up- 100 • 2 DCY
sor Cir‐ Sensor (O2S) Behind Short cir‐ After 100 sec Cata‐ sec at
cuit Low Three Way Catalytic cuit- lyst temperature- low fuel
Voltage Converter (TWC) - <60 mV >320° C level:
(Bank 1, G130- . Refer to (LEV) Engine temperature 700
Sensor ⇒ page 124 . Short cir‐ @ engine OFF- >60° sec
2) cuit C 90 Sec
< 60mV Engine temperature at low
@ engine start- <40° fuel
C level:
Sensor heated up- 700.
After 100 sec Cata‐ Sec
lyst temperature-
>320°
Protected by C
copyright. Copying for private or commercial purposes, in part or in whole, is not
Engine
permitted temperature
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
@
with engine OFF-
respect to the >60°of information in this document. Copyright by AUDI AG.
correctness
C
Engine temperature
@ engine start- <40°
C
P0138 O2 Cir‐ – Check the Oxygen (ULEV) Sensor heated up- 5 Sec • 2 DCY
cuit High Sensor (O2S) Behind Short to After 100 sec. Cata‐
Voltage Three Way Catalytic battery lyst temperature-
(Bank 1, Converter (TWC) - +>1.3 V >320° C
Sensor G130- . Refer to (LEV) Sensor heated up-
2) ⇒ page 124 . Short to After 100 sec. Cata‐
battery +> lyst temperature-
1.3 V >50° C
P0139 O2 Sen‐ – Check the Oxygen (ULEV) Intake air mass-24 – 100 • 2 DCY
sor Cir‐ Sensor (O2S) Behind Sensor 120kg/h Sec
cuit Three Way Catalytic signal not Rear O2 sensor 100
Slow Converter (TWC) - active-Sig‐ readiness- >30 sec Sec
Re‐ G130- . Refer to nal output Rear o2 sensor heat‐
sponse ⇒ page 124 . is oscillat‐ er and electrical
(Bank 1, ing at ref‐ check-No DTC
Sensor erence Catalyst tempera‐
2) value ture->390° C
0.608 V Fuel cut off-Not ac‐
(LEV)Sig‐ tive
nal output Intake air mass-20 –
is oscillat‐ 120kg/h
ing at ref‐ Rear O2 sensor
erence readiness- >30 sec
value Rear o2 sensor heat‐
0.608 V er and electrical
check-No DTC
Catalyst tempera‐
ture- >375° C
Fuel cut off-Not ac‐
tive

26 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0140 O2 Sen‐ – Check the Oxygen ULEV) Sensor heated up- 600 • 2 DCY
sor Cir‐ Sensor (O2S) Behind Open sen‐ After 100 sec Sec
cuit No Three Way Catalytic sor or no Catalyst tempera‐ 600
Activity Converter (TWC) - activi‐ ture- 320° C Sec
Detec‐ G130- . Refer to ty-400 – Sensor heated up-
ted ⇒ page 124 . 500 mV After 100 sec
(Bank 1, (LEV) Catalyst tempera‐
Sensor no activi‐ ture- >50° C
2) ty-400 –
500 mV
P0141 O2 Sen‐ – Check the Oxygen (ULEV) Catalyst tempera‐ 6 Sec • 2 DCY
sor Sensor (O2S) Heater - Out of ture,400-580° C 30 Sec
Heater Z29- . Refer to range, Sensor heater, on
Circuit ⇒ page 98 . 0.5-38 Ω Sensor heater, heat‐
(Bank 1, (Depend‐ ed up
Sensor ing on cat‐ IAT, >-7° C
2), elec‐ alyst Catalyst tempera‐
trical temp.) ture,300-600° C
fault. (LEV) Sensor heater, on
Out of Sensor heater, heat‐
range, ed up
0.8-30 Ω IAT, >-7° C
(Depend‐
ing on cat‐
alyst
temp.)

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 27
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0171 System – Check the fuel pump (additive) Lambda controller- 50 Sec • 2 DCY
Too delivery and quantity . System Closed loop 50 Sec
Lean Refer to ⇒ page 63 . too RICH- Engine speed-
>(-) 8% <1,000 rpm
– Check the Fuel Pres‐
Protected within Mass
by copyright. Copying air-<22
for private kg/h purposes, in part or in whole, is not
or commercial
sure Sensor -G247- . adaptive
permitted unless authorisedFuel
by AUDIadoption-Active
AG. AUDI AG does not guarantee or accept any liability
range
with respect and ofstable
to the correctness information in this document. Copyright by AUDI AG.
– Check the fuel injectors (multipli‐ Purge valve-
-N30, N31, N32, N33, cative) CLOSED
N83- . Refer to System ULEV: ECT or subst.
⇒ page 118 . too RICH- Temperature->70 or
> (-)23% >80° C
– Check the Heated Oxy‐ within LEV: ECT or subst.
gen Sensor (HO2S) - adaptive Temperature->60 –
G39- Refer to range 70° C
⇒ page 122 . Lambda controller
engine-
– Check the Oxygen CLOSED loop
Sensor (O2S) Behind Engine load-12 – 60
Three Way Catalytic %
Converter (TWC) - Mass air-34 – 450 kg/
G130- . Refer to h
⇒ page 96 . Fuel adoption-Active
and stable
– Check the Evaporative Purge valve-
Emission (EVAP) Can‐ CLOSED
ister Purge Regulator Engine speed-0 –
Valve -N80- . Refer to 4,800 U/min
⇒ page 70 . ULEV: ECT or subst.
Temperature->70 or
– Check the intake sys‐ >80° C
tem for leaks (false LEV: ECT or subst.
air) . Temperature->60 –
70° C
– Check the exhaust sys‐
tem for proper seal .

– Check the vacuum

lines for leaks

28 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
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DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0172 System – Check the Fuel Pres‐ (additive) Lambda controller- 50 Sec • 2 DCY
Too sure Sensor -G247- . System Closed loop 50 Sec
Rich too RICH- Engine speed-
– Check the fuel injectors >(-) 8% <1,000 rpm
-N30, N31, N32, N33, within Mass air-<22 kg/h
N83- . Refer to adaptive Fuel adoption-Active
⇒ page 118 . range and stable
(multipli‐ Purge valve-
– Check the Heated Oxy‐ cative) CLOSED
gen Sensor (HO2S) - System ULEV: ECT or subst.
G39- . Refer to too RICH- Temperature->70 or
⇒ page 122 . > (-)23% >80° C
within LEV: ECT or subst.
– Check the Oxygen adaptive Temperature->60 –
Sensor (O2S) Behind range 70° C
Three Way Catalytic Lambda controller
Converter (TWC) - engine-
G130- . Refer to CLOSED loop
⇒ page 124 . Engine load-12 – 60
%
– Check the Evaporative Mass air-34 – 450 kg/
Emission (EVAP) Can‐ h
ister Purge Regulator Fuel adoption-Active
Valve -N80- . Refer to and stable
⇒ page 70 . Purge valve-
CLOSED
Engine speed-0 –
4,800
Protected by copyright. CopyingU/min
for private or commercial purposes, in part or in whole, is not
ULEV:byECT
permitted unless authorised AUDI AG. or AUDI
subst.AG does not guarantee or accept any liability
with respect to theTemperature->70
correctness of information or
in this document. Copyright by AUDI AG.
>80° C
LEV: ECT or subst.
Temperature->60 –
70° C
P0201 Injector – Check the fuel injectors Open cir‐ Engine speed-80 0.5 Sec • 2 DCY
Circuit / -N30- . Refer to cuit-4.5 – rpm
Open - ⇒ page 118 . 5.5 V while
Cylinder injection
1 valve is
OFF
P0202 Injector – Check the fuel injectors Open cir‐ Engine speed-80 +0.5 • 2 DCY
Circuit / -N31- . Refer to cuit-4.5 – rpm Sec
Open - ⇒ page 118 . 5.5 V while
Cylinder injection
2 valve is
OFF
P0203 Injector – Check the fuel injectors Open cir‐ Engine speed-80 +0.5 • 2 DCY
Circuit / -N32- . Refer to cuit-4.5 – rpm Sec
Open - ⇒ page 118 . 5.5 V while
Cylinder injection
3 valve is
OFF
P0204 Injector – Check the fuel injectors Open cir‐ Engine speed-80 +0.5 • 2 DCY
Circuit / -N33- . Refer to cuit-4.5 – rpm Sec
Open - ⇒ page 118 . 5.5 V while
Cylinder injection
4 valve is
OFF

4. DTC Tables 29
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0221 Throttle/ – Check the Throttle Po‐ Not plausi‐ Engine speed- 0.2 Sec • 2 DCY
Pedal sition (TP) Sensor - ble signal: >1,320 rpm
Position G79- / Accelerator Compari‐
Sensor/ Pedal Position Sensor son signal
Switch B 2 -G185- . Refer to sensor 2 –
Circuit ⇒ page 77 . vs- signal
Range/ sensor 1
Per‐ and differ‐
for‐ ence be‐
mance tween sig‐
nal 2 to
calculated
throttle an‐
gle > dif‐
ference
between
signal 1 to
calculated
throttle an‐
gle- >6.3%
P0222 Throttle/ – Check the Throttle Po‐ Lower Engine speed- 0.14 • 2 DCY
Pedal sition (TP) Sensor - thresh‐ >1,320 rpm Sec
Position G79- / Accelerator old-0.16 V
Sensor/ Pedal Position Sensor
Switch B 2 -G185- . Refer to
Circuit ⇒ page 77 .
Low
P0223 Throttle/ – Check the Throttle Po‐ Upper — 0.14 • 2 DCY
Pedal sition (TP) Sensor - thresh‐ Sec
Position G79- / Accelerator old-4.8 V
Sensor/ Pedal Position Sensor
Switch B 2 -G185- . Refer to
Circuit ⇒ page 77 .
High
P0230 Fuel – Check Fuel Delivery Short to Engine speed- >80 0.5 Sec • 2 DCY
Pump System
Protected battery
by copyright. Copying for private or commercial purposes, Rpm
in part or in whole, is not
primary permitted unless authorised by AUDI positive-
AG. AUDI AG does not guarantee or accept any liability
Circuit ⇒ page 63 0.6 – 1.2 A
with respect to the correctness of information in this document. Copyright by AUDI AG.

Short to
ground-
<3.0 V
Open cir‐
cuit-4.5 –
5.5 V
P0234 Turbo‐ – Check the Charge Air (Only Engine speed- 1.0 Sec • 2 DCY
charger/ Pressure Sensor - ULEV) >2,400 - 3,000 Rpm
Super‐ G31- . Refer to Actual
charger ⇒ page 90 . pressure
Over‐ higher
boost – Check the charge air than mod‐
Condi‐ system for proper seal. el pres‐
tion Refer to Engine Me‐ sure-400
chanical Repair Man‐ mbar
ual.

30 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0237 Turbo‐ – Check the Charge Air Short to — 0.8 Sec • 2 DCY
charger/ Pressure Sensor - ground-
Super‐ G31- . Refer to >0.14 V
charger ⇒ page 90 .
Boost
Sensor“ – Check the charge air
A” system for proper seal.
Range / Refer to Engine Me‐
Per‐ chanical Repair Man‐
for‐ ual.
mance
P0238 Turbo‐ – Check the Charge Air Short to --- 0.8 Sec • 2 DCY
charger/ Pressure Sensor - battery
Super‐ G31- . Refer to positive-
charger ⇒ page 90 . >4.88 V
Boost
Sensor“ – Check the charge air
A” Cir‐ system for proper seal.
cuit High Refer to Engine Me‐
chanical Repair Man‐
ual.
P0243 Turbo‐ – Check the Wastegate (Only Valve-OFF 0.5 Sec • 2 DCY
charger/ Bypass Regulator ULEV) Engine speed->80
Super‐ Valve -N75- . Refer to Open cir‐ rpm
charger ⇒ page 85 . cuit-
Waste‐ 4.5 – 5.5 V
gate
Sole‐
noid “A”
P0245 Turbo‐ – Check the Wastegate (Only Valve-ON 0.5 Sec • 2 DCY
charger/ Bypass Regulator ULEV) Engine speed->80
Super‐ Valve -N75- . Refer to Short to rpm
charger ⇒ page 85 . ground-
Waste‐ <3.0 V
gate
Sole‐
noid “A”
Low
P0246 Turbo‐ – Check the Wastegate Only Valve-OFF 0.5 Sec • 2 DCY
charger/ Bypass Regulator ULEV) Engine speed->80
Super‐ Valve -N75- . Refer to Short to rpm
charger
Protected by copyright. ⇒ page
Copying for private 85 . purposes, in part orbattery
or commercial in whole, is not
Waste‐by AUDI AG. AUDI AG does not guarantee or accept
permitted unless authorised posi‐any liability
gate
with respect to the correctness of information in this document. Copyrighttive-2.2
by AUDI AG. –
Sole‐ 4.0 A
noid “A”
High
P0261 Cylinder – Check the fuel injectors Short to Engine speed-80 0.5 Sec • 2 DCY
1 Injec‐ -N30- . Refer to ground- rpm
tor Cir‐ ⇒ page 118 . <3.0 V
cuit Low while in‐
jection
valve is
OFF

4. DTC Tables 31
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0262 Cylinder – Check the fuel injectors Short to Engine speed-> 80 0.5 Sec • 2 DCY
1 Injec‐ -N30- . Refer to battery rpm
tor Cir‐ ⇒ page 118 . positive-
cuit High 2.2 – 4.0 A
while in‐ by AUDI AG. AUDI AG does not guarantee or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised
jection
with respect to the correctness of information in this document. Copyright by AUDI AG.
pump is
ON
P0264 Cylinder – Check the fuel injectors Short to Engine speed-80 0.5 Sec • 2 DCY
2 Injec‐ -N31- . Refer to ground rpm
tor Cir‐ ⇒ page 118 . <3.0 V
cuit Low while in‐
jection
valve is
OFF
P0265 Cylinder – Check the fuel injectors Short to Engine speed-80 0.5 Sec • 2 DCY
2 Injec‐ -N31- . Refer to battery rpm
tor Cir‐ ⇒ page 118 . positive-
cuit High 2.2 – 4.0
Amps
while in‐
jection
pump is
ON
P0267 Cylinder – Check the fuel injectors Short to Engine speed-80 0.5 Sec • 2 DCY
3 Injec‐ -N32- . Refer to ground- rpm
tor Cir‐ ⇒ page 118 . <3.0 Volts
cuit Low while in‐
jection
valve is
OFF
P0268 Cylinder – Check the fuel injectors Short to Engine speed-> 80 0.5 Sec • 2 DCY
3 Injec‐ -N32- . Refer to battery rpm
tor Cir‐ ⇒ page 118 . positive-
cuit High 2.2 – 4.0 A
while in‐
jection
pump is
ON
P0270 Cylinder – Check the fuel injectors Short to Engine speed- 80 0.5 Sec • 2 DCY
4 Injec‐ -N33- . Refer to ground- rpm
tor Cir‐ ⇒ page 118 . <3.0 V
cuit Low while in‐
jection
valve is
OFF
P0271 Cylinder – Check the fuel injectors Short to Engine speed- > 80 0.5 Sec • 2 DCY
4 Injec‐ -N33- . Refer to battery rpm
tor Cir‐ ⇒ page 118 . positive-
cuit High 2.2 – 4.0 A
while in‐
jection
pump is
ON

32 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunc‐ Secondary Parame‐ Moni‐ Frequency

Mes‐ tion Crite‐ ters toring of
sage ria with Enable Condi‐ Time checks,
and tions Length MIL
Threshold Illum
Value
P0299 Turbo‐ – Check the charge air (Only Engine speed- 1 Sec • 2 DCY
charger/ system for proper seal. ULEV) >2,400 – 3,000 Rpm
Super‐ Refer to Engine Me‐ Actual Target charge->p
charger chanical Repair Man‐ pressure amb (+)450 hPa
Under‐ ual. lower than
boost model
pres‐
sure-200
mbar

Ignition system
DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Pa‐ Monitoring Frequency
sage cedure and Threshold Val‐ rameters Time of
ue with Enable Condi‐ Length checks,
tions MIL
Illum
P030 Random/ – Check the Multiple misfire, Time for engine --- • 2 DCY
0 Multiple Spark plugs. First 1,000 Revs- start-Idle – 1,500
Cylinder 1 time threshold rpm(+) 1 camshaft
Misfire De‐ – Check the in‐ Subsequent inter‐ revolution
tected take system vals- 4 times
for leaks. thresholds

– Check the fuel

pressure. Re‐
fer to
⇒ page 63 .

– Check fuel in‐

jectors -N30,
N31, N32,
N33, N83- .
– Check the Ig‐
nition Coils
with Power
Output Stage
-N70, N127,
N291, N292- .
Refer to
⇒ page 155 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 33
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Pa‐ Monitoring Frequency
sage cedure and Threshold Val‐ rameters Time of
ue with Enable Condi‐ Length checks,
tions MIL
Illum
P030 Cylinder 1 – Check the Emission thresh‐ Engine speed • 1000 • 2 DCY
1 Misfire De‐ Spark plugs. old- range- Rev.
tected (ULEV) >1.7% Idle – 6,560 Rpm • immed
– Check the in‐ (LEV) 2.5% Engine torque- • 200
take system Catalyst damage >0 Nm Rev.
for leaks. percent misfire- Fuel cut off-
(ULEV) >3 – 21% Not active
– Check the fuel (LEV front) >5 – Shift command-
pressure. Re‐ 27% No signal
fer to (LEV Quattro) (ONLY NEW BEE‐
⇒ page 63 . >6 – 39% TLE AT)
ECT->20°
– Check fuel in‐ (if ECTS <(-) 7°)
jectors -N30,
N31, N32,
N33, N83- .

– Check the Ig‐

nition Coils Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
with Power permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Output Stage with respect to the correctness of information in this document. Copyright by AUDI AG.
-N70, N127,
N291, N292- .
Refer to
⇒ page 155 .
P030 Cylinder 2 – Check the Emission thresh‐ Engine speed • 1000 • 2 DCY
2 Misfire De‐ Spark plugs. old- range- Rev.
tected (ULEV) >1.7% Idle – 6,560 Rpm • immed
– Check the in‐ (LEV) 2.5% Engine torque- • 200
take system Catalyst damage >0 Nm Rev.
for leaks. percent misfire- Fuel cut off-
(ULEV) >3 – 21% Not active
– Check the fuel (LEV front) >5 – Shift command-
pressure. Re‐ 27% No signal
fer to (LEV Quattro) (ONLY NEW BEE‐
⇒ page 63 . >6 – 39% TLE AT)
ECT->20°
– Check fuel in‐ (if ECTS <(-) 7°)
jectors -N30,
N31, N32,
N33, N83- .

– Check the Ig‐

nition Coils
with Power
Output Stage
-N70, N127,
N291, N292- .
Refer to
⇒ page 155 .

34 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Pa‐ Monitoring Frequency
sage cedure and Threshold Val‐ rameters Time of
ue with Enable Condi‐ Length checks,
tions MIL
Illum
P030 Cylinder 3 – Check the Emission thresh‐ Engine speed • 1000 • 2 DCY
3 Misfire De‐ Spark plugs. old- range- Rev.
tected (ULEV) >1.7% Idle – 6,560 Rpm • immed
– Check the in‐ (LEV) 2.5% Engine torque- • 200
take system Catalyst damage >0 Nm Rev.
for leaks. percent misfire- Fuel cut off-
(ULEV) >3 – 21% Not active
– Check the fuel (LEV front) >5 – Shift command-
pressure. Re‐ 27% No signal
fer to (LEV Quattro) (ONLY NEW BEE‐
⇒ page 63 . >6 – 39% TLE AT)
ECT->20°
– Check fuel in‐ (if ECTS <(-) 7°)
jectors -N30,
N31, N32,
N33, N83- .

– Check the Ig‐

nition Coils
with Power
Output Stage
-N70, N127,
N291, N292- .
Refer to
⇒ page 155 .
P030 Cylinder 4 – Check the Emission thresh‐ Engine speed • 1000 • 2 DCY
4 Misfire De‐ Protected
Sparkbyplugs. old- for private or commercialrange-
copyright. Copying Rev.
purposes, in part or in whole, is not
tected (ULEV)
permitted unless authorised by AUDI>1.7%
AG. AUDI AG doesIdle – 6,560
not guarantee Rpmany liability
or accept • immed
– Check the in‐ (LEV) 2.5% Engine torque-
with respect to the correctness of information in this document. Copyright by AUDI AG.• 200
take system Catalyst damage >0 Nm Rev.
for leaks. percent misfire- Fuel cut off-
(ULEV) >3 – 21% Not active
– Check the fuel (LEV front) >5 – Shift command-
pressure. Re‐ 27% No signal
fer to (LEV Quattro) (ONLY NEW BEE‐
⇒ page 63 . >6 – 39% TLE AT)
ECT->20°
– Check fuel in‐ (if ECTS <(-) 7°)
jectors -N30,
N31, N32,
N33, N83- .

– Check the Ig‐

nition Coils
with Power
Output Stage
-N70, N127,
N291, N292- .
Refer to
⇒ page 155 .
P032 Ignition/ – Check the En‐ • Comparison of --- 0.1 Sec • 2 DCY
1 Distributor gine Speed counted teeth
Engine (RPM) Sensor and number of
Speed In‐ -G28- . Refer teeth- (+_-) 1
put Circuit to tooth
Range/ ⇒ page 115 .
Perform‐
ance

4. DTC Tables 35
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Pa‐ Monitoring Frequency
sage cedure and Threshold Val‐ rameters Time of
ue with Enable Condi‐ Length checks,
tions MIL
Illum
P032 Ignition/ – Check the En‐ Comparison with --- 0.1 Sec • 2 DCY
2 Distributor gine Speed phase sensor sig‐
Engine (RPM) Sensor nal-
Speed In‐ -G28- . Refer No engine speed
put Circuit to signal
No Signal ⇒ page 115 .
P032 Knock – Check the Test impulse zero ECT->40° C 150 Sec • 2 DCY
4 Control Knock Sen‐ test-
System sors -G61, Procedure failed
Error G66- . Refer
to
⇒ page 152 .
P032 Knock – Check the (ULEV) Engine speed- 0.5 Sec • 2 DCY
7 Sensor 1 Knock Sensor Lower thresh‐ >2,200 Rpm
Circuit -G61- . Refer old-0.25 – 2.4 V ECT->40° C
Low to Engine load->25%
⇒ page 152 .
P032 Knock – Check the (LEV)Upper thresh‐ Engine speed- 0.5 Sec • 2 DCY
8 Sensor 1 Knock Sensor old- 4.6 – 58.0 V >2,200 Rpm
Circuit -G61- . Refer ECT->40° C
High to Engine load->25%
⇒ page 152 .
P033 Knock – Check the ULEV) Engine speed- 0.5 Sec • 2 DCY
2 Sensor 2 Knock Sensor Lower thresh‐ >2,200 Rpm
Circuit -G66- . Refer old-0.25 – 2.4 V ECT->40° C
Low to Engine load->25%
⇒ page 152 .
P033 Knock – Check the (LEV) Engine speed- 0.5 Sec • Multiple
3 Sensor 2 Knock Sensor Upper thresh‐ >2,200 Rpm
Circuit -G66- . Refer old-4.6 – 58.0 V ECT->40° C • 2 DCY
High to Engine load->25%
⇒ page 152 .
P034 Camshaft – Check the ULEV) Engine speed-600 2 Sec • 2 DCY
0 Position Camshaft Po‐ Comparison to en‐ – 1,600 Rpm 2 Sec
Sensor“A” sition (CMP) gine speed sensor ECT >50.25° C
Circuit Sensor - (adaptation)-Adap‐ Engine speed-600
G40- . Refer tation values at limit – 1,600 Rpm
to >16 KW ECT >50.25° C
⇒ page 147 . (LEV)Comparison
to engine speed
sensor (adapta‐
tion)-Adaptation
values at limit >16
KW
P034 Camshaft – Check the Comparison to en‐ --- 0.5 Sec • 2 DCY
1 Position Camshaft Po‐ gine speed sensor-
Sensor“A” sition (CMP) Signal high during
Circuit Sensor - 12 crankshaft rota‐
Range/ G40- . Refer tions
Perform‐ to Copying for private or commercial purposes, in part or in whole, is not
Protected by copyright.

ance ⇒correctness
page 147 .
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the of information in this document. Copyright by AUDI AG.
P034 Camshaft – Check the Comparison to en‐ -- 0.5 Sec • 2 DCY
2 Position Camshaft Po‐ gine speed sensor-
Sensor“ A” sition (CMP) Signal high during
Circuit Sensor - 12 crankshaft rota‐
Low G40- . Refer tions
to
⇒ page 147 .

36 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Pa‐ Monitoring Frequency
sage cedure and Threshold Val‐ rameters Time of
ue with Enable Condi‐ Length checks,
tions MIL
Illum
P034 Camshaft – Check the Comparison to en‐ --- 0.5 Sec • 2 DCY
3 Position Camshaft Po‐ gine speed sensor-
Sensor“ A” sition (CMP) Signal high during
Circuit Sensor - 12 crankshaft rota‐
High G40- . Refer tions
to
⇒ page
Protected by copyright. Copying147 . or commercial purposes, in part or in whole, is not
for private
P035 Ignition – Check the Ig‐ Short to battery Engine speed->80 0.5 Sec
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
• 2 DCY
1 Coil “A” nition Coils positive->5.2 – 6.0 rpm
with respect to the correctness of information in this document. Copyright by AUDI AG.

Primary/ with Power V

Secondary Output Stage Short to ground-
Circuit -N70- . Refer <0.5 – 1.0 V
to Open circuit- <5.0 –
⇒ page 155 . 8.8 mA
P035 Ignition – Check the Ig‐ Short to battery Engine speed->80 0.5 Sec • 2 DCY
2 Coil “B ” nition Coils positive->5.2 – 6.0 rpm
Primary/ with Power V
Secondary Output Stage Short to ground-
Circuit - N127- . Re‐ <0.5 – 1.0 V
fer to Open circuit-<5.0 –
⇒ page 155 . 8.8 mA
P035 Ignition – Check the Ig‐ Short to battery Engine speed->80 0.5 Sec • 2 DCY
3 Coil “C” nition Coils positive->5.2 – 6.0 rpm
Primary/ with Power V
Secondary Output Stage Short to ground-
Circuit - N291- . Re‐ <0.5 – 1.0 V
fer to Open circuit-<5.0 –
⇒ page 155 . 8.8 mAmps
P035 Ignition – Check the Ig‐ Short to battery Engine speed->80 0.5 Sec • 2 DCY
4 Coil “D” nition Coils positive->5.2 – 6.0 rpm
Primary/ with Power V
Secondary Output Stage Short to ground-
Circuit -N292- . Refer <0.5 – 1.0 V
to Open circuit-<5.0 –
⇒ page 155 . 8.8 mA

4. DTC Tables 37
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

Additional exhaust regulation

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0411 Secondary – Check the System too RICH- Catalyst temperature- 2 - 10 Sec 2 DCY
Air Injection Secondary <18% <700° C 30 Sec
System In‐ Air System (LEV) Flow check Engine speed-Idle
correct Flow hose rout‐ during normal SA in‐ Mass air flow-6 – 32
Detected ing. Refer to jection system too kg/h
Engine Me‐ RICH (check after Vehicle speed-Time
chanical engine start)-<45% after engine start-
Repair Flow check during >124 sec
Manual. SA injection enabled ECTS- 5 – 40° C
by monitor if 1st Altitude-<2,500 m
chance is not com‐ Air mass flow-<80 kg/
pleted (system too h
RICH)-<45% (make checks after
engine start up)
ECT->40° Cliability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any
Time after
with respect to the correctness of information in this document. Copyright by AUDIengine
AG.
starts->115 sec
Catalyst tempera‐
ture-700° C
Altitude-2,500 m
air mass flow-5 – 40
kg/h
Vehicle speed-<3
Mph
number of checks-<5
P0413 Secondary – Check the Open circuit-9.5 – Air valve, OFF 0.5 Sec 2 DCY
Air Injection Secondary 11.25 Volts Engine speed >80
System Air Injection rpm
Switching (AIR) Sole‐
Valve (A) noid Valve -
Circuit Open N112- . Re‐
fer to
⇒
page 139 .
P0414 Secondary – Check the Short to Battery + Air valve, On 0.5 Sec 2 DCY
Air Injection Secondary 2.2-4.2 V Engine speed, >80
System Air Injection Short to Ground, < 6 rpm
Switching (AIR) Sole‐ V Air valve, OFF
Valve (A) noid Valve - Engine speed >80
Circuit Shor‐ N112- . Re‐ rpm
ted fer to
⇒
page 139 .
P0418 Secondary – Check the Short to battery pos‐ Pump relay-ON 0.5 Sec 2 DCY
Air Injection Secondary itive-0.6 – 1.2 A Engine speed->80
System Con‐ Air Injection Short to ground-<3.0 Rpm
trol “A” Cir‐ (AIR) Sole‐ V Pump relay-OFF
cuit noid Valve - Open circuit-4.5 – Engine speed->80
N112- . Re‐ 5.5 V Rpm
fer to Pump relay-OFF
⇒ Engine speed->80
page 139 . rpm

38 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0420 Catalyst – Check the ULEV) Time after start-255 70 Sec‐ • Once/
System Effi‐ Heated AR->2 sec onds DCY
ciency Below Oxygen (LEV) Engine start tempera‐ Front:
Threshold Sensor AR-Front: >0.25 ture->(-) 10° C 90 Sec • 2
(HO2S) - Quattro: 0.26 Delta airflow-<20 kg/ DCY
G39-by. copyright.
Protected Refer Copying for private or commercialk/sec purposes, in part or in whole, is not
to unless authorised by AUDI AG. AUDI AG doesEvap
permitted purge
not guarantee flow-any liability
or accept
⇒ respect to the correctness of information in this document.
with <25% Copyright by AUDI AG.
page 122 . Mass air flow @-24 –
75 kg/h
– Check the Catalyst tempera‐
Oxygen ture-560 – 710° C
Sensor Mass air flow @-90 –
(O2S) Be‐ 120 kg/h
hind Three Catalyst tempera‐
Way Cata‐ ture-695 – 800° C
lytic Con‐ Front:Catalyst tem‐
verter perature-460 – 600° C
(TWC) - Engine speed-1,520 –
G130- . Re‐ 2,800 Rpm
fer to Engine load-10 – 35%
⇒ Quattro:
page 124 Catalyst tempera‐
ture-39 – 560° C
– Check the Engine speed-1,800 –
Three Way 3,200 Rpm
Catalytic Engine load-13 – 43%
Converter
(TWC). Re‐
fer to
⇒
page 137 .

4. DTC Tables 39
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0441 Evaporative – Check the Reaction of idle con‐ Engine speed-Idle 25 Sec‐ • 2
Emission Evaporative troller or lambda con‐ Speed deviation-(+/-) onds DCY
System Emission troller 80 Rpm
Incorrect (EVAP) deviation less than Altitude-2,500 m
Purge Flow Canister 7% lambda control‐ Time after start-
System for ler and 30% idle con‐ (ULEV) > 450 sec
proper seal. troller (LEV) > 600 sec
Refer to ECT or substitute
⇒ temperature-> 60 or
page 67 . 70° C

– Check the
Evaporative
Emission
(EVAP)
Canister
Purge Reg‐
ulator Valve
-N80- . Re‐
fer to
⇒
page 70 .

– Check the by AUDI AG. AUDI AG does not guarantee or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised
Leak
with respect to Detec‐
the correctness of information in this document. Copyright by AUDI AG.
tion Pump
(LDP) -
V144- . Re‐
fer to
⇒
page 73 .

40 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0442 Evaporative – Check the Pressure drop within Purge valve – Max 140 • 2
Emission Evaporative predetermined CLOSED seconds, DCY
System Emission times-<1.85 – 2.05 LDP-Activated once every
Leak Detec‐ (EVAP) sec (depending on Altitude-<2.500 m driving cy‐
ted (Small Canister altitude and intake Intake air tempera‐ cle
Leak) System for air temperature) ture->5° C
proper seal. Pressure drop within Ambient pressure->6
Refer to predetermined hPa
⇒ for private or commercial
Protected by copyright. Copying times-<2.3 – 2.7
purposes, sec
in part or inReduction
whole, is not of intake
permitted unless authorised page 67AG.
by AUDI . AUDI(depending on alti‐
AG does not guarantee or acceptairanystart:
liabilityno deep
tude and intake air down hill driving-vehi‐
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Check the temperature) cle speed at low load

Evaporative (<2%)
Emission Time after engine
(EVAP) start-255 sec
Canister Intake manifold low
Purge Reg‐ pressure>150 hPa
ulator Valve Engine temperature-5
-N80- . Re‐ - <115° C
fer to Restart ECT differ‐
⇒ ence->50° C
page 70 . Vehicle speed->6
mph
– Check the Purge valve –
Leak Detec‐ CLOSED
tion Pump LDP-Activated
(LDP) - Altitude-<2.500 m
V144- . Re‐ Ambient pressure-<3
fer to hPa
⇒ Intake manifold low
page 73 . pressure-> 130 hPa
Engine temperature-
(-)9.75 – 105° C
Restart temperature
difference-5° C
Reduction of intake
air-<5k
Time after restart-230
– 2,000 sec
P0444 Evaporative – Check the Open circuit-Signal • EVAP purge valve, 0.5 Sec‐ • 2
Emission Evaporative voltage off onds DCY
System Emission >4.5 - 5.5 V
Purge Con‐ (EVAP) • Engine speed, >
trol Valve Canister 80 RPM
Circuit Purge Reg‐
Open ulator Valve
-N80- . Re‐
fer to
⇒
page 70 .
P0445 Evaporative – Check the Short to Battery + 2.2 Evap. Purge valve-On 0.5 Sec‐ 2 DCY
Emission Evaporative - 4 V Engine speed-80 onds
System Emission Short to Ground, < 3 Rpm
Purge Con‐ (EVAP) V Evap. Purge valve-
trol Valve Canister OFF
Circuit Shor‐ Purge Reg‐ Engine speed-80
ted ulator Valve Rpm
-N80- . Re‐
fer to
⇒
page 70 .

4. DTC Tables 41
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0449 Evaporative – Check the (Only LEV Audi TT) Valve-ON 0.5 Sec 2 DCY
Emission Evaporative Short to battery pos‐ Engine speed- >80 0.5 Sec
System Vent Emission itive- rpm 0.5 Sec
Valve/Sole‐ (EVAP) 2.7 – 5.5 A Valve-OFF Engine
noid Circuit Canister Short to ground- speed- >80 rpm
System for >3.0 V Valve-OFF Engine
proper seal. Open circuit-4.5 – speed- >80 rpm
Refer to 5.5 V
⇒
page 67 .

– Check the
Evaporative
Emission
(EVAP)
Canister
Purge Reg‐
ulator Valve
-N80- . Re‐
fer to
⇒
page 70 .

– Check the
Leak Detec‐
tion Pump
(LDP) -
V144- . Re‐
fer to
⇒
page 73 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

42 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0455 Evaporative – Check the Pressure drop within Purge valve – Max 140 • 2
Emission Evaporative predetermined CLOSED Sec once DCY
System Leak Emission times-<0.95 Sec‐ LDP-Activated every driv‐
Detected (EVAP) onds Altitude-<2.500 m ing cycle
(large leak) Canister Pressure drop within Intake air tempera‐
System for predetermined ture-> 5 °C Ambient
proper seal. times-<2.3 – 2.7 sec‐ pressure-> 6hPa
Refer to onds (depending on Reduction of intake
⇒ altitude and intake air start: no deep
page 67 . air temperature) down hill driving-vehi‐
cle speed at low load
– Check the (<2%)
Evaporative Time after engine
Emission start-255 sec
(EVAP) Intake manifold low
Canister pressure> 150 hPa
Purge Reg‐ Engine temperature-5
ulator Valve - < 115 °C
-N80- . Re‐ Restart ECT differ‐
fer to ence-> 50 °C Vehicle
⇒ speed-> 6 Mph
page 70 . Purge valve –
CLOSED
– Check the LDP-Activated
Leak Detec‐ Altitude-<2.500 m
tion Pump Ambient pressure-< 3
(LDP) - hPa
V144- . Re‐ Intake manifold low
fer to pressure-> 130 hPa
⇒ Engine temperature-
page 73 . (-)9.75 – 105 °C
Restart temperature
difference- 5 °C
Reduction of intake
air-< 5k
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not Time after restart-230
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability – 2,000 sec
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 43
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Parame‐ Monitoring Fre‐
sage cedure and Threshold Value ters Time quency
with Enable Condi‐ Length of
tions checks
,
MIL
Illum
P0456 Evaporative – Check the Pressure drop within Purge valve – Max 140 • 2
Emission Evaporative predetermined CLOSED Sec once DCY
System Leak Emission times-<2.05– 7 sec LDP-Activated every driv‐
Detected (EVAP) Pressure drop within Altitude-<2.500 m ing cycle
(very small Canister predetermined Intake air tempera‐
leak) System for times-<2.3 – 2.7 sec ture-> 5 °C Ambient
proper seal. (depending on alti‐ pressure-> 6hPa
Refer to tude and intake air Reduction of intake
⇒ temperature) air start: no deep
page 67 . down hill driving-vehi‐
cle speed at low load
– Check the (<2%)
Evaporative Time after engine
Emission start-255 sec
(EVAP) Intake manifold low
Canister pressure> 150 hPa
Purge Reg‐ Engine temperature-5
ulator Valve - < 115 °C
-N80- . Re‐ Restart ECT differ‐
fer to ence-> 50 °C Vehicle
⇒ speed-> 6 Mph
page 70 . Purge valve –
CLOSED
– Check the LDP-Activated
Leak Detec‐ Altitude-<2.500 m
tion Pump Ambient pressure-< 3
(LDP) - hPa
V144- . Re‐ Intake manifold low
fer to pressure-> 130 hPa
⇒ Engine temperature-
page 73 . (-)9.75 – 105 °C
Restart temperature
difference- 5 °C
Reduction of intake
air-< 5k
Time after restart-230
– 2,000 sec

Speed and idle control

DTC Error Diagnostic Pro‐ Malfunction Secondary Param‐ Moni‐ Frequency
Message cedure Criteria eters toring of
and Thresh‐ with Enable Condi‐ Time checks,
old Value tions Lengt MIL
h Illum
P0501 Vehicle – Check vehi‐ Vehicle • Fuel cut off, ac‐ 4 Sec • 2 DCY
Speed cle speed speed sig‐ tive
Sensor signal. Refer nal-<2 mph
“A” to . • Engine speed,
Range/ 1520-4520 RPM
Perform‐
ance

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

44 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Pro‐ Malfunction Secondary Param‐ Moni‐ Frequency

Message cedure Criteria eters toring of
and Thresh‐ with Enable Condi‐ Time checks,
old Value tions Lengt MIL
h Illum
P0506 Idle Air – Check the Idle speed
Engine speed, idle 4 Sec • 2 DCY
Control Throttle deviationEngine load, < 37%
System Valve Con‐ (idle speed
ULEV::ECT, > 48°
RPM trol Module - too high) and
C
Lower J338- . Refer idle control‐
LEV:ECT, > 60° C
Than Ex‐ to ler at max.
Purge valve, off
pected ⇒ page 104 . threshold <-
Altitude, <2500 m
100 RPM Accelerator Posi‐
tion, 0%
Vehicle speed, 0
Mph
LEV: Air intake > 0°
C
P0507 Idle Air – Check the Idle speed Engine speed, idle 4 Sec • 2 DCY
Control Throttle deviation Fuel cut off, not ac‐
System Valve Con‐ (idle speed tive
RPM trol Module - too high) and ULEV:ECT, > 48° C
Higher J338- . Refer idle control‐ LEV:ECT, > 60° C
Than Ex‐ to ler at min. Purge valve, off
pected ⇒ page 104 . threshold > Altitude, <2500 m
200 Rpm Accelerator Posi‐
tion, 0%
Vehicle speed, 0
Mph
LEV: Air intake > 0°
C

Control module and output signals

DTC Error Diagnostic Proce‐ Malfunction Secondary Param‐ Monitoring Frequency
Mes‐ dure Criteria eters Time of
sage and Thresh‐ with Enable Condi‐ Length checks,
old Value tions MIL
Illum
P0600 Serial – Replace the Mo‐Short to bat‐ --- 0.5 Sec 2 DCY
Com‐ tronic Engine tery positive 0.5 Sec
muni‐ Control Module Short to
cation (ECM) -J220- . ground
Link Refer to Core connec‐
⇒ page 130 . tion
ECM receiv‐
ing no signal
from CAN bus
P0601 Internal – Replace the Mo‐ Calculate — 0.5 Sec • 2 DCY
Control tronic Engine check sum
Module Control Module
Memo‐ (ECM) -J220- .
ry Refer to
Check ⇒ page 130 .
Sum
Error

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 45
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Proce‐ Malfunction Secondary Param‐ Monitoring Frequency

Mes‐ dure Criteria eters Time of
sage and Thresh‐ with Enable Condi‐ Length checks,
old Value tions MIL
Illum
P0602 Control – Replace the Mo‐ Message ar‐ --- 0.5 Sec 2 DCY
Module tronic Engine riving from au‐
Pro‐ Control Module tomatic trans‐
gram‐ (ECM) -J220- . mission while
ming Refer to ECU is cali‐
Error ⇒ page 130 . brated for
manual trans‐
mission-Mes‐
sage from au‐
tomatic trans‐
mission
P0603 Internal – Replace the Mo‐ Write and --- 200 mS yes;
Control tronic Engine read back val‐ immediate
Module Control Module ue is not cor‐
Memo‐ (ECM) -J220- . rect
ry Refer to
Check ⇒ page 130 .
Sum
Error – Replace the
Transmission
Control Module
(TCM) -J217- .
Refer to Engine
Mechanical Re‐
pair Manual. or
the Continuously
Variable Trans‐
mission Repair
Manual.
P0604 Internal – Replace the Mo‐ Write ability — 0.5 Sec • 2 DCY
Control tronic Engine check
Module Control Module
Ran‐ (ECM) -J220- .
dom Refer to
Access ⇒ page 130 .
Memo‐
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
rywith respect to the correctness of information in this document. Copyright by AUDI AG.
(RAM)
Error
P0605 Internal – Replace the Mo‐ Wrong check — 0.5 Sec • 2 DCY
Control tronic Engine sum
Module Control Module
Read (ECM) -J220- .
Only Refer to
Memo‐ ⇒ page 130 .
ry
(ROM)
Error
P0606 Internal – Replace the Mo‐ Short to Bat‐ --- 2 Sec • 2 DCY
Control tronic Engine tery +, > 4.88
Module Control Module V
Memo‐ (ECM) -J220- . Short to
ry Refer to Ground, <
Check ⇒ page 130 . 0.14 V
Sum
Error

46 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Proce‐ Malfunction Secondary Param‐ Monitoring Frequency

Mes‐ dure Criteria eters Time of
sage and Thresh‐ with Enable Condi‐ Length checks,
old Value tions MIL
Illum
P0638 Throt‐ – Check the Throt‐ OPEN to > ref. Ignition-ON 5 Sec • 2 DCY
tle Ac‐ tle Valve Control Point (+) 12%- Engine speed-0
tuator Module -J338- . t> 0.14 sec‐ Rpm
Control Refer to onds Intake air tempera‐
Range/ ⇒ page 104 . Then ture-> 5 °C
Per‐ CLOSED to < Vehicle speed-0
for‐ ref. point Mph
mance (+) 3% ECT-> 5 °C
t > 0.56 Sec Ignition-ON
Closed to < Engine speed-0
1% Rpm
t > 0.3 Sec Intake air tempera‐
then ture-> 5 °C
OPEN to < ref. Vehicle speed-0
(-) 1.5% Mph
t > 0.56 Sec ECT-> 5 °C
Voltage rang‐ Ignition-ON
es- Engine speed-0
sensor1: 0.21 Rpm
- 0.87 V Intake air tempera‐
sensor 2: 4.14 ture-> 5 °C
- 4.84 V Vehicle speed-0
Mph
ECT-> 5 °C
P0685 ECM/ – Check the Mo‐ Open circuit- Sense circuit volt‐ 0.5 Sec • 2 DCY
PCM tronic Engine Control volt‐ age-<3.0 Volts
Power Control Module age <0.61
Relay (ECM) Power Volts
Control Supply Relay -
Circui‐ J271- . Refer to
tOpen ⇒ page 128 .
P0686 ECM/ – Check the Mo‐ Short to Sense circuit volt‐ 0.5 Sec • 2 DCY
PCM tronic Engine ground-Con‐ age- > 5.5 V
Power Control Module trol voltage
Relay (ECM) Power <0.51 Volts
Control Supply Relay -
Circuit J271- . Refer to
Low ⇒ page 128 .
P0687 ECM/ – Check the Mo‐ Short to bat‐ Sense circuit volt‐ 0.5 Sec • 2 DCY
PCM tronic Engine tery positive- age-< 3.0 V
Power Control Module Control volt‐
Relay (ECM) Power age >4.0 Volts
Control Supply Relay -
Circuit J271- . Refer to
High ⇒ page 128 .
P0688 ECM/ – Check the Mo‐ Voltage too • Main relay- On 2 Sec • 2 DCY
PCM tronic Engine low-<3.0 Volts
Power Control Module
Relay (ECM) Power
Sense Supply Relay -
Circuit J271- . Refer to
Open ⇒ page 128 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 47
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

Transmission 01V
DTC Error Diagnostic Procedure Malfunction Secondson‐ Monitor‐ Frequency of
Message Criteria and dary Param‐ ing Time checks, MIL
Threshold eters with Length Illum.
Value Enable Con‐
ditions
P0706 Trans‐ – Check the Multi-Function Illegal 4-bit Engine 2500 mS Yes, 2 DCY
mission Transmission Range (TR) position speed be‐
Range Switch -F125- . Refer to Auto‐ code not P or tween
Sensor matic Transmission Repair N while 100-448
Circuit Manual. or the Continuously cranking at RPM
=>-F125 Variable Transmission Repair engine start
Range/ Manual. up.
Perform‐
ance
P0716 Input Tur‐ – Check the Transmission Input • Turbine None or en‐ 200 mS Yes, 2 DCY
bine/ Speed (RPM) Sensor - speed gine speed,
Speed G182- . Refer to Automatic max, > > 608 RPM
Sensor Transmission Repair Manual. 8000
(A) Cir‐ or the Continuously Variable RPM
cuit Transmission Repair Manual.
Range/ • Turbine
Perform‐ speed
ance min, <160
RPM

P0721 Output – Check the Transmission Ve‐ • Output None or en‐ 1000 mS Yes, 2 DCY
Speed hicle Speed Sensor (VSS) - speed gine speed
Sensor G38- . Refer to Automatic max, > >40 km/h
Circuit Transmission Repair Manual. 6912
Range/ or the Continuously Variable RPM
Perform‐ Transmission Repair Manual.
ance • Output
speed
min, <160
RPM

P0730 Incorrect – Check the Transmission Input • Turbine • Output • 200 Yes, 2 DCY
Gear Ra‐ Speed (RPM) Sensor -G182- speed > speed, mS
tioProtected by copyright.
andCopying
Transmission Vehicle purposes, inthreshold
for private or commercial <250
part or in whole, is not
Speed by
permitted unless authorised Sensor
AUDI AG.(VSS)
AUDI AG-G38-
does not .guarantee
(stall) RPM in D, •
or accept any liability 3
Refer to Automatic Transmis‐ speed, >
with respect to the correctness of information in this document. Copyright by AUDI AG.
4, 3, 2 po‐ events
sion Repair Manual. or the 1200 rpm sition for • 2
Continuously Variable Trans‐ a time of symp‐
mission Repair Manual. • Synchro‐ >500 mS
nistion toms
not ach‐ • Output (P0730
ieved dur‐ speed, log‐
ing shift. >500 ged)
RPM
• Calcula‐
ted ratio • Output
outside speed,
allowable >256
range RPM
• Input
speed,
>416
RPM

48 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunction Secondson‐ Monitor‐ Frequency of

Message Criteria and dary Param‐ ing Time checks, MIL
Threshold eters with Length Illum.
Value Enable Con‐
ditions
P0731 Gear 1 In‐ • Check ATF level Differential --- 2.49 Sec‐ Yes, 2 DCY
correct speed, onds
Ratio • Check pressure regulator 416-320
valves RPM
• Check Solenoid Valve 1 -N88-
Mechanical malfunction in trans‐
mission
– byRefer
Protected toCopying
copyright. Automatic
for privateTransmis‐
or commercial purposes, in part or in whole, is not
sionauthorised
permitted unless RepairbyManual.
AUDI AG. AUDIor the
AG does not guarantee or accept any liability
Continuously
with respect to the correctnessVariable
of informationTrans‐
in this document. Copyright by AUDI AG.
mission Repair Manual.
P0732 Gear 2 In‐ • Check ATF level Differential --- 2.49 Sec‐ Yes, 2 DCY
correct speed, onds
Ratio • Check pressure regulator 416-320
valves RPM
• Check Solenoid Valve 2 -N89-
Mechanical malfunction in trans‐
mission
– Refer to Automatic Transmis‐
sion Repair Manual. or the
Continuously Variable Trans‐
mission Repair Manual.
P0733 Gear 3 In‐ • Check ATF level Differential --- 2.49 Sec‐ Yes, 2 DCY
correct speed, onds
Ratio • Check pressure regulator 416-320
valves RPM
• Check Solenoid Valve 3 -N90-
Mechanical malfunction in trans‐
mission
– Refer to Automatic Transmis‐
sion Repair Manual. or the
Continuously Variable Trans‐
mission Repair Manual.
P0734 Gear 4 In‐ • Check ATF level Differential --- 2.49 Sec‐ Yes, 2 DCY
correct speed, onds
Ratio • Check pressure regulator 416-320
valves RPM
• Check Solenoid Valve 4 -N91-
Mechanical malfunction in trans‐
mission
– Refer to Automatic Transmis‐
sion Repair Manual. or the
Continuously Variable Trans‐
mission Repair Manual.
P0735 Gear 5 In‐ • Check ATF level Differential --- 2.49 Sec‐ Yes, 2 DCY
correct speed, onds
Ratio • Check pressure regulator 416-320
valves RPM
• Check Solenoid Valve 5 -N92-
Mechanical malfunction in trans‐
mission
– Refer to Automatic Transmis‐
sion Repair Manual. or the
Continuously Variable Trans‐
mission Repair Manual.

4. DTC Tables 49
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunction Secondson‐ Monitor‐ Frequency of

Message Criteria and dary Param‐ ing Time checks, MIL
Threshold eters with Length Illum.
Value Enable Con‐
ditions
P0741 Torque – Check the Torque converter • compari‐ • Engine • 1 Sec‐ Yes, 2 DCY
Convert‐ clutch. Refer to theRefer to son with torque, ond
er Clutch Automatic Transmission Re‐ stored <140 Nm
Circuit pair Manual. or the Continu‐ values, • 1000
Perform‐ ously Variable Transmission Slip dif‐ • Clutch mS
ance or Repair Manual. ferences pressure,
Stuck Off. > 448 rpm > 5.24 bar

• Slip
thresh‐
old, 80
RPM

P0751 Shift Sol‐ – Check Solenoid Valve 1 - Solenoid on, --- 50 mS Yes, 2 DCY
enoid A N88-. Refer to Automatic measured V
Perform‐ Transmission Repair Manual. too high,
ance or or the Continuously Variable
Stuck Off. Transmission Repair Manual.
P0752 Shift Sol‐ – Check Solenoid Valve 1 - Solenoid on, --- 50 mS Yes, 2 DCY
enoid A N88-. Refer to Automatic measured V
Stuck On Transmission Repair Manual. too low, < 0.2
or the Continuously Variable
Transmission Repair Manual.
P0753 Shift Sol‐ – Check Solenoid Valve 1 - comparison battery V U > • 0.24 Yes, 2 DCY
enoid A N88-. Refer to Automatic of stored val‐ 9 V Sec‐
Electrical Transmission Repair Manual. ue with ac‐ ond‐
or the Continuously Variable tive level, sonds
Transmission Repair Manual. switch off
and U- < 2V • 0.02
or switch on Sec‐
and U >6 V ond‐
sonds

P0756 Shift Sol‐ – Check Solenoid Valve 2 - Solenoid on, --- 70 mS Yes, 2 DCY
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

enoid B N89-. Refer to

withAutomatic measured Vin this document. Copyright by AUDI AG.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
respect to the correctness of information
Perform‐ Transmission Repair Manual. too low, < 0.2
ance or or the Continuously Variable
Stuck Off. Transmission Repair Manual.
P0757 Shift Sol‐ – Check Solenoid Valve 2 - Solenoid on, --- 70 mS Yes, 2 DCY
enoid B N89-. Refer to Automatic measured V
Stuck On Transmission Repair Manual. too low, < 0.2
or the Continuously Variable
Transmission Repair Manual.
P0758 Shift Sol‐ – Check Solenoid Valve 2 - comparison battery V U > • 0.24 Yes, 2 DCY
enoid B N89-. Refer to Automatic of stored val‐ 9 V Sec‐
Electrical Transmission Repair Manual. ue with ac‐ ond‐
or the Continuously Variable tive level, sonds
Transmission Repair Manual. switch off U-
< 2V or • 0.02
switch on Sec‐
and U >6 V ond‐
sonds

P0761 Shift Sol‐ – Check Solenoid Valve 3 - Solenoid on, --- 70 mS Yes, 2 DCY
enoid C N90-. Refer to Automatic measured V
Perform‐ Transmission Repair Manual. too low, < 0.2
ance or or the Continuously Variable
Stuck Off. Transmission Repair Manual.

50 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Diagnostic Procedure Malfunction Secondson‐ Monitor‐ Frequency of

Message Criteria and dary Param‐ ing Time checks, MIL
Threshold eters with Length Illum.
Value Enable Con‐
ditions
P0762 Shift Sol‐ – Check Solenoid Valve 3 - Solenoid on, --- 70 mS Yes, 2 DCY
enoid C N90-. Refer to Automatic measured V
Stuck On Transmission Repair Manual. too low, < 0.2
or the Continuously Variable
Transmission Repair Manual.
P0763 Shift Sol‐ – Check Solenoid Valve 3 - comparison battery V U > • 0.24 Yes, 2 DCY
enoid C N90-. Refer to Automatic of stored val‐ 9 V Sec‐
Electrical Transmission Repair Manual. ue with ac‐ ond‐
or the Continuously Variable tive level, sonds
Transmission Repair Manual. switch off U-
< 2V or • 0.02
switch on Sec‐
and U >6 V ond‐
sonds

4.2 SAE P1xxx DTCs

Fuel and Air ratios, control module
DTC Error Mes‐ Diagnostic Procedure Malfunction Secondary Pa‐ Monitor‐ Frequency
sage Criteria rameters ing of
and Thresh‐ with Enable Time checks,
old Value Conditions Length MIL
Illum
P1176 Bank 1, – Check the Oxygen System too Lamda control‐ 100 Sec 2 DCY
Lambda cor‐ Sensor (O2S) Be‐ LEAN/ ler-
rection down‐ hind Three Way RICH delta CLOSED loop
stream of cat‐ Catalytic Convert‐ lambda sig‐ Rear O2 sensor
alyst control er (TWC) -G130- . nal->2% heater and elec‐
limit reached Refer to trical check-No
⇒ page 96 . DTC
Catalyst temper‐
ature-> 470 °C
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Engine
with respect to the correctness of information in this document. Copyright by AUDI AG.
speed-1,500 –
4,000 Rpm
Engine load-24
– 65%

4. DTC Tables 51
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

Transmission 01V
DTC Error Mes‐ Diagnostic Procedure Malfunction Secondson‐ Monitoring Frequency
sage Criteria dary Param‐ Time of
and Threshold eters Length checks,
Value with Enable MIL
Conditions Illum
P1560 Engine – Check the Trans‐ Engine speed In D, 4, 3, 2 100 mS Yes, 2 DCY
Over‐ mission Input > threshold, > position
speed Speed (RPM) 7400 rpm
Condition Sensor -G182-
and Transmission
Vehicle Speed
Sensor (VSS) -
G38- . Refer to Au‐
tomatic Transmis‐
sion Repair Man‐
ual. or the Contin‐
uously Variable
Transmission Re‐
pair Manual.
P1745 Voltage – Check Transmis‐ Switch off, V > 0.8 * U Batt 30 mS Yes, 2 DCY
supply for sion Control Mod‐ too high
solenoid ule (TCM) -J217- .
valves Refer to Automatic
Short cir‐ Transmission Re‐
cuit to B+ pair Manual. or the
Continuously Vari‐
able Transmission
Repair Manual.
P1747 Voltage – Check Transmis‐ Switch on, V < 2.5 V 30 mS Yes, 2 DCY
supply for sion Control Mod‐ too low
solenoid ule (TCM) -J217- .
valves Refer to Automatic
Open cir‐ Transmission Re‐
cuit/short pair Manual. or the
circuit to Continuously Vari‐
Ground able Transmission
(GND) Repair Manual.
P1748Protected
Internal – Copying
by copyright. Check Transmis‐
for private or commercialTCM internal
purposes, in part or in whole, is---
not 100 mS Yes, 2 DCY
Control
permitted sion
unless authorised Control
by AUDI AG. AUDIMod‐
AG does hardware
not guarantee or accept any liability
Module ule (TCM)
with respect to the correctness -J217-
of information . document.
in this watchdog de‐by AUDI AG.
Copyright
Memory Refer to Automatic tects fault
Check Transmission Re‐
Sum Error pair Manual. or the
Continuously Vari‐
able Transmission
Repair Manual.
P1750 System – Check Transmis‐ • Voltage, U < • Engine • 0.14 Sec‐ Yes, 2 DCY
Voltage, sion Control Mod‐ 9V speed, > ondsonds
Low Volt‐ ule (TCM) -J217- 1600 rpm
age voltage supply. • Ignition • 2500 mS
Refer to Automatic range out of
Transmission Re‐ range, 7.0 V
pair Manual. or the < U <9.0 V
Continuously Vari‐
able Transmission
Repair Manual.

52 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Procedure Malfunction Secondson‐ Monitoring Frequency

sage Criteria dary Param‐ Time of
and Threshold eters Length checks,
Value with Enable MIL
Conditions Illum
P1751 System – Check Transmis‐ Ignition supply Engine 300 mS Yes, 2 DCY
Voltage sion Control Mod‐ out of allowable speed,
High Volt‐ ule (TCM) -J217- range, U > 16 V >1400 rpm
age voltage supply. and U < 7 V
Refer to Automatic
Transmission Re‐
pair Manual. or the
Continuously Vari‐
able Transmission
Repair Manual.
P1814 Pressure – Refer to Automatic PWM should Ignition volt‐ 70 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -1- pair Manual. or the to 0-100% or current
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N215-
Open cir‐
cuit/short
circuit to
Ground
(GND)
P1815 Pressure – Refer to Automatic PWM should Ignition volt‐ 70 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -1- pair Manual. or the to 0-100% or current
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N215- Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

Short cir‐
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
cuit to B+
P1819 Pressure – Refer to Automatic PWM should Ignition volt‐ 50 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -2- pair Manual. or the to 0-100% or current
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N216-
Open cir‐
cuit/short
circuit to
Ground
(GND)
P1820 Pressure – Refer to Automatic PWM should Ignition volt‐ 50 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -2- pair Manual. or the to 0-100% or current
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N216-
Short cir‐
cuit to B+

4. DTC Tables 53
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Procedure Malfunction Secondson‐ Monitoring Frequency

sage Criteria dary Param‐ Time of
and Threshold eters Length checks,
Value with Enable MIL
Conditions Illum
P1824 Pressure – Refer to Automatic PWM should Ignition volt‐ 50 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -3- pair Manual. or the to 0-100% or current
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N217-
Open cir‐
cuit/short
circuit to
Ground
(GND)
P1825 Pressure – Refer to Automatic PWM should Ignition volt‐ 50 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -3- pair Manual. or the to 0-100% or current
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N217-
Short cir‐
cuit to B+
P1829 Pressure – Refer to Automatic PWM should Ignition volt‐ • 70 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -4- pair Manual. or the to 100% or current • 500 mS
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N218-
Open cir‐
cuit/short
circuit to
Ground
(GND)
P1830 Pressure – Refer to Automatic PWM should Ignition volt‐ • 70 mS Yes, 2 DCY
control Transmission Re‐ toggle, but held age, >9.0 V
valve -4- pair Manual. or the to 0% or current • 500 mS
for auto. Continuously Vari‐ and voltage,
transmis‐ able Transmission >500 mA, 7V
sion - Repair Manual.
N218-
Short cir‐ Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
cuit to B+ permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
P1841 Engine – Replace the --- --- 0 mS Yes, 2 DCY
control Transmission
module/ Control Module
Transmis‐ (TCM) -J217- . Re‐
sion Con‐ fer to Automatic
trol Mod‐ Transmission Re‐
ule (TCM) pair Manual. or the
Versions Continuously Vari‐
not com‐ able Transmission
patible Repair Manual.
P1850 Data-bus- – Refer to Automatic No network to‐ --- 1000 mS Yes, 2 DCY
drivetrain Transmission Re‐ ken for 850 mS
missing pair Manual. or the
message Continuously Vari‐
from en‐ able Transmission
gine con‐ Repair Manual.
trol mod‐
ule

54 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Procedure Malfunction Secondson‐ Monitoring Frequency

sage Criteria dary Param‐ Time of
and Threshold eters Length checks,
Value with Enable MIL
Conditions Illum
P1854 Data-Bus- – Refer to Automatic No CAN bus --- 1000 mS Yes, 2 DCY
driving Transmission Re‐ activity for 30
gear Hard‐ pair Manual. or the mS
ware faulty Continuously Vari‐
able Transmission
Repair Manual.
P1855 Data-Bus- – Refer to Automatic CAN level not --- 100 mS Yes, 2 DCY
driving Transmission Re‐ correct
gear Soft‐ pair Manual. or the
ware ver‐ Continuously Vari‐
sion moni‐ able Transmission
toring Repair Manual.
P1861 Throttle – Check the Throttle Fault flag is --- 400 mS Yes, 2 DCY
Position Position (TP) Sen‐ transmitted,
(TP) Sen‐ sor -G79- . Refer to fault flag set
sor -G79- ⇒ page 77 .
Malfunc‐
tion indica‐
tion from
Engine
Control
Module
(ECM)

4.3 SAE P2xxx DTCs

Fuel and air ratio
DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Param‐ Monitor‐ Frequency
sage cedure and Threshold Val‐ eters ing of
ue with Enable Condi‐ Time checks,
tions Length MIL
Illum
P210 Evaporative – Check the Max. current- ECM power stage- 0.5 Sec • 2 DCY
1 Emission Leak Detec‐ > 80% Failure 0.5 Sec
System tion Pump Throttle valve angle ---
Leak Detec‐ (LDP) - deviation-
tion Pump V144- . Re‐ Max=4 – 50%
Control Cir‐ fer to
cuit Low ⇒
page 73 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
P212 Throttle/ permitted
– Check the by
unless authorised (ULEV) Sensororvoltage
AUDI AG. AUDI AG does not guarantee accept any2- 0.5 Sec
liability • 2 DCY
2 Pedal Posi‐ with respect
Throttle
to the Po‐ Lower
correctness threshold-
of information > 1.11
in this document. Copyright by VAUDI AG. 0.5 Sec
tion Sensor/ sition (TP) < 0.63 V Sensor voltage 2-
Switch C Sensor - (LEV) > 1.15 V
Circuit Low G79- / Ac‐ Lower threshold-<
Input celerator 0.63 V
Pedal Posi‐
tion Sensor
2 -G185- .
Refer to
⇒
page 77 .

4. DTC Tables 55
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Param‐ Monitor‐ Frequency
sage cedure and Threshold Val‐ eters ing of
ue with Enable Condi‐ Time checks,
tions Length MIL
Illum
P212 Throttle/ – Check the Upper threshold- — 0.5 Sec • 2 DCY
3 Pedal Posi‐ Throttle Po‐ > 4.82 Volts
tion Sensor/ sition (TP)
Switch C Sensor -
Circuit High G79- / Ac‐
Input celerator
Pedal Posi‐
tion Sensor
2 -G185- .
Refer to
⇒
page 77 .
P212 Accelerator – Check the (ULEV) Sensor voltage 2- 0.5 Sec • 2 DCY
7 pedal posi‐ Throttle Po‐ Lower threshold- > 1.11 V 0.5 Sec
tion sender sition (TP) < 0.43 V Sensor voltage 2- ♦ 2 DCY
2- Sensor - (LEV) > 1.15 V
G185 signal G79- / Ac‐ Lower threshold-
too low celerator < 0.33 V
Pedal Posi‐
tion Sensor
2 -G185- .
Refer to
⇒
page 77 .
P212 Accelerator – Check the Upper threshold- — 0.5 Sec • 2 DCY
8 pedal posi‐ Throttle Po‐ > 4.94
tion sender sition (TP)
2- Sensor -
G185 signal
Protected by copyright.G79-
Copying/ for
Ac‐private or commercial purposes, in part or in whole, is not
too high
permitted celerator
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

Pedal Posi‐
with respect to the correctness of information in this document. Copyright by AUDI AG.

tion Sensor
2 -G185- .
Refer to
⇒
page 77 .
P213 Throttle/ – Check the (ULEV) Sensor voltage1,2- 0.5 Sec • 2 DCY
8 Pedal Posi‐ Throttle Po‐ Comparison signal, > 0.84V 0.5 Sec‐
tion Sensor/ sition (TP) sensor 1 –vs- sen‐ Sensor voltage 1, 2- ond ♦ 2 DCY
Switch C Sensor - sor 2 >0.86V
Circuit G79- / Ac‐ difference-
Range/Per‐ celerator > 0.21 - 1.11 V
formance Pedal Posi‐ (LEV)
tion Sensor Comparison signal,
2 -G185- . sensor 1 –vs- sen‐
Refer to sor 2
⇒ difference-
page 77 . > 0.21 - 1.23 V

56 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
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DTC Error Mes‐ Diagnostic Pro‐ Malfunction Criteria Secondary Param‐ Monitor‐ Frequency
sage cedure and Threshold Val‐ eters ing of
ue with Enable Condi‐ Time checks,
tions Length MIL
Illum
P218 Malfunction – Check the Engine coolant Engine start tem‐ Once per 2 DCY
1 in cooling Engine temperature- perature- driving
system Coolant < 80.25 °C 5 – 30 °C cycle
Tempera‐ Sufficient mass air- Average air mass Once per
ture (ECT) 8 – 18 kg range (depending driving
Sensor - Engine coolant on average speed)- cycle
G62- . Refer temperature- > 18 – 60 kg/h
to > 10 K Average vehicle
⇒ Sufficient mass air- speed-
page 107 4 – 11.5 kg 9 – 80 Mph
Total time fuel cut
off-
< 100 sec
Engine start tem‐
perature-
5 – 30 °C
Average air mass
range (depending
on average speed)-
> 24 – 62 kg/h
Average vehicle
speed-
22 – 74 Mph
Total time fuel cut
off-
< 100 seconds
Delta ambient pres‐
sure per monitor-
< 15hPa

Additional emission regulations

DTC Error Message Diagnostic Pro‐ Malfunc‐ Secondary Pa‐ Monitoring Frequency
cedure tion Crite‐ rameters Time of
ria with Enable Length checks,
and Conditions MIL
Threshold Illum
Value
P2400 Evaporative – Check the Open cir‐ LPD- 0.2 Sec • 2 DCY
Emission Sys‐ Leak Detec‐ cuit- < 2.25 OFF
tem Protected by copyright. tion Pump V Engine speed-
Leakpermitted
Detection (LDP) - AG. AUDI AG does not guarantee
> 80 Rpm
Copying for private or commercial purposes, in part or in whole, is not
unless authorised by AUDI or accept any liability
Pump with
Control V144- .ofRefer
respect to the correctness information in this document. Copyright by AUDI AG.
Circuit/Open to
⇒ page 73 .
P2401 Evaporative – Check the Short to LPD- 0.2 Sec • 2 DCY
Emission Sys‐ Leak Detec‐ ground- < OFF
tem tion Pump 2.25-3.01 Engine speed-
Leak Detection (LDP) - V > 80 Rpm
Pump Control V144- . Refer
Circuit Low to
⇒ page 73 .
P2402 Evaporative – Check the Short to LPD- 0.2 Sec • 2 DCY
Emission Sys‐ Leak Detec‐ battery ON
tem tion Pump positive- Engine speed-
Leak Detection (LDP) - >3.01 > 80 Rpm
Pump Control V144- . Refer Volts
Circuit High to
⇒ page 73 .

4. DTC Tables 57
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

DTC Error Message Diagnostic Pro‐ Malfunc‐ Secondary Pa‐ Monitoring Frequency
cedure tion Crite‐ rameters Time of
ria with Enable Length checks,
and Conditions MIL
Threshold Illum
Value
P2403 Evaporative – Check the Contact LDP-OFF 0.2 Sec • 2 DCY
Emission Sys‐ Leak Detec‐ unable to Purge valve
tem tion Pump CLOSE- check-
Leak Detection (LDP) - Signal al‐ Completed
Pump Sense V144- . Refer ways low
Circuit/Open to
⇒ page 73 .
P2404 Evaporative – Check the Contact LDP-ON 0.2 Sec • 2 DCY
Emission Sys‐ Leak Detec‐ unable to Purge valve
tem tion Pump OPEN- check-
Leak Detection (LDP) - Signal al‐ Completed
Pump Sense V144- . Refer ways high
Range/Per‐ to
formance ⇒ page 73 .
P2422 Evaporative – Check the (Only LEV Purge valve – 240 Sec 2 DCY
Emission Sys‐ Leak Detec‐ Audi TT) OPEN
tem Vent Valve tion Pump 2nd leak LDP-
Stuck Closed (LDP) - check Activated
V144- . Refer while valve Altitude-< 2.500
to is open- m
⇒ page 73 . <2.3 – 2.7 Intake air tem‐
seconds perature-
> 5 °C
Ambient pres‐
sure-
> 6 hPa
Reduction of in‐
take air start: no
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctnessdeep downhill
of information in this document. Copyright by AUDI AG.
driving-vehicle
speed at low
load (< 2%)
Time after en‐
gine start-
255 sec
Intake manifold
low pressure >
150 hPa
Engine temper‐
ature- 5 - < 115 °
C
Restart ECT dif‐
ference-
> 50 °C
Vehicle speed-
> 6 Mph

58 Rep. Gr.ST - Generic Scan Tool

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

4.4 SAE P3xxx DTCs

Fuel and air mixture, additional emissions regulations
DTC Error Mes‐ Diagnostic Pro‐ Malfunction Crite‐ Secondary Monitoring Frequency
sage cedure ria Parame‐ Time of
and Threshold ters Length checks,
Value with Ena‐ MIL
ble Condi‐ Illum
tions
P3081 Engine – Check the En‐ Measured temper‐ --- Once/DCY • 2 DCY
Tempera‐ gine Coolant ature lower than Once per
ture Too Temperature model tempera‐ DCY 2 DCY
Low (ECT) Sensor ture-
-G62- . Refer >10 K
to Measured temper‐
⇒ page 107 . ature-
< 65 °C
Measured temper‐
ature lower than
model tempera‐
ture-
>10 K
Measured temper‐
ature-
< 50 °C

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. DTC Tables 59
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

20 – Fuel Supply
1 Fuel Supply System, Servicing
⇒ “1.1 Safety Precautions”, page 60
⇒ “1.2 Clean Working Conditions”, page 61
⇒ “1.3 Fuel Pump, Electrical Testing”, page 61
⇒ “1.4 Fuel Pump Delivery Quantity, Checking”, page 63
For all fuel supply system component locations. Refer to Fuel
Supply Repair Manual.
For all fuel supply system removal/installation procedures and
torque specifications. Refer to Fuel Supply Repair Manual.
Check the Technical Bulletins for information that may supersede
any information
Protected by copyright.included in this
Copying for private manual.purposes, in part or in whole, is not
or commercial
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

♦ All manufacturers special tools as well as common tools may

contain a manufacturer specific part number. These tools may
be substituted with an equivalent aftermarket tool or are avail‐
able for purchase through Audi. Refer to ⇒ Tool catalog .
♦ Manufacturers special tools as well as common tools that con‐
tain a manufacturer specific part number may be referenced
in the test procedure illustrations showing the tool use or in‐
stallation. If the manufacturer specific tool is not being used,
an equivalent aftermarket tool may be installed in the same
manner as the manufacturers special tool.

1.1 Safety Precautions

WARNING

The use of nails, paper clips, or another unauthorized materials

to back-probe electrical harness connectors is strictly prohibi‐
ted and may cause damage to the electrical harness connec‐
tors, terminal ends or damage to a component. Use only the
manufacturers test lead kit or an equivalent aftermarket test
lead kit for back-probing all electrical harness connectors.

WARNING

♦ The fuel system is under pressure! Before opening the sys‐

tem, place rags around the connection area. Then release
the pressure by carefully loosening the connection.
♦ The engine section of the fuel system, after the high pres‐
sure pump, is under extremely high pressure! When work‐
ing on the engine or the fuel injection system, the pressure
must be relieved to residual pressure before opening the
high pressure components.
♦ Place sources of flame, e.g. cigarette lighters, as well as
those sources of others in the area, out of reach. These can
ignite fuel vapors.

60 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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Perform the following steps before beginning work on the fuel

supply system:
♦ Disconnect the battery Ground (GND) cable with the ignition
switched off . Refer to Electrical Equipment Repair Manual.
♦ Open the fuel filler flap briefly and then close again.
When removing and installing components from full or partially full
fuel tanks, observe the following:
♦ The fuel tank must only be partially full. How much fuel can
remain in the fuel tank may be read in the respective work
description. Empty the fuel tank if necessary .
♦ Before starting work, switch on the exhaust extraction system
and place an extraction hose close to the installation opening
of the fuel tank to extract escaping fuel fumes. If no exhaust
extraction system is available, a radial fan (as long as motor
is not in air flow) with a displacement greater than 15 m3/h can
be used.
♦ Prevent fuel from contacting the skin! Wear fuel-resistant
gloves!

1.2 Clean Working Conditions

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
When working on the fuel supply/injection system, pay careful at‐
tention to the following Clean Working Conditions:
♦ Thoroughly clean all connections and the surrounding area
before disconnecting.
♦ Place parts that have been removed on a clean surface and
cover them. Do not use fluffy cloths!
♦ Carefully cover over opened components or seal, if repairs are
not performed immediately.
♦ Only install clean components: Only unpack replacement
parts immediately prior to installation. Do not use parts that
have been stored unpacked (e.g. in tool boxes etc.).
♦ When the system is open: Do not work with compressed air.
Do not move vehicle unless absolutely necessary.

1.3 Fuel Pump, Electrical Testing

Special tools and workshop equipment required
♦ Hand held remote control (jumper) .
♦ Multimeter .
♦ Electrical connector test lead set .
Test conditions
• Battery voltage 12.5 V.
• Fuse -29- in fuse holder at left of instrument panel is OK.
• Fuel filter OK.
• Ignition switched off.
Test sequence
– Remove rear seat bench Refer to Body Interior Repair Manual.

1. Fuel Supply System, Servicing 61

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Remove cover retainers -arrows- from the right sealing flange.

– Disconnect the electrical harness connector -arrow- from the

fuel delivery unit.
– Connect a Hand held remote control (jumper) to terminal -1-
of the fuel delivery unit and to vehicle battery (+).

– Connect a jumper cable from a Electrical connector test lead

set to terminal -5- of the fuel delivery unit and to vehicle Ground
(GND).
– Press switch on the Hand held remote control (jumper) .

Note

The Fuel Pump (FP) runs quietly. Avoid surrounding noises while
testing the fuel pump.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Listenpermitted
for anunless
operating noise from the fuel pump.
authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If no operating noise is heard:
– Remove the fuel delivery unit. Refer to Fuel Supply Repair
Manual.

62 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a Multimeter , check the electrical circuit between ter‐

minals -1- and -5- of the fuel delivery unit for continuity.
Specified value: 0 ohms.
If a malfunction is detected in the electrical circuit:
– Check the wiring for a short circuit to Battery positive (+) or an
open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the electrical circuit.
– If no malfunction is detected in electrical circuit, replace the
fuel pump. Refer to Fuel Supply Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3 Protected
- If the DTC memory
by copyright. was erased,
Copying for private generate
or commercial purposes, inreadiness
part or in whole,code.
is not
Refer
permitted toauthorised
unless ⇒ pageby18 AUDI . AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– End of diagnosis.

1.4 Fuel Pump Delivery Quantity, Checking

Special tools and workshop equipment required
♦ Hand held remote control (jumper) .
♦ Multimeter .
♦ Electrical connector test lead set .
♦ Fuel pressure test set (high pressure) .
♦ Measuring container, fuel-resistant .
Test conditions
• Battery voltage 12.5 V
• Fuel filter OK
• Fuel tank at least 1/4 filled.
• Fuel pressure regulator OK.
• Ignition switched off.
Test sequence
– Remove the fuel filler cap from fuel filler tube.
– Remove rear seat bench. Refer to Body Interior Repair Man‐
ual.

1. Fuel Supply System, Servicing 63

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Remove cover retainers -arrows- from the right sealing flange.

– Disconnect the electrical harness connector -arrow- from the

fuel delivery unit.
– Connect a Hand held remote control (jumper) to terminal -1-
of the fuel delivery unit and to vehicle battery (+).

– Connect a jumper cable from a Electrical connector test lead

set to terminal -5- of the fuel delivery unit and to vehicle Ground
(GND).

WARNING

Fuel system is under pressure! Before opening the system,

place rags around the connection area. Then release the pres‐
sure by carefully loosening the connection.

– Disconnect the fuel return line -arrow- by pressing release

buttons.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

64 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Connect a fuel line from the Fuel pressure test set (high pres‐
sure) to the disconnected fuel return line and hold it in the
measuring container .
– Press the switch on the Hand held remote control (jumper) and
operate the fuel pump for 15 seconds.

– Compare quantity of fuel delivered with minimum delivery rate

in the diagram (cm3/15s).

Note

Voltage at the fuel pump with engine stopped and fuel pump run‐
ning is approx. 2 volts less than battery voltage.

If minimum delivery quantity is not obtained, the following mal‐

functions may be present:
♦ Fuel lines pinched.
♦ Fuel filter plugged.
♦ Fuel pump faulty.
– If necessary, repair any pinched or plugged lines.
– Replace the fuel filter. Refer to Fuel Supply Repair Manual.
– Replace the fuel pump. Refer to Fuel Supply Repair Manual.
Assembly is performed in reverse order of removal. Note the fol‐
lowing:
– Install the rear seat bench. Refer to Body Interior Repair Man‐
ual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Fuel Supply System, Servicing 65

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

2 EVAP System
⇒ “2.1 EVAP System, Leak Detection”, page 66
⇒ “2.2 EVAP System, Checking for Proper Seal”, page 67
⇒ “2.3 EVAP Canister Purge Regulator Valve, Checking”,
page 70
⇒ “2.4 Leak Detection Pump, Checking”, page 73
For all EVAP system component locations and hose routing. Re‐
fer to Fuel Supply Repair Manual.
For the EVAP system hose routing. Refer to Fuel Supply Repair
Manual.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
For permitted
all EVAP system
unless authorisedsystem removal/installation
by AUDI AG. procedures
AUDI AG does not guarantee and
or accept any liability
torquewithspecifications. Refer
respect to the correctness to Fuel inSupply
of information Repair
this document. Manual.
Copyright by AUDI AG.

Check the Technical Bulletins for information that may supersede

any information included in this manual.

Note

♦ All manufacturers special tools as well as common tools may

contain a manufacturer specific part number. These tools may
be substituted with an equivalent aftermarket tool or are avail‐
able for purchase through Audi. Refer to ⇒ Tool catalog .
♦ Manufacturers special tools as well as common tools that con‐
tain a manufacturer specific part number may be referenced
in the test procedure illustrations showing the tool use or in‐
stallation. If the manufacturer specific tool is not being used,
an equivalent aftermarket tool may be installed in the same
manner as the manufacturers special tool.
♦ The manufacturers test box Test Box 105 Pin -VAG1598/31-
is available for purchase or rental. Refer to the ⇒ Tool catalog .

2.1 EVAP System, Leak Detection

Function
The leak detection system recognizes leaks in the complete fuel
system, including the fuel tank, EVAP canister and the Evapora‐
tive Emission (EVAP) Canister Purge Regulator Valve -N80- .
On the mechanical side, the leak detection system consists main‐
ly of a vacuum-driven diaphragm pump equipped with a reed
contact on the actuation rod of the pump diaphragm. The pump
is supplied with vacuum via the engine intake stroke.
♦ When leak detection is activated, the diaphragm pump pumps
the fuel system up to 20 … 30 mbar. The pump diaphragm is
then moved out so that the reed contact at the operating rod
remains in the “open” position.
♦ During the leak diagnosis, the reed contact is monitored to
check if it remains open within 10 seconds. This indicates the
system is sealed.
♦ If the pressure falls (indicating a leak), the diaphragm moves
back and the reed contact closes.
♦ If the reed contact closes within 10 seconds of leak detection
time, a further test is performed: In this case the diaphragm
pump pumps four times again. The Motronic Engine Control
Module (ECM) -J220- measures the time for each of the four
pumps until the reed contact is closed again. From that, the

66 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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control module can recognize a “small leak” (greater than 1

mm in diameter) or a “large leak”.
Leak diagnosis is activated automatically shortly following every
engine start. If a malfunction is determined, an entry is made to
the Diagnostic Trouble Code (DTC) memory. The Malfunction In‐
dicator Lamp (MIL) -K83- in the instrument cluster lights up if the
malfunction is recognized for two subsequent starts.

2.2 EVAP System, Checking for Proper

Seal

Note Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Secure all hose connections using hose clamps appropriate
for the model type ⇒ Parts catalog .
♦ Replace seals and gaskets when performing repair work.

Test sequence
– Connect the scan tool.
– Start the engine and let run at idle for at least 15 minutes.
– Select “Diagnostic mode 8: Tank leak test”.
– Select the “OBDMID 01: Tank leak test” and check the speci‐
fied value at idle.
Specified value: test OK

Note

♦ If the accelerator pedal is depressed during the test, the test

will be aborted.
♦ To repeat the tank leak-tightness test, switch the ignition off,
start the engine again, and let it run at idle.

If the specified value is obtained:

– End diagnosis and switch the ignition off.
If the specified value is not obtained:
Checking fuel supply and tank ventilation systems for leaks
– Ensure the fuel filler cap is properly installed on the fuel tank.
– Check the fuel filler cap seal for damage. Replace if necessa‐
ry.
– Remove the rear seat bench Refer to Body Interior Repair
Manual.

2. EVAP System 67
 A4 2002 ➤
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– Release the retaining tabs -arrows-.

– Release the retaining tabs -1- and -3-.

– Lift the cover -2- toward the front -arrow-.

– Unbolt the cover -arrows-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

68 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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– Remove the bolts -arrows- and cover.

– Check the seals under the locking flanges are OK and the un‐
ion nuts are properly tightened on the fuel tank. Also check the
fuel line connections.
– Visually check all hose connections of the fuel supply system
and replace any leaking lines, e.g:
♦ Check the line from the EVAP canister to the Evaporative
Emission (EVAP) Canister Purge Regulator Valve -N80- .
♦ Check the lines from the EVAP canister to the Leak Detection
Pump (LDP) -V144- .
♦ Check the line from the fuel tank to the EVAP canister (below
cover for EVAP canister).
♦ Check the lines for the tank ventilation (beneath right rear
wheel housing liner).
♦ Check the fuel lines to the engine.

Note

Leaks at the lines and components of the fuel tank ventilation

system can sometimes be located using a non-flammable, envi‐
ronmentally compliant leak detection spray. Initiate the leak di‐
agnosis several times in sequence to build up pressure in the
system. At leaking areas, bubbles will form.

– Repeat the function test.

If a leak is detected:
– Perform a visual inspection on the fuel system components
and tank ventilation system.
♦ Fuel tank.
♦ EVAP canister.
♦ Leak Detection Pump (LDP) -V144- .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
♦ Evaporative Emission (EVAP) Canister Purge Regulator
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Valve -N80- . with respect to the correctness of information in this document. Copyright by AUDI AG.

Note

Due to the form or function of the components, leaking areas may

not always be localized by spraying on the leak detection spray.
It may be necessary to clamp off the relevant component using
Hose Clamps Up To 25mm Dia. and initiate the tank leak detec‐
tion diagnostic. If the leak is no longer indicated, the component
that was clamped off is faulty. If clamped off directly at the leak
detection pump and a leak is still indicated, the leak detection
pump itself is leaking.

Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .

2. EVAP System 69
 A4 2002 ➤
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– End of diagnosis.

2.3 EVAP Canister Purge Regulator Valve,

Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
• The Evaporative Emission (EVAP) Canister Purge Regulator
Valve -N80- fuse OK.
• The ignition switched off.

Note

Voltage for the Evaporative Emission (EVAP) Canister Purge

Regulator Valve -N80- is supplied via the Engine Component
Power Supply Relay -J757- .

Procedure Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Remove the engine cover with air filter. Refer to Fuel Injection
and Ignition Repair Manual.

– Disconnect the Evaporative Emission (EVAP) Canister Purge

Regulator Valve -N80- electrical harness connector -1-.
Checking internal resistance

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 A4 2002 ➤
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– Using a Multimeter , check the Evaporative Emission (EVAP)

Canister Purge Regulator Valve -N80- terminals 1 and 2 for
resistance.
Specified value: 22.0 to 30.0 Ω.
If the specified value is not obtained:
– Replace the Evaporative Emission (EVAP) Canister Purge
Regulator Valve -N80- .
If the specification is obtained:
Checking voltage supply

– Using a Multimeter , check the electrical harness connector

terminal 1 to 2 for voltage.
– Operate the starter briefly.
Specified value: battery voltage.
If the specified value was not obtained:

– Using a Multimeter , check the electrical harness connector

terminal 1 for voltage.
Evaporative Emission (EVAP) Measure to
Canister Purge Regulator Valve -
N80-
electrical harness
connector terminal
1 Engine Ground (GND)
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– unless
permitted Operate thebystarter
authorised AUDI AG.briefly.
AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Specified value: battery voltage.
If the specified value is not obtained:
– Check the wiring connection from terminal 2 of Fuel Pump
Relay -J17- to pin 1 of N80 connector for an open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the wiring connection.
If the specified value was obtained:
Check Ground (GND) activation

2. EVAP System 71
 A4 2002 ➤
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– Using a Multimeter , check the electrical harness connector for

voltage.
Evaporative Emission (EVAP) Can‐ Measure to
ister Purge Regulator Valve -N80-
electrical harness
connector terminal
2 Battery positive (+)
– Operate the starter briefly.
Specified value: battery voltage.
– Switch the ignition off.
If the specified value was not obtained:
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

72 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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– Using a Multimeter , check the Evaporative Emission (EVAP)

Canister Purge Regulator Valve -N80- electrical connector
terminal 2 to Motronic Engine Control Module (ECM) -J220-
electrical connector terminal 64 for an open circuit.
Evaporative Emission (EVAP) Motronic Engine Control
Canister Purge Regulator Valve - Module (ECM) -J220- elec‐
N80- trical connector
electrical harness test box socket
connector terminal
2 64
Specified value: 1.5 Ω max.
If the specification is not obtained:
– Check the wiring for a short circuit to Battery positive (+) or an
open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the wiring connection.
If the specification was obtained:
– Replace the Motronic Engine
Protected Control
by copyright. Module
Copying (ECM)
for private -J220-
or commercial . in part or in whole, is not
purposes,
Refer to ⇒ page 130 .
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.4 Leak Detection Pump, Checking

Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
• The Leak Detection Pump (LDP) -V144- fuse OK.
• The ignition switched off.
Procedure
– Remove the left rear wheel housing liner. Refer to Body Ex‐
terior Repair Manual.

2. EVAP System 73
 A4 2002 ➤
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– Disconnect the Leak Detection Pump (LDP) -V144- electrical

harness connector -2-.
Checking internal resistance

– Using a Multimeter , check the Leak Detection Pump (LDP) -

V144- for resistance as follows:
Leak Detection Pump (LDP) -V144- Specified values
electrical harness connector termi‐
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
nals permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
-1- + -3- 640 to 720 Ω
-2- + -3- 15 to 17 Ω
If any of the specifications are not obtained:
– Replace the Leak Detection Pump (LDP) --V144-- . Refer to
Fuel Injection and Ignition Repair Manual.
If the specified values are obtained:
Checking voltage supply

Note

The voltage for the Leak Detection Pump (LDP) --V144-- is sup‐
plied via the Engine Control Module (ECM) -J220- .

– Check the Leak Detection Pump (LDP) --V144-- for voltage.

– Using a Multimeter , check the Leak Detection Pump (LDP) --

V144-- electrical harness connector terminal 3 for voltage.
Leak Detection Pump (LDP) --V144-- Measure to
electrical harness
connector terminal
-3- Engine Ground (GND)
– Operate the starter briefly.
Specified value: battery voltage.
– Switch the ignition off.
If the specified value was not obtained:

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 A4 2002 ➤
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– Using a Multimeter , check the Leak Detection Pump (LDP) --

V144-- electrical harness connector terminal 3 to the Fuel
Pump Relay -J17- terminal 2 for an open circuit.
Specified value: Wire resistance max 1.5 Ω.
If the specification is not obtained:
– Check the wiring for a short circuit to Battery positive (+) or an
open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Using a Multimeter , check the Leak Detection Pump (LDP) --
V144-- electrical connector terminal 1 to Motronic Engine Con‐
trol Module (ECM) -J220- electrical connector terminal 80 for
an open circuit.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. EVAP System 75
 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a Multimeter , check the Leak Detection Pump (LDP) --

V144-- electrical connector terminal 2 to Motronic Engine Con‐
trol Module (ECM) -J220- electrical connector terminal 25 for
an open circuit.
Leak Detection Pump (LDP) -- Motronic Engine Control
V144-- Module (ECM) -J220- elec‐
electrical harness trical connector terminals
connector terminals or test box socket
1 80
2 25
Specified value: 1.5 Ω max.
If the specification is not obtained:
– Check the wiring for a short circuit to Battery positive (+) or an
open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in wiring:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Assembly is performed in the reverse order of the removal, note
the following:
– Install the left rear wheel housing liner. Refer to Body Exterior
Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

76 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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3 Electronic Engine Power Control

System
⇒ “3.1 Function of EPC System”, page 77
⇒ “3.2 Throttle Position Sensor/Accelerator Pedal Position Sen‐
sor 2, Checking ”, page 77

3.1 Function of EPC System

For “EPC”, the throttle valve is not operated by a cable from the
accelerator pedal. There is no mechanical connection between
the accelerator pedal and the throttle valve.
The position of the accelerator pedal is communicated to Motronic
Engine Control Module (ECM) -J220- via Throttle Position (TP)
Sensor -G79- / Accelerator Pedal Position Sensor 2 -G185 - (var‐
iable resistances; stored in one housing) that are connected with
the accelerator pedal.
The accelerator pedal position (driver's intention) is a main input
unit for the Motronic Engine Control Module (ECM) -J220- .
Operation of the throttle valve occurs via an electric motor ( Throt‐
tle Drive (for Electronic Power Control (EPC)) -G186- ) in the
Throttle Valve Control Module - J338- . This is true across the
entire engine speed and engine load spectrum.
Throttle valve is operated by Throttle Drive (for Electronic Power
Control (EPC)) -G186- according to specifications of Motronic
Engine Control Module (ECM) -J220- .
With engine off and ignition switched on, Motronic Engine Control
Module (ECM) -J220- controls the Throttle Drive (for Electronic
Power Control (EPC)) - G186- exactly according to specifications
of Throttle Position (TP) Sensor -G79- / Accelerator Pedal Posi‐
tion Sensor 2 -G185 - .copyright.
Protected by This means,
Copying forifprivate
the accelerator pedalinispart or in whole, is not
or commercial purposes,
depressed halfpermitted
way, the Throttle
unless authorisedDrive
by AUDI(for
AG. Electronic
AUDI AG does notPower Con‐
guarantee or accept any liability
trol (EPC)) -G186- with opens
respect to the throttle ofvalve
the correctness to the
information in thissame degree;
document. Copyright by AUDI AG.
i.e. throttle valve is then opened approx. half way.
With engine running (under load), Motronic Engine Control Mod‐
ule (ECM) -J220- can open or close the throttle valve independ‐
ently of Throttle Position (TP) Sensor -G79- / Accelerator Pedal
Position Sensor 2 -G185- .
This means, for example, that the throttle valve could be fully
opened even though the accelerator pedal has only been de‐
pressed half way. This has the advantage of preventing torque
losses at the throttle valve.
In addition to this, it results in significantly better values relative
to emissions and consumption under certain load conditions.
It would be incorrect to think that “EPC” consists of only one or
two components. “EPC” is much more of a system containing all
components that contribute to recognizing, controlling and moni‐
toring the position of the throttle valve.
– Observe all safety precautions.
– Observe the rules for cleanliness.

3.2 Throttle Position Sensor/Accelerator

Pedal Position Sensor 2, Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram

3. Electronic Engine Power Control System 77

 A4 2002 ➤
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Test requirement
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.

Note

Use only gold-plated terminals when servicing the electrical har‐

ness connector terminals in Throttle Position (TP) Sensor -G79- /
Accelerator Pedal Position Sensor 2 -G185- .

Test sequence
– Remove the drivers side storage compartment. Refer to Body
Interior Repair Manual.

– Disconnect the Throttle Position (TP) Sensor -G79- / Acceler‐

ator Pedal Position Sensor 2 -G185- 6-pin electrical harness
connector -2-.
Checking voltage supply and wiring
– Switch the ignition on.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

78 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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– Using a Multimeter , check the following wiring connections for

voltage.
Throttle Position (TP) Sensor -G79- / Ac‐ Specified value
celerator Pedal Position Sensor 2 -G185-
electrical harness connector terminals
1 to Ground (GND) about 5 V
1 to 5 about 5 V
2 to Ground (GND) about 5 V
2 to 3 about 5 V
– Switch the ignition off.
If the specification was not obtained:
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

3. Electronic Engine Power Control System 79

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a Multimeter , check the Throttle Position (TP) Sensor -

G79- / Accelerator Pedal Position Sensor 2 -G185- electrical
harness connector terminals to the Motronic Engine Control
Module (ECM) -J220- electrical connector for an open circuit.
Throttle Position (TP) Sensor - Motronic Engine Control
G79- / Accelerator Pedal Posi‐ Module (ECM) -J220- electri‐
tion Sensor 2 -G185- cal connector
electrical harness connector test box sockets
terminals
1 72
2 73
3 36
4 35
5 33
6 34
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Specified value: 1.5 Ω max.with respect to the correctness of information in this document. Copyright by AUDI AG.
If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
– Replace the Throttle Position (TP) Sensor -G79- / Accelerator
Pedal Position Sensor 2 -G185- . Refer to Fuel Injection and
Ignition Repair Manual.
If no malfunction is detected in the wiring and if the voltage supply
was not OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the drivers side storage compartment. Refer to Body
Interior Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

80 Rep. Gr.20 - Fuel Supply

 A4 2002 ➤
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21 – Turbocharger, G-Charger
1 Turbocharger
⇒ “1.1 Safety Precautions”, page 82
⇒ “1.2 Clean Working Conditions”, page 82
⇒ “1.3 Turbocharger Recirculating Valve, Checking”, page 83
⇒ “1.4 Wastegate Bypass Regulator Valve, Checking”,
page 85
For all Turbocharger, G-Charger component locations. Refer to
Engine Mechanical Repair Manual.
For all Turbocharger, G-Charger removal/installation procedures
and torque specifications. Refer to Engine Mechanical Repair
Manual
Check the Technical Bulletins for information that may supersede
any information included in this manual.

Note

♦ All manufacturers special tools as well as common tools may

contain a manufacturer specific part number. These tools may
be substituted with an equivalent aftermarket tool or are avail‐
able for purchase through Audi. Refer to ⇒ Tool catalog .
♦ Manufacturers special tools as well as common tools that con‐
tain a manufacturer specific part number may be referenced
in the test procedure illustrations showing the tool use or in‐
stallation. If the manufacturer specific tool is not being used,
an equivalent aftermarket tool may be installed in the same
manner as the manufacturers special tool.
♦ The manufacturers test box Test Box 105 Pin -VAG1598/31-
is available for purchase or rental.
unless Refer tobythe ⇒AG.
Tool catalog . guarantee or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted authorised AUDI AUDI AG does not
with respect to the correctness of information in this document. Copyright by AUDI AG.
General Notes
♦ Charge air system must be properly sealed.
♦ Always replace self-locking nuts.
♦ Charge air hoses and pipes as well as their connections must
be free of oil and grease before re-installing.
♦ Do not assemble charge air hoses and lines with lubricants
containing oils, only coat with water (without additives) if nec‐
essary.
♦ Note installation marks on hoses and components.
♦ All hose connections for charge air system are secured by
spring-type clamps or by connector couplings.
♦ Install only approved clamps for securing hose connections ⇒
Electronic Parts Catalog“ETKA” .
♦ Pliers for spring clamps -VAS 5024 A- or Hose clamp pliers -
V.A.G 1921- are recommended for installing spring clamps.
♦ For connector couplings, always note the following points:
– Disengage connector coupling by pulling securing clip
-arrow-.
– Disconnect hose and pipe without the assistance of tools.

1. Turbocharger 81
 A4 2002 ➤
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– When assembling, make sure the retaining tabs -A- are en‐
gaged securely.
♦ Before screwing on oil supply line, fill turbocharger with engine
oil at filler tube.
♦ After installing turbocharger, let engine idle for approx. 1 mi‐
nute without increasing engine speed. This ensures adequate
oil supply to the turbocharger.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1.1 Safety Precautions

Caution

Observe the following for all installations, especially in engine

compartment due to lack of room:
♦ Route lines of all types (e.g. for fuel, hydraulic, EVAP can‐
ister system, coolant and refrigerant, brake fluid, vacuum)
and electrical wiring so that the original path is followed.
♦ Watch for sufficient clearance to all moving or hot compo‐
nents.

If special testing equipment is required during road test, note the

following:

WARNING

♦ Test equipment must always be secured to the rear seat

and operated from there by a second person.
♦ If test and measuring equipment is operated from the pas‐
senger seat, the person seated there could be injured in the
event of an accident involving deployment of the passen‐
ger-side airbag.

WARNING

The use of nails, paper clips, or another unauthorized materials

to back-probe electrical harness connectors is strictly prohibi‐
ted and may cause damage to the electrical harness connec‐
tors, terminal ends or damage to a component. Use only the
manufacturers test lead kit or an equivalent aftermarket test
lead kit for back-probing all electrical harness connectors.

1.2 Clean Working Conditions

When working on turbocharger, carefully observe the following
Clean Working Conditions:
♦ Thoroughly clean all connections and the surrounding area
before disconnecting.
♦ Place parts that have been removed on a clean surface and
cover. Use lint-free cloths only!
♦ Carefully cover over opened components or seal, if repairs are
not carried out immediately.

82 Rep. Gr.21 - Turbocharger, G-Charger

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♦ Only install clean components: Only unpack replacement

parts immediately prior to installation. Do not use parts that
have been stored loose (in tool boxes etc.)
♦ Transport and protective packaging and sealing caps are to
be removed only immediately prior to installation.
♦ During repairs, clean oil from connections and hose ends.
♦ When the system is open: Avoid working with compressed air
if possible. Do not move vehicle unless absolutely necessary.

1.3 Turbocharger Recirculating Valve,

Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• The Motronic Engine Control
permitted Module
unless authorised(ECM) - J220-
by AUDI AG. fuses
AUDI AG OK.
does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• On vehicles with automatic transmission, selector lever in po‐
sition “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Checking internal resistance

– Disconnect the Turbocharger Recirculating Valve -N249- elec‐

trical harness connector-2-.

1. Turbocharger 83
 A4 2002 ➤
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– Using a multimeter , check the Turbocharger Recirculating

Valve -N249- terminals 1 to 2 for resistance.
Specified value: 20 to 30 Ω (at approx. 20° C)
If the specification was not obtained:
– Replace the Turbocharger Recirculating Valve -N249- Refer
to Engine Mechanical Repair Manual.
If the specification was obtained:
Checking Voltage supply

– Using a multimeter , check the Turbocharger Recirculating

Valve -N249- electrical harness connector terminal 1 to
Ground (GND).
Turbocharger Recirculating Valve -N249- Measure to
electrical harness
connector terminal Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
1 with respect to the correctnessEngine Ground
of information in this document. Copyright by AUDI AG.
(GND)
– Operate the starter briefly.
Specified value: battery voltage.
– Switch the ignition off.
If the specified value was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

84 Rep. Gr.21 - Turbocharger, G-Charger

 A4 2002 ➤
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– Using a multimeter , check the Turbocharger Recirculating

Valve -N249- electrical harness connector terminal 2 to Mo‐
tronic Engine Control Module (ECM) -J220- electrical harness
connector terminal 105 for an open circuit.
Turbocharger Recirculating Motronic Engine Control Module
Valve -N249- (ECM) -J220- electrical connec‐
electrical harness tor
connector terminal test box socket
2 105
Specified value: 1.5 Ω max.
If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the engine cover with air filter. Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

1.4 Wastegate Bypass Regulator Valve,

Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Turbocharger 85
 A4 2002 ➤
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Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• On vehicles with automatic transmission, selector lever in po‐
sition “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Checking internal resistance

– Disconnect the Wastegate Bypass Regulator Valve -N75-

electrical harness connector-1-.

– Using a multimeter , check the Wastegate Bypass Regulator

Valve -N75- terminals 1 to 2 for resistance.
Specified value: 20 to 30 Ω (at approx. 20° C)
If the specification was not obtained:
– Replace the Wastegate Bypass Regulator Valve -N75- Refer
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
to Engine Mechanical
permitted unless Repair
authorised by AUDI Manual.
AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If the specification is obtained:
Checking Voltage supply

86 Rep. Gr.21 - Turbocharger, G-Charger

 A4 2002 ➤
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– Using a multimeter , check the Wastegate Bypass Regulator

Valve -N75- electrical harness connector terminal 1 to Ground
(GND).
Wastegate Bypass Regulator Measure to
Valve -N75-
electrical harness
connector terminal
1 Engine Ground (GND)
– Operate the starter briefly.
Specified value: battery voltage.
– Switch the ignition off.
If the specification was not obtained:
– Check the wiring for a short circuit to Battery positive (+) or an
open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the wiring connection.
If no malfunction is found in the wiring:
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to chapter ⇒ page 130
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Turbocharger 87
 A4 2002 ➤
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– Using a multimeter , check the Wastegate Bypass Regulator

Valve -N75- electrical harness connector terminal 2 to the Mo‐
tronic Engine Control Module (ECM) -J220- electrical harness
connector 104 for an open circuit.
Wastegate Bypass Regulator Motronic Engine Control Module
Valve. -N75- (ECM) -J220- electrical connec‐
electrical harness tor test box socket
connector terminal
2 104
Specified value: 1.5 Ω max.
If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

88 Rep. Gr.21 - Turbocharger, G-Charger

 A4 2002 ➤
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2 Charge Air System

⇒ “2.1 Safety Precautions”, page 89
⇒ “2.2 Clean Working Conditions”, page 90
⇒ “2.3 Charge Air Pressure Sensor, Checking”, page 90
General Information
♦ Charge air system must be properly sealed.
♦ Always replace self-locking nuts.
♦ Charge air hoses and pipes as well as their connections must
be free of oil and grease before re-installation.
♦ Do not assemble charge air hoses and pipes with lubricants
containing oils, only coat with water (without additives) if nec‐
essary.
♦ Note installation marks on hoses and components.
♦ All hose connections for charge air system are secured by
spring-type clamps or by connector couplings.
♦ Install only approved clamps for securing hose connections ⇒
Electronic Parts Catalog“ETKA” .
♦ Spring Type Clip Pliers or Hose clamp pliers are recommen‐
ded for installing spring clamps.
♦ For connector couplings, always note the following points:
– Release connector coupling by pulling securing clip -arrow-.
– Disconnect the hose and line without the assistance of tools.
– When assembling, make sure the retaining tabs -A- are en‐
gaged securely.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2.1 Safety Precautions

Caution

Observe the following for all installations, especially in engine

compartment due to lack of room:
♦ Route lines of all types (e.g. for fuel, hydraulic, EVAP can‐
ister system, coolant and refrigerant, brake fluid, vacuum)
and electrical wiring so that the original path is followed.
♦ Watch for sufficient clearance to all moving or hot compo‐
nents.

If special testing equipment is required during road test, note the

following:

2. Charge Air System 89

 A4 2002 ➤
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WARNING

♦ Test equipment must always be secured to the rear seat

and operated from there by a second person.
♦ If test and measuring equipment is operated from the pas‐
senger seat, the person seated there could be injured in the
event of an accident involving deployment of the passen‐
ger-side airbag.

WARNING

The use of nails, paper clips, or another unauthorized materials

to back-probe electrical harness connectors is strictly prohibi‐
ted and may cause damage to the electrical harness connec‐
tors, terminal ends or damage to a component. Use only the
manufacturers test lead kit or an equivalent aftermarket test
lead kit for back-probing all electrical harness connectors.

2.2 Clean Working Conditions

When working on turbocharger, carefully observe the following
Clean Working Conditions:
♦ Thoroughly clean all connections and the surrounding area
before disconnecting.
♦ Place parts that have been removed on bya copyright.
Protected clean surface
Copying forand
private or commercial purposes, in part or in whole, is not
cover. Use lint-free cloths only! permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Carefully cover over opened components or seal, if repairs are
not carried out immediately.
♦ Only install clean components: Only unpack replacement
parts immediately prior to installation. Do not use parts that
have been stored loose (in tool boxes etc.)
♦ Transport and protective packaging and sealing caps are to
be removed only immediately prior to installation.
♦ During repairs, clean oil from connections and hose ends.
♦ When the system is open: Avoid working with compressed air
if possible. Do not move vehicle unless absolutely necessary.

2.3 Charge Air Pressure Sensor, Checking

Note

Use only gold-plated terminals when servicing terminals in har‐

ness connector of Charge Air Pressure Sensor -G31- .

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.

90 Rep. Gr.21 - Turbocharger, G-Charger

 A4 2002 ➤
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Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• On vehicles with automatic transmission, selector lever in po‐
sition “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.

Test sequence
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Disconnect the Charge Air Pressure Sensor -G31- electrical

harness connector -arrow-.
– Start engine and let it run at idle.

– Using a multimeter , check the Charge Air Pressure Sensor -

G31- electrical harness connector terminals 1 to 3 for voltage.
Specified value: min. 4.5 V
– Switch the ignition off.
If the specification was not obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

2. Charge Air System 91

 A4 2002 ➤
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– Using a multimeter , check the Charge Air Pressure Sensor -

G31- electrical harness connector terminals to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector terminals for an open circuit according to wiring dia‐
gram.
Charge Air Pressure Sen‐ Motronic Engine Control Module
sor -G31- (ECM) -J220- electrical connector
electrical harness test box sockets
connector terminals
1 108
3 98
4 101
Specified value: 1.5 Ω max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– If necessary, repair the faulty wiring connection.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
– Replace the Charge Air Pressure Sensor -G31- Refer to En‐
gine Mechanical Repair Manual.
If no malfunction is detected in the wiring and if the voltage supply
was not OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of Protected
diagnosis.
by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

92 Rep. Gr.21 - Turbocharger, G-Charger

 A4 2002 ➤
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24 – Multiport Fuel Injection

1 Fuel Injection System, Servicing
⇒ “1.1 Safety Precautions”, page 93
⇒ “1.2 Clean Working Conditions”, page 94
⇒ “1.3 Technical Data”, page 94
For all Motronic fuel injection system component locations. Refer
to Fuel Injection and Ignition Repair Manual
For all Motronic fuel injection system removal/installation proce‐
dures and torque specifications. Refer to Fuel Injection and Igni‐
tion Repair Manual
Check the Technical Bulletins for information that may supersede
any information included in this manual.

Note

♦ All manufacturers special tools as well as common tools may

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

contain a manufacturer specific part number. These tools may in this document. Copyright by AUDI AG.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information
be substituted with an equivalent aftermarket tool or are avail‐
able for purchase through Audi. Refer to the ⇒ Tool catalog .
♦ Manufacturers special tools as well as common tools that con‐
tain a manufacturer specific part number may be referenced
in the test procedure illustrations showing the tool use or in‐
stallation. If the manufacturer specific tool is not being used,
an equivalent aftermarket tool may be installed in the same
manner as the manufacturers special tool.
♦ The manufacturers test box Test Box 105 Pin -VAG1598/31-
is available for purchase or rental. Refer to the ⇒ Tool catalog .

1.1 Safety Precautions

To reduce the risk of personal injury and/or damage to the fuel
injection and ignition system. Note the following:

Caution

The fuel system is pressurized. Before loosening hose con‐

nections or opening the test connection (to measure fuel pres‐
sure), place a cloth around the connection. Then release
pressure by carefully loosening the connection.

♦ Always switch off ignition before disconnecting or connecting

lines of the fuel injection and ignition system, including test
leads.
♦ During some of the tests, a Diagnostic Trouble Code (DTC)
may be recognized and stored by the control module. At the
end of all tests and repairs, the DTC memory should be
checked and, if necessary, erased. After erasing the DTC
memory, a readiness code must be generated for the engine
control module.
♦ Always switch ignition off before cleaning engine.

1. Fuel Injection System, Servicing 93

 A4 2002 ➤
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Caution

♦ The battery must only be disconnected and connected with

the ignition switched off, since the Engine Control Module
(ECM) can otherwise be damaged.
♦ Observe procedures for disconnecting battery.

Observe the following if test and measuring instruments are re‐

quired during a test drive

Caution

♦ Test and measuring equipment must always be secured to

the rear seat and be operated from there by a second per‐
son. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

♦ If test and measuring instruments are withoperated

respect to from the of information in this document. Copyright by AUDI AG.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
the correctness
front passenger's seat and the vehicle is involved in an ac‐
cident, there is a possibility that the person sitting in this
seat may receive serious injuries when the airbag is de‐
ployed.

WARNING

The use of nails, paper clips, or another unauthorized materials

to back-probe electrical harness connectors is strictly prohibi‐
ted and may cause damage to the electrical harness connec‐
tors, terminal ends or damage to a component. Use only the
manufacturers test lead kit or an equivalent aftermarket test
lead kit for back-probing all electrical harness connectors.

1.2 Clean Working Conditions

Even minor contaminations can lead to malfunctions in the fuel
injection system. When working on the fuel supply/injection sys‐
tem, pay careful attention to the following rules for cleanliness:
♦ Thoroughly clean all unions and adjacent areas with engine or
brake cleaner and dry before disconnecting.
♦ Plug open lines and connections immediately with appropriate
protective caps.
♦ Place removed parts on a clean surface and cover. Use lint-
free cloths.
♦ Install clean components: Remove replacement parts imme‐
diately prior to installation. Do not use parts that have been
stored unpacked (e.g. in tool boxes etc.).
♦ When the system is open: Do not work with compressed air.
Do not move vehicle unless absolutely necessary.
♦ Separated electrical connectors: Protect from dirt and mois‐
ture. Make sure connections are dry when reconnecting.

1.3 Technical Data

Engine Code AMB
Idle speed (not adjustable) 700-860 RPM
Engine Control Module (ECM)
System identification Motronic ME 7

94 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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Engine Code AMB

Terminals at Engine Control Module (ECM) 121
Replacement part number ⇒ ETKA (electronic parts catalog)
Engine speed (RPM) limitation approx. 6800 RPM

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Fuel Injection System, Servicing 95

 A4 2002 ➤
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2 Components, Checking
⇒ “2.1 Oxygen Sensor Heater before Catalytic Converter, Check‐
ing”, page 96
⇒ “2.2 Oxygen Sensor after Catalytic Converter, Checking Heat‐
er”, page 98
⇒ “2.3 Mass Air Flow Sensor, Checking”, page 101
⇒ “2.4 Throttle Valve Control Module, Checking”, page 104
⇒ “2.5 Engine Coolant Temperature Sensor, Checking”,
page 107
⇒ “2.6 Intake Air Temperature, Checking”, page 111
⇒ “2.7 Engine Speed Sensor, Checking”, page 115
⇒ “2.8 Fuel Injectors, Checking”, page 118

2.1 Oxygen Sensor Heater before Catalytic

Converter, Checking

Note

When servicing terminals in harness connector of Oxygen Sensor

(O2S) Heater -Z19- , use only gold-plated terminals.

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.
Test requirements
• The Oxygen Sensor (O2S) Heater -Z19- fuse OK.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• Battery voltage at least 12.5 volts. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter. Refer to Fuel Injection
and Ignition Repair Manual.
Checking internal resistance

96 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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– Disconnect the Oxygen Sensor (O2S) Heater -Z19- electrical

harness connector -5-.

– Using a multimeter , check the Oxygen Sensor (O2S) Heater

-Z19- terminals 3+4 for an open circuit.
Specified value: 2.5 to 10.0 Ω (at approx. 20° C)
If the specification was not obtained:
– Replace the Oxygen Sensor (O2S) Heater -Z19- . Refer to
Fuel Injection and Ignition Repair Manual.
If the specification is obtained:
Checking voltage supply

– Using a multimeter , check the Oxygen Sensor (O2S) Heater

-Z19- electrical harness connector terminal 4 to the Fuel Pump
(FP) Relay -J17- terminal 2 for voltage.
Oxygen Sensor (O2S) Heater Fuel Pump (FP) Relay -J17-
-Z19- electrical harness electrical harness
connector terminal connector terminal
4 2
Specified value: Battery voltage.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test boxunless
is not beingbyused. Perform the not
fol‐
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted authorised AUDI AG. AUDI AG does guarantee or accept any liability
lowing step. with respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove the Motronic Engine Control Module (ECM) -J220- .

Refer to ⇒ page 130 .

2. Components, Checking 97
 A4 2002 ➤
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– Using a multimeter , check the Oxygen Sensor (O2S) Heater

-Z19- electrical harness connector terminal 4 to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector terminal 5 for an open circuit.
Oxygen Sensor (O2S) Heater Motronic Engine Control Mod‐
-Z19- ule (ECM) -J220- electrical con‐
electrical harness nector test box socket
connector terminal
4 5
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Specified value: 1.5 Ω
permitted max.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the engine cover with air filter. Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.2 Oxygen Sensor after Catalytic Convert‐

er, Checking Heater

Note

♦ Vehicle must be raised before electrical harness connector for

the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Con‐
verter (TWC)) Heater -Z29- is accessible.
♦ When servicing terminals in harness connector of Oxygen
Sensor (O2S) 1 (behind Three Way Catalytic Converter
(TWC)) Heater -Z29- , use only gold-plated terminals.

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.

98 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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Test requirements
• The Oxygen Sensor (O2S) 1 (behind Three Way Catalytic
Converter (TWC)) Heater -Z29- fuse OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Test sequence

– Remove the right vehicle floor cover -arrows-.

Checking internal resistance

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Disconnect the Oxygen Sensor (O2S) 1 (behind Three Way

Catalytic Converter (TWC)) Heater -Z29- electrical harness
connector -2-.

2. Components, Checking 99
 A4 2002 ➤
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– Using a multimeter , check the Oxygen Sensor (O2S) 1 (be‐

hind Three Way Catalytic Converter (TWC)) Heater -Z29-
electrical harness connector terminals 1 to 2 for resistance.
Specified value: 1.0 to 20.0 Ω (at approx. 20° C)
If the specification was not obtained:
– Replace the Oxygen Sensor (O2S) 1 (behind Three Way Cat‐
alytic Converter (TWC)) Heater -Z29- . Refer to Fuel Injection
and Ignition Repair Manual.
If the specification was obtained:
Checking voltage supply
– Using a multimeter , check the Oxygen Sensor (O2S) 1 (be‐
hind Three Way Catalytic Converter (TWC)) Heater -Z29-
electrical harness connector terminal 1 to Fuel Pump Relay -
J17- terminal 2 for an open circuit.
Oxygen Sensor (O2S) 1 (be‐ Fuel Pump Relay -J17-
hind Three Way Catalytic electrical harness
Converter (TWC)) Heater - connector terminal
Z29-
electrical harness
connector terminal
1 2
– Turn key on:
Specified value: 12.5Battery voltage.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Protected
Check the electrical harness connector for damage, corrosion,
by copyright. Copying for private or commercial purposes, in part or in whole, is not
lose or
permitted broken
unless terminals.
authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– If necessary, repair the faulty wiring connection.
– Turn key off.
If the specification was obtained:
Checking Ground (GND) activation
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

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– Using a multimeter , check the Oxygen Sensor (O2S) 1 (be‐

hind Three Way Catalytic Converter (TWC)) Heater -Z29-
electrical harness connector terminal 2 to the Motronic Engine
Control Module (ECM) -J220- electrical harness connector
terminal 63 for an open circuit according to the wiring diagram.
Oxygen Sensor (O2S) 1 (be‐ Motronic Engine Control Mod‐
hind Three Way Catalytic ule (ECM) -J220- electrical con‐
Converter (TWC)) Heater - nector test box socket
Z29-
electrical harness
connector terminal
2 63
Specified value: 1.5 Ω max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the right vehicle floor cover.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.3 Mass Air Flow Sensor, Checking

Note

Use only gold-plated terminals when servicing terminals in har‐

ness connector of Mass Air Flow (MAF) Sensor -G70- .

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.
♦ Scan tool

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Components, Checking 101

 A4 2002 ➤
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Test requirements
• The Mass Air Flow (MAF) Sensor -G70- fuse OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Coolant Temperature at least 80° C.
• Ignition switched off.
Function test
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Connect the scan tool. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Start engine and let it run at idle.
– Using the scan tool, Check the air flow quantity of the Mass
Air Flow (MAF) Sensor -G70- at idle:
Diagnostic text Specified value
Air flow quantity at Mass Air Flow
(MAF) sensor
• Engine running at idle 2.00 to 5.00 g/sec

– End diagnosis and switch ignition off.

If specified value is obtained, but DTC memory has a DTC con‐
cerning Mass Air Flow (MAF) Sensor -G70- :
– Check voltage supply of Mass Air Flow (MAF) Sensor -G70-
⇒ page 102 .
If specified value was not obtained:
– Check the Mass Air Flow (MAF) Sensor -G70- electrical circuit
⇒ page 103 .
Checking voltage supply

– Disconnect the Mass Air Flow (MAF) Sensor -G70- electrical

harness connector -1-.
– Start the engine and let it run at idle.

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 A4 2002 ➤
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– Using a multimeter , check the Mass Air Flow (MAF) Sensor -

G70- electrical harness connector terminal 3 to engine Ground
(GND).
Specified value: battery voltage.
– Switch the ignition off.
If specified value was not obtained:
– Check the Mass Air Flow (MAF) Sensor -G70- electrical har‐
ness connector terminal 3 to the Fuel Pump Relay -J17-
terminal 2 for an open circuit. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Specified value: 1.5 Ω max. with respect to the correctness of information in this document. Copyright by AUDI AG.

If no malfunction is detected in the wiring and if the voltage supply

was OK:
Checking electrical circuit
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

2. Components, Checking 103

 A4 2002 ➤
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– Using a multimeter , check the Mass Air Flow (MAF) Sensor -

G70- electrical harness connector terminals to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector terminals for an open circuit.
Mass Air Flow (MAF) Sensor - Motronic Engine Control Mod‐
G70- ule (ECM) -J220- electrical con‐
electrical harness nectortest box socket
connector terminals
4 53
5 29
3 27
Specified value: 1.5 Ω max.
If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply
was OK: Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Replace MasswithAir Flow (MAF) Sensor -G70- . Refer to Fuel
respect to the correctness of information in this document. Copyright by AUDI AG.

Injection and Ignition Repair Manual.

If no malfunction is detected in the wiring and if the voltage supply
was not OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.4 Throttle Valve Control Module, Check‐

ing

Note

Use only gold-plated terminals when servicing terminals in har‐

ness connector of Throttle Valve Control Module -J338- .

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.

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Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

chassis OK.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

• Throttle valve must not be damaged or dirty.

• Coolant Temperature at least 80° C.
Function
Throttle valve operation occurs by an electric motor ( Throttle
Drive (for Electronic Power Control (EPC)) -G186- ) in the Throttle
Valve Control Module - J338- . It is operated by the Motronic En‐
gine Control Module (ECM) -J220- and the Throttle Position (TP)
Sensor -G79- / Accelerator Pedal Position Sensor 2 -G185- .
The Throttle Valve Control Module -J338- is made up of the fol‐
lowing components:
♦ Throttle Drive (for Electronic Power Control (EPC)) -G186-
♦ Throttle Drive Angle Sensor 1 (for Electronic Power Control
(EPC)) -G187-
♦ Throttle Drive Angle Sensor 2 (for Electronic Power Control
(EPC)) -G188-
The Throttle Valve Control Module -J338- cannot be serviced
separately and must be serviced as a unit.
Function test
– Connect the scan tool.
– Switch ignition on.
– Using the scan tool, check the throttle valve position (absolute)
at idle stop:
Diagnostic text Specified value
Throttle valve position (absolute)
• Idle stop 3.0 to 25.0%

– Slowly depress the accelerator pedal to Wide Open Throttle

(WOT) stop while observing the percentage display. The per‐
centage display must increase uniformly.
– Using the scan tool, check the throttle valve position (absolute)
at Wide Open Throttle (WOT) stop:
Diagnostic text Specified value
Throttle valve position (absolute)
• Wide Open Throttle (WOT) stop 84.0 to 97.0%

– End diagnosis and switch ignition off.

If the specified values are not obtained:

2. Components, Checking 105

 A4 2002 ➤
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– Remove the Throttle Valve Control Module -J338 - far enough

so that the electrical connector terminals are reached.

– Disconnect the Throttle Valve Control Module -J338- electrical

harness connector -arrow-.
Checking resistance

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Using a multimeter , check the Throttle Drive (for Electronic

Power Control (EPC)) -G186- at the Throttle Valve Control
Module -J338- terminals 3 to 5 for resistance.
Specified value: 1.0 to 5.0 Ω (at 20° C)
If the specification was not obtained:
– Replace the Throttle Valve Control Module - J338- . Refer to
Fuel Injection and Ignition Repair Manual.
If the specification was obtained:
– Check the voltage supply of the Throttle Valve Control Module
-J338- to the Motronic Engine Control Module (ECM) -J220- .
– ⇒ page 77 .
Checking voltage supply and wiring
– Switch the ignition on.

– Using a Multimeter , check the Throttle Drive (for Electronic

Power Control (EPC)) -G186- at the Throttle Valve Control
Module -J338- electrical harness connector terminals 2 to 6
for voltage.
Specified value: at least 4.5 V
– Switch the ignition off.
If the specification was not obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

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 A4 2002 ➤
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– Using a Multimeter , check the Throttle Drive (for Electronic

Power Control (EPC)) -G186- at Throttle Valve Control Module
-J338- electrical harness connector terminals to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector terminals for an open circuit according to the wiring
diagram.
Throttle Valve Control Motronic Engine Control Module
Module -J338- (ECM) -J220- electrical connector
electrical harness test box socket
connector terminals
1 92
2 83
3 117
4 84
5 118
6 91
Specified value: 1.5 Ω max.
If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– If necessary, repair the faulty wiring connection.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
If no malfunction is detected in the wiring and if the voltage supply
was not OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
3- If the DTC memory was erased, generate
permittedreadiness code.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Refer to ⇒ page 18 . with respect to the correctness of information in this document. Copyright by AUDI AG.

– End of diagnosis.

2.5 Engine Coolant Temperature Sensor,

Checking

WARNING

♦ Cooling system is under pressure.

♦ Danger of scalding when opening!

Note

Use only gold-plated terminals when servicing terminals in the

electrical harness connector of Engine Coolant Temperature
(ECT) Sensor -G2- .

2. Components, Checking 107

 A4 2002 ➤
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Special tools and workshop equipment required

♦ Multimeter .
♦ jumper wire .
♦ Wiring diagram.
Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND)Protected
connections between engine/transmission/
by copyright. Copying for private or commercial purposes, in part or in whole, is not

chassis OK.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

• Ignition switched off.

• Engine cold.
Function test
– Connect the scan tool.
– Switch the ignition on.
– Using the scan tool, check the coolant temperature:
Diagnostic text Specified value
Coolant temperature Approx. coolant temper‐
ature
If the specified value is not obtained:
– Continue test according to the following table:
Indicated Cause Test
approx. - Open circuit or short circuit ⇒ page 109
40.0° C to (B+)
approx. Short circuit to Ground ⇒ page 110
140.0° C (GND)
If the specified value was obtained:
– Start the engine and let it run at idle.
The temperature value must increase uniformly in increments of
1.0° C.
If the engine shows problems in certain temperature ranges and
if the temperature does not climb uniformly, the temperature sig‐
nal is intermittent.
– Replace the the Engine Coolant Temperature (ECT) Sensor -
G2- Refer to Fuel Injection and Ignition Repair Manual.
Checking internal resistance

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 A4 2002 ➤
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– Disconnect the Engine Coolant Temperature (ECT) Sensor -

G2- electrical harness connector -arrow-.

– Using a multimeter , check the Engine Coolant Temperature

(ECT) Sensor -G2- terminals 1 to 2 for resistance.
Use the chart below for the specified values:
♦ Area A: Resistance values 0 to 50° C.
♦ Area B: Resistance values 50 to 100° C.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Specified values:
♦ Range A, 30° C equals a resistance of 1.5 to 2.0 kΩ
♦ Range B, 80° C equals a resistance of 275 to 375Ω
If any of the specified values was not obtained:
– Replace the Engine Coolant Temperature (ECT) Sensor - G2-
Refer to Fuel Injection and Ignition Repair Manual.
Testing if display is approx. - 40.0° C

– Disconnect the Engine Coolant Temperature (ECT) Sensor -

G2- electrical harness connector -arrow-.
– Using a jumper wire , connect the Engine Coolant Tempera‐
ture (ECT) Sensor -G2- electrical harness connector terminals
1 to 2.

2. Components, Checking 109

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Check the value indicated on the scan tool display.

If the value jumps to approx. 140.0° C
– End diagnosis and switch the ignition off.
– Replace the Engine Coolant Temperature (ECT) Sensor - G2-
Refer to Fuel Injection and Ignition Repair Manual.
If indication remains at approx. -40.0° C:
Testing if display approx. 140.0° C

– Disconnect the Engine Coolant Temperature (ECT) Sensor -

G2- electrical harness connector -arrow-.
If indication jumps to approx. -40.0° C:
– End diagnosis and switch ignition off.
– Replace the Engine Coolant Temperature (ECT) Sensor - G2-
Refer to Fuel Injection and Ignition Repair Manual.
If indication remains at approx. 140.0° C:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

110 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a Multimeter , check the Engine Coolant Temperature

(ECT) Sensor - G2- electrical harness connector terminals to
the Motronic Engine Control Module (ECM) -J220- electrical
harness connector terminals for an open circuit according to
the wiring diagram.
Engine Coolant Tempera‐ 32pin connector (blue) of -J285-
ture (ECT) Sensor - G2- control module in intst. cluster
electrical harness
connector terminals
2 Pin 2
1 Gnd
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Specified value: 1.5 Ω Max. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.6 Intake Air Temperature, Checking

Note

Use only gold-plated terminals when servicing terminals in the

electrical harness connector of the Intake Air Temperature (IAT)
Sensor -G42- .

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.
♦ Cool spray (commercially available).

2. Components, Checking 111

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Function test
– Connect the scan tool.
– Switch the ignition on.
– Using the scan tool, check the intake air temperature:
Diagnostic text Specified value
Intake Air Temperature (IAT) approx. ambient air tem‐
perature
If the specified value is not obtained:
– Continue the test according to the following table:
Indicated Cause Test
approx. -40° C Open circuit or short cir‐ ⇒ page 113
or cuit to (B+)
approx. -46° C
approx. 140° C Short circuit to Ground ⇒ page 114
(GND)
If the specified values are obtained:
– Remove the Intake Air Temperature (IAT) Sensor -G42- Refer
to Fuel Injection and Ignition Repair Manual.
– Spray the Intake Air Temperature (IAT) Sensor -G42- with a
commercially available cool spray while observing the tem‐
perature value on the scan tool.
The temperature value must decrease.
– End diagnosis and switch the ignition off.
If the intake air temperature does not decrease:
– Replace the Intake Air Temperature (IAT) Sensor -G42- Refer
to Fuel Injection and Ignition Repair Manual.
If the intake air temperature
Protected does
by copyright. Copying for decrease:
private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Checking internal resistance
with respect to the correctness of information in this document. Copyright by AUDI AG.

112 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Disconnect the Intake Air Temperature (IAT) Sensor -G42-

electrical harness connector -arrow-.

– Using a multimeter , check the Intake Air Temperature (IAT)

Sensor -G42- terminals 1 to 2 for resistance.
Use the chart below for the specified values:
♦ Area A: Resistance values 0 to 50° C. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

♦ Area B: Resistance values 50 to 100° C.

with respect to the correctness of information in this document. Copyright by AUDI AG.

Specified values:
Read-out examples:
♦ Range A, 30° C equals a resistance of 1.5 to 2.0 kΩ
♦ Range B, 80° C equals a resistance of 275 to 375Ω
If any of the specified values are not obtained:
– Replace the Intake Air Temperature (IAT) Sensor -G42- Refer
to Fuel Injection and Ignition Repair Manual.
Testing if display approx. -40° C or approx. -46° C:

– Disconnect the Intake Air Temperature (IAT) Sensor -G42-

electrical harness connector -arrow-.
– Using a jumper wire , connect the Intake Air Temperature (IAT)
Sensor -G42- electrical harness connector terminals 1 to 2.

2. Components, Checking 113

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Check the value indicated on the scan tool display.

If indication jumps to approx. 140° C:
– End diagnosis and switch ignition off.
– Replace the Intake Air Temperature (IAT) Sensor -G42- Refer
to Fuel Injection and Ignition Repair Manual.
If indication remains at approx. -40° C or -46° C:
Testing if display approx. 140° C:

– Disconnect the Intake Air Temperature (IAT) Sensor -G42-

electrical harness connector -arrow-.
If indication jumps to approx. -40° C or -46° C:
– End diagnosis and switch ignition off.
– Replace the Intake Air Temperature (IAT) Sensor -G42 - Refer
to Fuel Injection and Ignition Repair Manual.
If the indication remains at approx. 140° C:
Checking wiring
Add as a workstep to the procedure where required.
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

114 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a Multimeter , check the Intake Air Temperature (IAT)

Sensor -G42 - electrical harness connector terminals to the
Motronic Engine Control Module (ECM) -J220- electrical har‐
ness connector terminals for an open circuit according to the
wiring diagram.
Intake Air Temperature Motronic Engine Control Module
(IAT) Sensor -G42 - (ECM) -J220- electrical connector
electrical harness test box socket
connector terminals
1 85
2 108
Specified value: 1.5 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– If necessary, repair the faulty wiring connection.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
If no malfunction is detected in the wiring:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.7 Engine Speed Sensor, Checking

Note Copying for private or commercial purposes, in part or in whole, is not

Protected by copyright.
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Use only gold-plated terminals when servicing terminals in the
electrical harness connector of the Engine Speed (RPM) Sensor
-G28- .

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.

2. Components, Checking 115

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Function
The Engine Speed (RPM) Sensor -G28- detects RPM and refer‐
ence marks. Without an engine speed signal, the engine will not
start. If the engine speed signal fails while the engine is running,
the engine will stop immediately.
Function test
– Connect the scan tool.
– Switch the ignition on.
– Using the scan tool, check the engine speed:
Diagnostic text Specified value
Engine rotations per minute (RPM) Idle speed
– End diagnosis and switch ignition off.
If the specified value was not obtained:
Checking internal resistance

– Disconnect the gray Engine Speed (RPM) Sensor -G28- elec‐

trical harness connector -3-.
– Using a multimeter , check the Engine Speed (RPM) Sensor -
G28- terminals 2 to 3 for resistance.
Specified value: 730 to 1000 Ω (at approx. 20° C)

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

116 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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– Check Engine Speed (RPM) Sensor -G28- terminals 1 to 2 and

1 to 3 for short circuits.
Specified value: ∞ (infinity)
If any of the specified values are not obtained:
– Replace the Engine Speed (RPM) Sensor -G28- Refer to Fuel
Injection and Ignition Repair Manual.
If the specified values are obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
If the manufacturers test boxpermitted
iswith
not being used. Perform the fol‐
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

lowing step.
respect to the correctness of information in this document. Copyright by AUDI AG.

– Remove the Motronic Engine Control Module (ECM) -J220- .

Refer to ⇒ page 130 .

2. Components, Checking 117

 A4 2002 ➤
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– Using a Multimeter , check the Engine Speed (RPM) Sensor -

G28- electrical harness connector terminals to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector terminals for an open circuit.
Engine Speed (RPM) Sensor - Motronic Engine Control
G28- Module (ECM) -J220- elec‐
electrical harness trical connector test box
connector terminals socket
1 108
2 90
3 82
Specified value: 1.5 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
– Remove the Engine Speed (RPM) Sensor -G28- and check
the sensor wheel for proper seating, damage and run-out Re‐
fer to Fuel Injection and Ignition Repair Manual.
If the sensor wheel is OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2.8 Fuel Injectors, Checking

The following test procedure is used to diagnose all fuel injectors.
Special tools and workshop equipment required
♦ Multimeter .
♦ Diode test lamp (12V) .
♦ Wiring diagram.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

118 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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Test requirements
• The Fuel Injectors -N30, N31, N32, N33- fuses OK.
• The Engine Speed (RPM) Sensor -G28- OK, checking
⇒ page 115 .
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
– Observe safety precautions.
– Observe rules for cleanliness.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
– Disconnect the Fuel Injector electrical harness connectors
from Fuel Injectors -N30, N31, N32, N33- .
Checking internal resistance

– Using a multimeter , check each of the Fuel Injector electrical

terminals 1 to 2 for resistance.
Specified value: 12.0 to 20.0 Ω (at approx. 20° C)
If the specified value was not obtained:
– Replace the malfunctioning Fuel Injector Refer to Fuel Injec‐
tion and Ignition Repair Manual.
If the specified value was obtained:
Checking activation and wiring

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Components, Checking 119

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Connect a diode test lamp (12V) to the electrical harness con‐

nector terminals 1 and 2 of the Fuel Injector to be tested.
– Operate the starter and test the activation of the Fuel Injector .
LED should flicker.
– Switch the ignition off.
If LED does not flicker:
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

120 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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– Using a Multimeter , check the Fuel Injector electrical harness

connector terminals to the Motronic Engine Control Module
(ECM) -J220- electrical harness connector terminals for an
open circuit.
Component Fuel Injec‐ Motronic Engine
tor Control Module
electrical (ECM) -J220-
harness electrical con‐
connector nector test box
terminals sockets
Cylinder 1 Fuel Injector -N30- 1 Pin 2 of J17
(Fuel Pump Re‐
lay
2 96
Cylinder 2 Fuel Injector -N31- 1 Pin 2 of J17
(Fuel Pump Re‐
lay
2 89
Cylinder 3 Fuel Injector -N32- 1 Pin 2 of J17
(Fuel Pump Re‐
lay
2 97
Cylinder 4 Fuel Injector -N33- 1 Pin 2 of J17
(Fuel Pump Re‐
lay
2 88
Specified value: 1.5 Ω Max.
If the specification is not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

2. Components, Checking 121

 A4 2002 ➤
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3 Functions, Checking
⇒ “3.1 Heated Oxygen Sensor and Sensor Regulation before
Catalytic Converter, Checking”, page 122
⇒ “3.2 Oxygen Sensor and Sensor Regulation after Catalytic
Converter, Checking ”, page 124

3.1 Heated Oxygen Sensor and Sensor

Regulation before Catalytic Converter,
Checking

Note

Use only gold-plated terminals when servicing terminals in the

electrical harness connectors of the Heated Oxygen Sensor
(HO2S) -G39-

Special tools and workshop equipment required

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
♦ Multimeter permitted
. unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ Wiring diagram.
Test requirements
• The Heated Oxygen Sensor (HO2S) -G39- fuse OK.
• The Heated Oxygen Sensor (HO2S) -G39- before catalytic
converter OK. Refer to.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Exhaust system between catalytic converter and cylinder head
properly sealed.
• Coolant Temperature at least 80° C.
Function test
– Connect scan tool.
– Start the engine and let it run at idle.
– Select “Diagnostic mode 6: Check test results of components
that are not continuously monitored”.
– Select “Test-ID 01: Oxygen sensor monitoring before catalytic
converter”.
– Select “Test-ID 131: Dynamic test” .
– Check the specified values at idle.

Dynamic test Specified value

min. max.
Normal operation 0.35009 -
Reduced threshold upon suspicion of malfunction in catalytic con‐ 0.39990 -
verter

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If specified values are obtained:

– End diagnosis and switch the ignition off.
If the specified values are not obtained:
Checking primary voltage
– Disconnect the black Heated Oxygen Sensor (HO2S) -G39-
electrical harness connector -5-

– Using a multimeter , check the Heated Oxygen Sensor (HO2S)

electrical harness connector -1- terminals 1 to 5 for voltage.
Specified value: 0.400 to 0.500 Volts
– Switch the ignition off.
If the specified value was not obtained:
– Replace the Heated Oxygen Sensor (HO2S) -G39- Refer to
Fuel Injection and Ignition Repair Manual.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
If the manufacturers test boxwith
is respect
not being used. Perform
to the correctness the
of information fol‐document. Copyright by AUDI AG.
in this
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .

3. Functions, Checking 123

 A4 2002 ➤
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– Using a Multimeter , check the Heated Oxygen Sensor (HO2S)

-G39- electrical harness connector terminals to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector terminals for an open circuit.
Heated Oxygen Sensor Motronic Engine Control Module
(HO2S) -G39- (ECM) -J220- electrical connector
electrical harness terminals or
connector terminals test box sockets
1 70
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
2 71
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
5 51
with respect to the correctness of information in this document. Copyright by AUDI AG.

6 52
Specified value: 1.5 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Final procedures
After repair work, the following work steps must be performed in
the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

3.2 Oxygen Sensor and Sensor Regulation

after Catalytic Converter, Checking
The following procedure is used to diagnose Oxygen Sensor
(O2S) Behind Three Way Catalytic Converter (TWC) -G130-

Note

♦ Vehicle must be raised before the electrical connector of the

Oxygen Sensor (O2S) Behind Three Way Catalytic Converter
(TWC) -G130- is accessible.
♦ When servicing terminals 3 and 4 in the electrical harness
connector of the Oxygen Sensor (O2S) Behind Three Way
Catalytic Converter (TWC) -G130- , use only gold-plated ter‐
minals.

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.

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Test requirements
• The Oxygen Sensor (O2S) Behind Three Way Catalytic Con‐
verter (TWC) -G130- fuse Ok.
• Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Con‐
verter (TWC)) Heater - Z29- OK. Refer to .
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, selector lever in position
“P” or “N”.
• A/C switched off.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
• Ground (GND) connections
permitted unless authorisedbetween
by AUDI AG.engine/transmission/
AUDI AG does not guarantee or accept any liability
chassis OK. with respect to the correctness of information in this document. Copyright by AUDI AG.

• Exhaust system between catalytic converter and cylinder head

properly sealed.
• Coolant Temperature at least 80° C.
Function test
– Connect scan tool.
– Start the engine and let it run at idle.
– Select “Diagnostic mode 6: Check test results of components
that are not continuously monitored”.
– Select “Test-ID 02: Oxygen sensor monitoring behind catalytic
converter”.
– Select following Test-IDs.
– Check the specified values at idle.

Test-ID Specified value

min. max.
1 Rich to lean sensor barrier voltage - 0.6241 V
2 Lean to rich sensor barrier voltage - 0.6241 V
7 Minimum voltage at sensor for test cycle - 0.450 V
8 Maximum voltage at sensor for test cycle 0.450 V -
129 Sensor voltage lean 0 0.6241 V
130 Sensor voltage rich 0.6241 V 1.2998 V
131 Deceleration test 0V 0.1599 V

If the specified values are obtained:

– End diagnosis and switch ignition off.
If the specified values are not obtained:

3. Functions, Checking 125

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Remove the right vehicle floor cover -arrows-.

Checking primary voltage

– Disconnect the brown Oxygen Sensor (O2S) Behind Three

Way Catalytic Converter (TWC) -G130- electrical harness
connector -2-
– Switch the ignition on. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Using a multimeter , check the Oxygen Sensor (O2S) Behind

Three Way Catalytic Converter (TWC) -G130- electrical har‐
ness connector terminals 3 to 4 for voltage.
Specified value: 0.400 to 0.500 Volts
– Switch the ignition off.
If the specified value was obtained:
– Replace the Oxygen Sensor (O2S) Behind Three Way Cata‐
lytic Converter (TWC) - G130- Refer to Fuel Injection and
Ignition Repair Manual.
If the specified value was not obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .

126 Rep. Gr.24 - Multiport Fuel Injection

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– Using a Multimeter , check the Oxygen Sensor (O2S) Behind

Three Way Catalytic Converter (TWC) - G130- electrical har‐
ness connector terminals to the Motronic Engine Control Mod‐
ule (ECM) -J220- electrical harness connector terminals for an
open circuit.
Terminal Motronic Engine Control Module (ECM)
G130 -J220- electrical connector
Test box socket
3 68
4 69
Specified value: 1.5 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– Replace the Motronic Engine Control Module (ECM)
permitted -J220-
unless . by AUDI AG. AUDI AG does not guarantee or accept any liability
authorised
Refer to ⇒ page 130 . with respect to the correctness of information in this document. Copyright by AUDI AG.

– Install the right vehicle floor cover -arrows-.

Final procedures
After repair work, the following work steps must be performed in
the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

3. Functions, Checking 127

 A4 2002 ➤
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4 Engine Control Module

⇒ “4.1 Engine Control Module Power Supply Relay, Checking”,
page 128
⇒ “4.2 Engine Control Module, Replacing”, page 130
Motronic Engine Control Module (ECM) -J220- regulates fuel in‐
jection, Throttle Valve Control Module -J338- , oxygen sensor
regulation, ignition, knock control, Evaporative Emission (EVAP)
Canister Purge Regulator Valve -N80- , engine speed limitation
through fuel injectors or Fuel Pump (FP) Relay -J17- as well as
On Board Diagnostic (OBD).

4.1 Engine Control Module Power Supply

Relay, Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

128 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, selector lever in position
“P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Test sequence
– Remove the Motronic Engine Control Module (ECM) Power
Supply Relay -J271- .
Checking voltage
– Using a Multimeter , check the Motronic Engine Control Mod‐
ule (ECM) Power Supply Relay -J271- socket 2/30 to Ground
(GND).
Specified value: battery voltage.
If the specified value was not obtained:
– Check the wiring connections from the Battery to the Motronic
Engine Control Module (ECM) Power Supply Relay -J271-
socket 2/30 for an open circuit or a short circuit.
– Check the wiring connections for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified value was obtained:
– Switch the ignition on.
– Using a Multimeter , check the Motronic Engine Control Mod‐
ule (ECM) Power Supply Relay -J271- socket 4/86 to Ground
(GND).
Specified value: battery voltage.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Turn key off.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
permitted–unless
Remove
authorisedthe Motronic
AG. AUDIEngine Control
guaranteeModule (ECM) -J220- .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
by AUDI AG does not or accept any liability
with respectRefer to ⇒ page
to the correctness 130 . in this document. Copyright by AUDI AG.
of information

– Using a Multimeter , check the Motronic Engine Control Mod‐

ule (ECM) Power Supply Relay -J271- socket 4/86 to the
Motronic Engine Control Module (ECM) -J220- electrical har‐
ness connector terminal 21 for resistance.

4. Engine Control Module 129

 A4 2002 ➤
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Motronic Engine Control Motronic Engine Control Module

Module (ECM) Power Supply (ECM) -J220- electrical connec‐
Relay -J271- tor test box socket
socket terminal
4/86 21
Specified value: 2.0 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
Checking activation
– Switch the ignition on.
– Using a Multimeter , check the Motronic Engine Control Mod‐
ule (ECM) Power Supply Relay -J271- socket 5/87 to Engine
Ground
Motronic Engine Control Motronic Engine Control Module
Module (ECM) Power Supply (ECM) -J220- electrical connec‐
Relay -J271- tor test box socket
socket terminal
5/87 Engine ground (GND)
Specified value: 12.5 V
– Switch the ignition off.
If the specified value was not obtained:
– Replace the Motronic Engine Control Module (ECM) Power
Supply Relay -J271- : Refer to Fuel Injection and Ignition Re‐
pair Manual.
If no malfunction is found in the wiring and voltage supply was not
OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
3- If the DTC memory was permitted
erased, generate
unless authorisedreadiness code.
by AUDI AG. AUDI AG does not guarantee or accept any liability
Refer to ⇒ page 18 . with respect to the correctness of information in this document. Copyright by AUDI AG.

– End of diagnosis.

4.2 Engine Control Module, Replacing

Removing
Special tools and workshop equipment required
♦ Heat gun .

130 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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Note

When the Motronic Engine Control Module (ECM) -J220- electri‐

cal harness connectors are disconnected, the adaptation values
are erased and the DTC memory content remains intact.

Work procedure
Check the identification of the previous Motronic Engine Control
Module (ECM) -J220- as follows:
– Connect the scan tool.
– Switch the ignition on.
– Using the scan tool, select “Vehicle information”.
– Select “ Calibration Identification” in vehicle information.
The electronic control module identification number will be dis‐
played, e.g.: 06A906032NA 4983
– Record the electronic control module identification number.
– End diagnosis and switch the ignition off.
Procedure
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– with
Switch
respectthe ignition
to the on.
correctness of information in this document. Copyright by AUDI AG.

– Actuate the touch-wipe function to allow the wipers to move to

the end position.

Note

The wiper arms will now move into the line of view on the wind‐
shield (service position).

– Remove the wiper arms caps.

– Loosen the wiper arm nuts -arrows- several turns.
– Loosen the wiper arms from the wiper axle by rocking slightly.
– Remove the wiper arms nuts and the wiper arms from the wip‐
er axles.

– Remove the spray nozzles -arrow-.

– Press the spray nozzles, with the water lines attached, through
the plenum chamber opening.

4. Engine Control Module 131

 A4 2002 ➤
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– Remove the rubber seal -1- and the plenum chamber cover
-2-.

Note

The threads of the shear bolts have been coated with a locking
compound and must be heated to be removed.

The Motronic Engine Control Module (ECM) -J220- is secured via

a protective housing -1- and shear bolts -2-

Caution

To prevent damage (burning) to the wiring and harness con‐

nections, insulation and the electronic control module, perform
the following work steps exactly! Observe operating instruc‐
tions for the heat gun.

WARNING

The heat gun, shear bolts, and parts of the protective housing
will become extremely hot. Use extreme caution when working
with or handling these parts to avoid personal injury.

– Using a Heat gun set at its lowest setting, heat the shear bolt
for approx. 20 to 25 seconds.
– Remove the shear bolt with locking pliers. Discard the used
shear bolts.
Repeat the previous steps for the second shear bolt.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

– Remove the protective housing from the Motronic Engine Con‐

with respect to the correctness of information in this document. Copyright by AUDI AG.

trol Module (ECM) -J220- .

– Remove the front electrical harness connector -1- from the
Motronic Engine Control Module (ECM) -J220- .

132 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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– Remove the Motronic Engine Control Module (ECM) -J220-

from the retainer -arrow-.
– Remove the rear electrical harness connector from the Mo‐
tronic Engine Control Module (ECM) -J220- .
Motronic Engine Control Module (ECM) -J220- installation
Installation is performed in reverse order of removal. Note the fol‐
lowing:
The Motronic Engine Control Module (ECM) -J220- must be in‐
stalled with the protective housing.
Use New shear bolts when installing the Motronic Engine Control
Module (ECM) -J220- .
Motronic Engine Control Module (ECM) -J220- reprogramming
– The new Engine Control Module (ECM) -J623- and immobil‐
izer must be activated.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

4. Engine Control Module 133

 A4 2002 ➤
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5 Additional Signals, Checking

⇒ “5.1 Speed Signal, Checking”, page 134
⇒ “5.2 Can-Bus Terminal Resistance, Checking”, page 135

5.1 Speed Signal, Checking

The following procedure requires a test drive. Observe all safety
precautions.
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
• The Speedometer -G21- OK.
• The Motronic Engine Control Module (ECM) -J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Function test
– Connect the scan tool.
– Perform a road test with a vehicle speed greater than 5 Km/h.
– Using the scan tool, Check the vehicle speed:
Diagnostic text Specified value
Vehicle Speed Approx. Vehicle Speed
– Compare the vehicle speed on the scan tool to the Speedom‐
eter -G21- .
Specified value: a difference of no greater than 10%.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
If the specified value was not obtained or no
permitted speed
unless wasbydisplayed:
authorised AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Check the wiring from the Motronic Engine Control Module
(ECM) -J220- to the Instrument Cluster Control Module -J285-
for an open circuit, Short to Battery (+), or to Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

134 Rep. Gr.24 - Multiport Fuel Injection

 A4 2002 ➤
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5.2 Can-Bus Terminal Resistance, Check‐

ing
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirement
• A CAN-Bus malfunction was recognized.
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Function
The Motronic Engine Control Module (ECM) -J220- communi‐
cates with other CAN-Bus capable control modules.
The control modules are connected by two data bus wires which
are twisted together (CAN_High and CAN_Low), and exchange
information (messages). Missing information on the CAN-bus is
recognized as a malfunction by the Motronic Engine Control Mod‐
ule (ECM) -J220- and the other control modules connected to the
CAN-bus. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
Trouble-free operationwith
ofrespect
the CAN-Bus requires
to the correctness that initthis
of information have a ter‐Copyright by AUDI AG.
document.
minal resistance. This central terminal resistance is located in the
Motronic Engine Control Module (ECM) -J220- .
Procedure
– Disconnect the Instrument Cluster Control Module -J285-
electrical harness connector.

Note

The Motronic Engine Control Module (ECM) -J220- must remain

connected for the following step.

– Using a Multimeter , check the Instrument Cluster Control

Module -J285- electrical harness connector T32a/12 to T32a/
13 for resistance.
Specified value: 60 to 72 Ω (at approx. 20° C)
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:

5. Additional Signals, Checking 135

 A4 2002 ➤
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– Replace the Motronic Engine Control Module (ECM) -J220- .

Refer to ⇒ page 130 .
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Using a Multimeter , check the Instrument Cluster Control
Module -J285- electrical harness connector to the Motronic
Engine Control Module (ECM) -J220- electrical harness con‐
nector for resistance.
Instrument Cluster Control Motronic Engine Control Module
Module -J285- electrical (ECM) -J220- electrical connector
harness connector termi‐ terminals or
nals test box sockets
T32a/12 (Can_Bus Low) 58
T32a/13 (Can_Bus High) 60
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
Specified value: 1.5 Ω Max. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
– Replace the Instrument Cluster Control Module -J285- .
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

136 Rep. Gr.24 - Multiport Fuel Injection

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26 – Exhaust System, Emission Controls

1 Exhaust System
⇒ “1.1 Three Way Catalytic Converter, Checking”, page 137
For all Exhaust System, Emission control component locations.
For all Exhaust System, Emission control removal/installation
procedures and torque specifications.
Check the Technical Bulletins for information that may supersede
any information included in this manual.

Note

♦ All manufacturers special tools as well as common tools may

contain a manufacturer specific part number. These tools may
be substituted with an equivalent aftermarket tool or are avail‐
able for purchase through Audi. Refer to ⇒ Tool catalog .
♦ Manufacturers special tools as well as common tools that con‐
tain a manufacturer specific part number may be referenced
in the test procedure illustrations showing the tool use or in‐
stallation. If the manufacturer specific tool is not being used,
an equivalent aftermarket tool may be installed in the same
manner as the manufacturers special tool.

1.1 Three Way Catalytic Converter, Check‐

ing
Function test
– Connect the scan tool.
– Start the engine and let it run at idle.
– Select “Diagnostic mode 6: Check test results of components
that are not continuously monitored”.
– Select “Catalytic converter monitoring”.
– Select following OBDMID.
– Check the specified values at idle.
OBDMID Specified value
min. max.
132 Oxygen retention capability 1.0 65535

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
– permitted
End diagnosis and switch the ignition off.
unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If the specified values are exceeded:
– Replace the catalytic converter with front exhaust pipe Refer
to Engine Mechanical Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .

1. Exhaust System 137

 A4 2002 ➤
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3- If the DTC memory was erased, generate readiness code.

Refer to ⇒ page 18 .
– End of diagnosis.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

138 Rep. Gr.26 - Exhaust System, Emission Controls

 A4 2002 ➤
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2 Secondary Air Injection System

⇒ “2.1 Secondary Air Injection Solenoid Valve, Checking”,
page 139
⇒ “2.2 Secondary Air Injection Pump Relay, Checking”,
page 141
⇒ “2.3 Secondary Air Injection Pump Motor, Checking”,
page 143
Principle
Due to the rich mixture during the cold start phase, the exhaust
emissions contain an increased level of unburned hydrocarbons.
The Secondary Air Injection (AIR) system improves the secon‐
dary oxidation within the catalytic converter, thereby reducing
harmful emissions. The heat released by secondary oxidation
shortens the startup time of the catalytic converter considerably,
as well as significantly improves emissions quality during the cold-
running phase.
Function
♦ During cold start (with coolant temperatures +15 to +35° C),
the Secondary Air Injection (AIR) system blows air behind the
exhaust valve for approx. 65 seconds. This produces an oxy‐
gen rich exhaust gas, causes the after burning and reduces
the heating-up phase of the catalytic converter.
♦ In addition, the Secondary Air Injection (AIR) system is switch‐
ed on with a delay of approx. 20 seconds during idle for 5
seconds after every engine start up to max. 80° C coolant
temperature and is checked via On Board Diagnostic (OBD).

2.1 Secondary Air Injection Solenoid Valve,

Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
• Fuse -S234- OK.
• The Fuel Pump (FP) Relay -J17- OK.
• Battery voltage at least 12.5 V.
• All electrical consumers switched off (radiator fan must NOT
run during test).
• A/C switched off.
• The ignition switched off.
Procedure

Note

Voltage is supplied to the Secondary Air Injection (AIR) Solenoid

Valve -N112- from the Fuel Pump (FP) Relay -J17- .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

2. Secondary Air Injection System 139

 A4 2002 ➤
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Procedure
– Disconnect the Secondary Air Injection (AIR) Solenoid Valve
-N112- electrical harness connector -2-.
Checking internal resistance

– Using a multimeter , check the Secondary Air Injection (AIR)

Solenoid Valve -N112- terminals 1 to 2 for resistance.
Specified value: 25 to 35 Ω (at approx. 20° C)
If the specified value was not obtained:
– Replace the Secondary Air Injection (AIR) Solenoid Valve -
N112- : Refer to Engine Mechanical Repair Manual.
If the specified value was obtained:
Checking voltage supply
Crank the engine.

– Using a multimeter , check the Secondary Air Injection (AIR)

Solenoid Valve -N112- electrical connector terminal 1 to
Ground (GND) for voltage.
Specified value: battery voltage.
Switch the ignition off.
If the specified value was not obtained:
– Check the wiring from the Secondary Air Injection (AIR) Sol‐
enoid Valve -N112- electrical connector terminal 1 to the Fuel
Pump (FP) Relay -J17- terminal 2 for a short circuit to Battery
positive (+), Ground (GND), or an open circuit.
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking wiring
If the manufacturers test box is being used. Perform the following
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
step. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
– Install the test box. (test box) at Engine Control Module.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

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– Using a multimeter , check the Secondary Air Injection (AIR)

Solenoid Valve -N112- electrical harness connector terminal
2 to the Motronic Engine Control Module (ECM) -J220- elec‐
trical harness connector terminal 9 for an open circuit.
Secondary Air Injection (AIR) Motronic Engine Control Module
Solenoid Valve -N112- (ECM) -J220- electrical connec‐
electrical harness tor terminal or test box socket
connector terminal
2 9
Specified value: 1.5 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– Check the electrical harness connector for damage, corrosion,
with respect to the correctness of information in this document. Copyright by AUDI AG.

lose or broken terminals.

– If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After repair work, the following work steps must be performed in
the following sequence:
1- Check the DTC memory. Refer to ⇒ page 3 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 3 .
– End of diagnosis.

2.2 Secondary Air Injection Pump Relay,

Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
• Fuse -S130- OK.
• Fuse -S234- OK.
• The Fuel Pump (FP) Relay -J17- OK.
• Battery voltage at least 12.5 V.
• All electrical consumers switched off (radiator fan must NOT
run during test).
• A/C switched off.
• The ignition switched off.
Procedure
– Remove the Secondary Air Injection (AIR) Pump Relay --
J299-- .

2. Secondary Air Injection System 141

 A4 2002 ➤
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Checking voltage
– Using a Multimeter , check the Secondary Air Injection (AIR)
Pump Relay --J299-- socket 8/87 to Ground (GND).
Specified value: battery voltage.
If the specified value was not obtained:
– Check the wiring connections from the Battery to the Secon‐
dary Air Injection (AIR) Pump Relay --J299-- socket 8/87 for
an open circuit or a short circuit.
– Check the wiring connections for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified value was obtained:
– Crank the engine.
– Using a Multimeter , check the Secondary Air Injection (AIR)
Pump Relay --J299-- socket 4/86 for voltage.
Specified value: battery voltage.
– Switch the ignition off.
If the specified value was not obtained:
– Check the wiring connection from the Fuel Pump (FP) Relay -
J17- socket 2 to the Secondary Air Injection (AIR) Pump Relay
--J299-- socket 4/86 for an open circuit or a short circuit.
– Check the wiring connections for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability

If the manufacturers test box is not being used. Perform the fol‐
with respect to the correctness of information in this document. Copyright by AUDI AG.

lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Using a Multimeter , check the Secondary Air Injection (AIR)
Pump Relay --J299-- socket 6/T to the Motronic Engine Con‐
trol Module (ECM) -J220- electrical harness connector termi‐
nal 66 for resistance.
Secondary Air Injection (AIR) Motronic Engine Control Module
Pump Relay --J299-- (ECM) -J220- electrical connec‐
socket terminal tor
terminal or
test box socket
6/T 66
Specified value: 1.5 Ω Max.
If the specification was not obtained:
– Check the wiring for a short circuit to each other, Battery (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.

142 Rep. Gr.26 - Exhaust System, Emission Controls

 A4 2002 ➤
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– If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was
OK:
– Replace the Secondary Air Injection (AIR) Pump Relay --
J299-- . Refer to Engine Mechanical Repair Manual.
If no malfunction is found in the wiring and voltage supply was not
OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
Final procedures
After repair work, the following work steps must be performed in
the following sequence:
1- Check the DTC memory. Refer to ⇒ page 3 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 3 .
– End of diagnosis.

2.3 Secondary Air Injection Pump Motor,

Checking
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.
Test requirements
• Fuse -S130- OK.
• The Fuel Pump (FP) Relay -J17- OK.
• Battery voltage at least 12.5Protected
V. by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
• All electrical consumers switched off (radiator
with respect fan of
to the correctness must NOTin this document. Copyright by AUDI AG.
information
run during test).
• A/C switched off.
• The ignition switched off.
Procedure
– Remove the center noise insulation fasteners -arrows- and
noise insulator.

2. Secondary Air Injection System 143

 A4 2002 ➤
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– Disconnect the Secondary Air Injection (AIR) Pump Motor --

V101-- electrical harness connector.
Checking voltage
– Crank the engine.

– Using a Multimeter , check the Secondary Air Injection (AIR)

Pump Motor --V101-- electrical harness connector terminal 2
to Ground (GND).
Specified value: battery voltage.
– Switch the ignition off.
If the specified value was not obtained:
– Check the wiring connection from the Secondary Air Injection
(AIR) Pump Relay --J299-- socket 2/30 to the Secondary Air
Injection (AIR) Pump Motor --V101-- electrical harness con‐
nector terminal 2 for an open circuit or a short circuit.
– Check the wiring connections for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking Ground (GND)

– Using a Multimeter , check the Secondary Air Injection (AIR)

Pump Motor --V101-- electrical harness connector terminal 1
to Ground (GND) for resistance.
Specified value: 1.5 Ω Max.
IfProtected
the specification wasfornot
by copyright. Copying obtained:
private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
– with
Check
respectthe
to thewiring forofainformation
correctness short circuit to each
in this document. other,by Battery
Copyright AUDI AG. (+),
and Ground (GND).
– Check the electrical harness connector for damage, corrosion,
lose or broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and voltage supply was
OK:
– Replace Secondary Air Injection (AIR) Pump Motor --V101--
Refer to Engine Mechanical Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 3 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 3 .
– End of diagnosis.

144 Rep. Gr.26 - Exhaust System, Emission Controls

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28 – Ignition/Glow Plug System

1 Ignition System, Servicing
⇒ “1.1 Safety Precautions”, page 146
⇒ “1.2 Test Data, Spark Plugs”, page 146
⇒ “1.3 Camshaft Position Sensor, Checking”, page 147
⇒ “1.4 Camshaft Adjustment Valve 1, Checking”, page 149
⇒ “1.5 Knock Sensors, Checking”, page 152
⇒ “1.6 Ignition Coils with Power Output Stage, Checking”,
page 155
For all Ignition/Glow plug system component locations. Refer to
Fuel Injection and Ignition Repair Manual.
For all Ignition/Glow plug system removal/installation procedures
and torque specifications. Refer to Fuel Injection and Ignition Re‐
pair Manual.
Check the Technical Bulletins for information that may supersede
any information included in this manual.

Note
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ All manufacturers special tools as well as common tools may
contain a manufacturer specific part number. These tools may
be substituted with an equivalent aftermarket tool or are avail‐
able for purchase through Audi. Refer to ⇒ Tool catalog .
♦ Manufacturers special tools as well as common tools that con‐
tain a manufacturer specific part number may be referenced
in the test procedure illustrations showing the tool use or in‐
stallation. If the manufacturer specific tool is not being used,
an equivalent aftermarket tool may be installed in the same
manner as the manufacturers special tool.
♦ The manufacturers test box Test Box 105 Pin -VAG1598/31-
is available for purchase or rental. Refer to the ⇒ Tool catalog .

1. Ignition System, Servicing 145

 A4 2002 ➤
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1.1 Safety Precautions

WARNING

Observe the following for all installations, especially in the en‐

gine compartment due to lack of room:
♦ Route lines of all types (e.g. for fuel, hydraulic, EVAP can‐
ister system, coolant and refrigerant, brake fluid, vacuum)
and electrical wiring so that the original path is followed.
♦ Watch for sufficient clearance to all moving or hot compo‐
nents.
♦ Fuel system is under pressure! Before opening system,
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

place rags around the connection point. Then with

release
respectpres‐
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
to the correctness of information in this document. Copyright by AUDI AG.
sure by carefully loosening connection.
♦ Test equipment must always be secured to the rear seat
and operated by a second person.
♦ Test and measuring equipment that is operated from the
passenger seat, the person seated could be injured in the
event of an accident involving deployment of the passen‐
ger-side airbag.
♦ Do not touch or disconnect ignition wires when engine is
running or turning at starting RPM.
♦ Only disconnect and reconnect wires for injection and igni‐
tion system, including test leads, if the ignition is turned off.

WARNING

The use of nails, paper clips, or another unauthorized materials

to back-probe electrical harness connectors is strictly prohibi‐
ted and may cause damage to the electrical harness connec‐
tors, terminal ends or damage to a component. Use only the
manufacturers test lead kit or an equivalent aftermarket test
lead kit for back-probing all electrical harness connectors.

If engine is to be cranked at starting RPM without starting, e.g. for

a compression test:
– Remove Fuse 6 (on fuse panel B) SB6 and Fuse 29 (on fuse
panel B) SB29 from the fuse holder, E-box, plenum chamber.
By removing Fuse 6 (on fuse panel B) SB6, voltage supply of
Ignition Coils with Power Output Stage -N70, N127, N291, N292-
is interrupted, that of Fuel Injectors -N30, N31, N32, N33- by
removing Fuse 29 (on fuse panel B) SB29.

1.2 Test Data, Spark Plugs

Engine code AMB (1.8L / 125 kW Turbo-FSI engine)
Engine Control Module Motronic ME 7
(ECM) System identification
Engine idle speed 700-860 rpm

146 Rep. Gr.28 - Ignition/Glow Plug System

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Engine code AMB (1.8L / 125 kW Turbo-FSI engine)

Engine speed (RPM) limita‐ approx. 6800 RPM
tion
Ignition sequence 1-3-4-2
Ignition timing Not adjustable, regulated by Electronic control module
Ignition system Single coil ignition system with 4 ignition coils (output stages integrated) that
are connected directly to spark plugs via the ignition cables.
Spark plugs 101 905 600
Manufacturer code PZFR5J-11
Spark plug gap 1.0 to 1.1 mm
Tightening torque 25 Nm

1.3 Camshaft Position Sensor, Checking

Note

Use only gold-plated terminals when servicing terminals in har‐

ness connector of Camshaft Position (CMP) Sensor -G40- .

Special tools and workshop equipment required

♦ Multimeter .
♦ Wiring diagram.
Test requirements
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections betweenProtected
engine/transmission/
by copyright. Copying for private or commercial purposes, in part or in whole, is not
chassis OK. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.

1. Ignition System, Servicing 147

 A4 2002 ➤
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– Disconnect the Camshaft Position (CMP) Sensor -G40- elec‐

trical harness connector -1-.
– Switch the ignition on.

– Using a Multimeter , Check the Camshaft Position (CMP) Sen‐

sor -G40- electrical harness connector terminals 1 to 3 for
voltage.
Specified value: about 5.0 V
– Switch the ignition off.
If the specification was not obtained:
Checking wiring Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

If the manufacturers test box is being used. Perform

with the following
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
respect to the correctness of information in this document. Copyright by AUDI AG.
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

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 A4 2002 ➤
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– Using a Multimeter , Check the Camshaft Position (CMP) Sen‐

sor -G40- electrical harness connector to the Motronic Engine
Control Module (ECM) electrical harness connector for an
open circuit.
Camshaft Position (CMP) Motronic Engine Control Module
Sensor -G40- electrical (ECM) electrical harness test box
harness sockets
connector terminals
1 98
2 86
3 108
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for by
damage, corrosion, lose or or accept any liability
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised AUDI AG. AUDI AG does not guarantee
broken terminals.
with respect to the correctness of information in this document. Copyright by AUDI AG.

– If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was
OK:
– Replace the Camshaft Position (CMP) Sensor -G40- Refer to
Fuel Injection and Ignition Repair Manual.
If no malfunction is found in the wiring and voltage supply was not
OK:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory ⇒ page 6 .
2- If necessary, erase the DTC memory ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code
⇒ page 18 .
– End of diagnosis.

1.4 Camshaft Adjustment Valve 1, Check‐

ing
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.

1. Ignition System, Servicing 149

 A4 2002 ➤
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Test requirements
• The Camshaft Adjustment Valve 1 -N205- fuse OK.
• Motronic Engine Control Module (ECM) Power Supply Relay
-J271- OK, checking ⇒ Wiring diagrams, Troubleshooting &
Component locations.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Disconnect Camshaft Adjustment Valve 1 -N205- electrical

harness connector -1-.

150 Rep. Gr.28 - Ignition/Glow Plug System

 A4 2002 ➤
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– Using a Multimeter , check the Camshaft Adjustment Valve 1

-N205- pins 1 to 2, for resistance.
Specified value: 5.0 to 8.0 Ω (at approx. 20° C)
If the specified value was not obtained:
– Replace the Camshaft Adjustment Valve 1 -N205- .
If the specified value was obtained:
Checking voltage
– Switch the ignition on.
– Using a Multimeter , Check the Camshaft Adjustment Valve 1
-N205- electrical harness connector terminal pin 1 ground.
– Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
If the manufacturers
with respecttest
to thebox is notof being
correctness used.
information PerformCopyright
in this document. the fol‐
by AUDI AG.
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

1. Ignition System, Servicing 151

 A4 2002 ➤
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– Using a Multimeter , Check the Camshaft Adjustment Valve 1

-N205- electrical harness connector terminal 2 to the Motronic
Engine Control Module (ECM) electrical harness connector
terminal 115 for an open circuit.
Camshaft Adjustment Valve Motronic Engine Control Module
1 -N205- electrical harness (ECM) electrical harness test box
connector terminal socket
2 115
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and voltage supply was not
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not

OK:
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Replace the Motronic Engine Control Module (ECM) -J220- .

Refer to ⇒ page 130 .
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

1.5 Knock Sensors, Checking

The following procedure is used to diagnose all Knock Sensors .
Special tools and workshop equipment required
♦ Multimeter .
♦ Wiring diagram.

152 Rep. Gr.28 - Ignition/Glow Plug System

 A4 2002 ➤
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Test requirements
• The mounting bolt of Knock Sensor (KS) 1 -G61- / Knock Sen‐
sor (KS) 2 -G66- tightened to 20 Nm.
• The Motronic Engine Control Module (ECM) - J220- fuses OK.
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.

Note

Before disconnecting the Knock Sensor electrical harness con‐

nectors, mark the component location.

– Disconnect the green Knock Sensor (KS) 1 -G61- electrical

harness connector-1- or the gray Knock Sensor (KS) 2 -G66-
electrical harness connector -2-.
Checking internal resistance

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Ignition System, Servicing 153

 A4 2002 ➤
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– Using a Multimeter , check the Knock Sensor terminals 1 to 2

for an internal short.
Specified value: ∞ (Infinity).
If the specified value was not obtained:
– Replace the faulty Knock Sensor (KS) 1 -G61- / Knock Sensor
(KS) 2 -G66- Refer to Fuel Injection and Ignition Repair Man‐
ual.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer to Fuel Injection and Ignition Repair
Manual.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

154 Rep. Gr.28 - Ignition/Glow Plug System

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a Multimeter , Check the Knock Sensor electrical har‐

ness connector to the Motronic Engine Control Module (ECM)
-J220- electrical harness connector for an open circuit.
Knock Sensor (KS) 1 -G61- Motronic Engine Control Module
electrical harness (ECM) electrical harness test box
connector terminals sockets
1 106
2 99
3 108

Knock Sensor (KS) 2 -G66- Motronic Engine Control Module

electrical harness (ECM) electrical harness test box
connector terminals sockets
1 107
2 99
3 108
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and the resistance was not
OK:
– Replace the faulty Knock Sensor (KS) 1 -G61- / Knock Sensor
(KS) 2 -G66- Refer to Fuel Injection and Ignition Repair Man‐
ual. Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
If no malfunction is found in the wiring andto the
with respect resistance
the correctness was OK:
of information in this document. Copyright by AUDI AG.

– Replace the Motronic Engine Control Module (ECM) -J220- .

Refer to ⇒ page 130 .
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

1.6 Ignition Coils with Power Output Stage,

Checking
The following procedure is used to diagnose all Ignition Coils with
Power Output Stage .
Special tools and workshop equipment required
♦ Multimeter .
♦ Diode test lamp .

1. Ignition System, Servicing 155

 A4 2002 ➤
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♦ Wiring diagram.
Test requirements
• The Ignition Coils with Power Output Stage - N70, N127,
N291, N292- fuses OK.
• The Motronic Engine Control Module (ECM) Power Supply
Relay -J271- OK, ⇒ page 128
• The Engine Speed (RPM) Sensor -G28- OK, ⇒ page 115 .
• The Camshaft Position (CMP) Sensor -G40- OK,
⇒ page 147 .
• Battery voltage at least 12.5 volts.
• All electrical consumers such as, lights and rear window de‐
froster, switched off.
• Vehicles with automatic transmission, shift selector lever into
position “P” or “N”.
• A/C switched off.
• Ground (GND) connections between engine/transmission/
chassis OK.
• Ignition switched off.
Procedure

– Remove the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.

– Remove the Ignition Coils with Power Output Stage -N70,

N127, N291, N292- electrical harness screws -1-.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

156 Rep. Gr.28 - Ignition/Glow Plug System

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Disconnect the Ignition Coils with Power Output Stage -N70,

N127, N291, N292- electrical harness connectors -arrows-
from the Ignition Coils with Power Output Stage -N70, N127,
N291, N292- .
Checking voltage supply
– Switch the ignition on.

– Using a Multimeter , check the Ignition Coil electrical harness

connector terminals 1 to 4 for voltage.
Specified value: battery voltage.
– Switch the ignition off.
If the specified value was not obtained:
– Check the Ignition Coil electrical harness connector terminal
1 to the Motronic Engine Control Module (ECM) Power Supply
Relay -J271 - terminal 8/87 for an open circuit.
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified values were obtained:
Checking activation

WARNING

Do not touch the Ignition Coils connecting parts or adapter ca‐

bles during the following test.

– Disable the power supply to the Fuel Injectors -N30, N31, N32,
N33- by removing Fuse 29 (on fuse panel B) from the fuse
holder SB29, in the E-box, plenum chamber.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Ignition System, Servicing 157

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

– Using a diode test lamp , check the Ignition Coil electrical har‐
ness connector terminals 2 to 3 for voltage.
– Operate the starter.
The LED should flicker.
– Switch the ignition off.
If the LED flickers and the voltage was OK:
– Replace the faulty Ignition Coils with Power Output Stage -
N70, N127, N291, N292- Refer to Fuel Injection and Ignition
Repair Manual.
If the LED does not flicker:
Checking wiring
If the manufacturers test box is being used. Perform the following
step.
– Install the test box. Refer toProtected
Fuel Injection and Ignition Repair
by copyright. Copying for private or commercial purposes, in part or in whole, is not
Manual. permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
If the manufacturers test box is not being used. Perform the fol‐
lowing step.
– Remove the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

– Using a Multimeter , Check the Ignition Coil electrical harness

connector to the Motronic Engine Control Module (ECM) -
J220- electrical harness connector for an open circuit.
Ignition Coils with Power Motronic Engine Control Module
Output Stage - (ECM) electrical
N70,N127,N291,292- or test box socket
electrical
harness connector
terminal
3 102
3 95
3 103
3 94
Specified value: 1.5 Ω Max.
If the specified value was not obtained:
– Check the wiring connection for an open circuit, short circuit
to Battery (+) or Ground (GND).
– Check the wiring connection for damage, corrosion, lose or
broken terminals.
– If necessary, repair the faulty wiring connection.
If the specified values were obtained:
– Replace the Motronic Engine Control Module (ECM) -J220- .
Refer to ⇒ page 130 .

158 Rep. Gr.28 - Ignition/Glow Plug System

 A4 2002 ➤
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– Connect the Ignition Coils with Power Output Stage -N70,

N127, N291, N292- electrical harness connectors -arrows- to
the Ignition Coils with Power Output Stage -N70, N127, N291,
N292- .

– Install the Ignition Coils with Power Output Stage -N70, N127,
N291, N292- electrical harness screws -1-.
– Install the engine cover with air filter Refer to Fuel Injection
and Ignition Repair Manual.
Final procedures
After the repair work, the following work steps must be performed
in the following sequence:
1- Check the DTC memory. Refer to ⇒ page 6 .
2- If necessary, erase the DTC memory. Refer to ⇒ page 8 .
3- If the DTC memory was erased, generate readiness code.
Refer to ⇒ page 18 .
– End of diagnosis.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

1. Ignition System, Servicing 159

 A4 2002 ➤
Generic Scan Tool - Edition 09.2006

38 – Automatic Transmission-Gears, Hydraulic Controls

1 Continuously Variable Transmission,
Checking
For electrical diagnosis of the Continuously Variable Transmis‐
sion (CVT) 01J, Refer to Transmission Repair Manual.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

160 Rep. Gr.38 - Automatic Transmission-Gears, Hydraulic Controls

 Cautions & Warnings

Please read these WARNINGS and CAUTIONS before proceeding with maintenance
and repair work. You must answer that you have read and you understand these
WARNINGS and CAUTIONS before you will be allowed to view this information.

•= If you lack the skills, tools and equipment, or a suitable workshop for any procedure described in
this manual, we suggest you leave such repairs to an authorized Audi retailer or other qualified
shop. We especially urge you to consult an authorized Audi retailer before beginning repairs on
any vehicle that may still be covered wholly or in part by any of the extensive warranties issued by
Audi.

•= Disconnect the battery negative terminal (ground strap)whenever you work on the fuel system or
the electrical system. Do not smoke or work near heaters or other fire hazards. Keep an approved
fire extinguisher handy.

•= Audi is constantly improving its vehicles and sometimes these changes, both in parts and
specifications, are made applicable to earlier models. Therefore, part numbers listed in this
manual are for reference only. Always check with your authorized Audi retailer parts department
for the latest information.

•= Any time the battery has been disconnected on an automatic transmission vehicle, it will be
necessary to reestablish Transmission Control Module (TCM) basic settings using the VAG 1551
Scan Tool (ST).

•= Never work under a lifted vehicle unless it is solidly supported on stands designed for the purpose.
Do not support a vehicle on cinder blocks, hollow tiles or other props that may crumble under
continuous load. Never work under a vehicle that is supported solely by a jack. Never work under
the vehicle while the engine is running.

•= For vehicles equipped with an anti-theft radio, be sure of the correct radio activation code before
disconnecting the battery or removing the radio. If the wrong code is entered when the power is
restored, the radio may lock up and become inoperable, even if the correct code is used in a later
attempt.

•= If you are going to work under a vehicle on the ground, make sure that the ground is level. Block
the wheels to keep the vehicle from rolling. Disconnect the battery negative terminal (ground
strap) to prevent others from starting the vehicle while you are under it.

•= Do not attempt to work on your vehicle if you do not feel well. You increase the danger of injury to
yourself and others if you are tired, upset or have taken medicine or any other substances that
may impair you or keep you from being fully alert.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
•= Never run the engine unless thepermitted
work areaunlessis well ventilated.
authorised Carbon
by AUDI AG. AUDI monoxide
AG does not guarantee(CO) kills.
or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

•= Always observe good workshop practices. Wear goggles when you operate machine tools or work
with acid. Wear goggles, gloves and other protective clothing whenever the job requires working
with harmful substances.

•= Tie long hair behind your head. Do not wear a necktie, a scarf, loose clothing, or a necklace when
you work near machine tools or running engines. If your hair, clothing, or jewelry were to get
caught in the machinery, severe injury could result.

=Page 1 of 3
© 2002 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual
property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be
reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be
modified or reposted to other sites, without the prior expressed written permission of the publisher.
Version 1.0
 Cautions & Warnings
•= Do not re-use any fasteners that are worn or deformed in normal use. Some fasteners are
designed to be used only once and are unreliable and may fail if used a second time. This
includes, but is not limited to, nuts, bolts, washers, circlips and cotter pins. Always follow the
recommendations in this manual - replace these fasteners with new parts where indicated, and
any other time it is deemed necessary by inspection.

•= Illuminate the work area adequately but safely. Use a portable safety light for working inside or
under the vehicle. Make sure the bulb is enclosed by a wire cage. The hot filament of an
accidentally broken bulb can ignite spilled fuel or oil.

•= Friction materials such as brake pads and clutch discs may contain asbestos fibers. Do not create
dust by grinding, sanding, or by cleaning with compressed air. Avoid breathing asbestos fibers and
asbestos dust. Breathing asbestos can cause serious diseases such as asbestosis or cancer, and
may result in death.

•= Finger rings should be removed so that they cannot cause electrical shorts, get caught in running
machinery, or be crushed by heavy parts.

•= Before starting a job, make certain that you have all the necessary tools and parts on hand. Read
all the instructions thoroughly, do not attempt shortcuts. Use tools that are appropriate to the work
and use only replacement parts meeting Audi specifications. Makeshift tools, parts and
procedures will not make good repairs.

•= Catch draining fuel, oil or brake fluid in suitable containers. Do not use empty food or beverage
containers that might mislead someone into drinking from them. Store flammable fluids away from
fire hazards. Wipe up spills at once, but do not store the oily rags, which can ignite and burn
spontaneously.

•= Use pneumatic and electric tools only to loosen threaded parts and fasteners. Never use these
tools to tighten fasteners, especially on light alloy parts. Always use a torque wrench to tighten
fasteners to the tightening torque listed.

•= Keep sparks, lighted matches, and open flame away from the top of the battery. If escaping
hydrogen gas is ignited, it will ignite gas trapped in the cells and cause the battery to explode.

•= Be mindful of the environment and ecology. Before you drain the crankcase, find out the proper
way to dispose of the oil. Do not pour oil onto the ground, down a drain, or into a stream, pond, or
lake. Consult local ordinances that govern the disposal of wastes.

•= The air-conditioning (A/C) system is filled with a chemical refrigerant that is hazardous. The A/C
system should be serviced only by trained automotive service technicians using approved
refrigerant recovery/recycling equipment, trained in related safety precautions, and familiar with
regulations governing the discharging and disposal of automotive chemical refrigerants.

•= Before doing any electrical welding on vehicles equipped with anti-lock brakes (ABS), disconnect
the battery negative terminal (ground strap) and the ABS control module connector.

•= Do not expose any part of the A/C system to high temperatures such as open flame. Excessive
heat will increase system pressure and may cause the system to burst.

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
=Page 2 of 3
with respect to the correctness of information in this document. Copyright by AUDI AG.
© 2002 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual
property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be
reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be
modified or reposted to other sites, without the prior expressed written permission of the publisher.
Version 1.0
 Cautions & Warnings
•= When boost-charging the battery, first remove the fuses for the Engine Control Module (ECM), the
Transmission Control Module (TCM), the ABS control module, and the trip computer. In cases
where one or more of these components is not separately fused, disconnect the control module
connector(s).

•= Some of the vehicles covered by this manual are equipped with a supplemental restraint system
(SRS), that automatically deploys an airbag in the event of a frontal impact. The airbag is operated
by an explosive device. Handled improperly or without adequate safeguards, it can be accidentally
activated and cause serious personal injury. To guard against personal injury or airbag system
failure, only trained Audi Service technicians should test, disassemble or service the airbag
system.

•= Do not quick-charge the battery (for boost starting) for longer than one minute, and do not exceed
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
16.5 volts
permitted at the battery
unless authorised with
by AUDI AG. theAGboosting
AUDI cables attached. Wait
at least one minute before
does not guarantee or accept any liability
boosting the
with respect to the battery
correctnessaofsecond
informationtime.
in this document. Copyright by AUDI AG.

•= Never use a test light to conduct electrical tests of the airbag system. The system must only be
tested by trained Audi Service technicians using the VAG 1551 Scan Tool (ST) or an approved
equivalent. The airbag unit must never be electrically tested while it is not installed in the vehicle.

•= Some aerosol tire inflators are highly flammable. Be extremely cautious when repairing a tire that
may have been inflated using an aerosol tire inflator. Keep sparks, open flame or other sources of
ignition away from the tire repair area. Inflate and deflate the tire at least four times before
breaking the bead from the rim. Completely remove the tire from the rim before attempting any
repair.

•= When driving or riding in an airbag-equipped vehicle, never hold test equipment in your hands or
lap while the vehicle is in motion. Objects between you and the airbag can increase the risk of
injury in an accident.

I have read and I understand these Cautions and Warnings.

=Page 3 of 3
© 2002 Audi of America, Inc.
All rights reserved. Information contained in this document is based on the latest information available at the time of printing and is subject to the copyright and other intellectual
property rights of Audi of America, Inc., its affiliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be
reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be
modified or reposted to other sites, without the prior expressed written permission of the publisher.
Version 1.0