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Service Manual
Trucks
Group28
MID 128 Fault Code Guide
2007 Emissions
VN, VHD VERSION2, VT

PV776-20184635
 Foreword
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The descriptions and service procedures contained in this manual are based on designs
and methods studies carried out up to October 2008.

The products are under continuous development. Vehicles and components produced
after the above date may therefore have different specifications and repair methods.
When this is believed to have a significant bearing on this manual, supplementary
service bulletins will be issued to cover the changes.

The new edition of this manual will update the changes.

In service procedures where the title incorporates an operation number, this is a

reference to an V.S.T. (Volvo Standard Times).

Service procedures which do not include an operation number in the title are for general
information and no reference is made to an V.S.T.

Each section of this manual contains specific safety information and warnings which
must be reviewed before performing any procedure. If a printed copy of a procedure is
made, be sure to also make a printed copy of the safety information and warnings that
relate to that procedure. The following levels of observations, cautions and warnings
are used in this Service Documentation:

Note: Indicates a procedure, practice, or condition that must be followed in order to have
the vehicle or component function in the manner intended.

Caution: Indicates an unsafe practice where damage to the product could occur.

Warning: Indicates an unsafe practice where personal injury or severe damage to the
product could occur.

Danger: Indicates an unsafe practice where serious personal injury or death could occur.

Volvo Truck North America a division of Volvo Group North

America, Inc.
Greensboro, NC USA

Order number: PV776-20184635

Repl: This Service Manual replaces Manual 28 "Fault Code Guide 2007 Emissions" (7.2007) Publication no.
PV776–20113992.

© 2008 Volvo Truck North America a division of Volvo Group North America, Inc., Greensboro, NC USA

All rights reserved. No part of this publication may be reproduced, stored in

retrieval system, or transmitted in any forms by any means, electronic,
mechanical, photocopying, recording or otherwise, without the prior written
permission of Volvo Truck North America a division of Volvo Group North
America, Inc.
USA32772.ihval
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Contents
GROUP 28 ............................................................................................ 3

Design and Function ........................................................................... 3

Engine Control System ........................................................................ 3

Troubleshooting ...................................................................................
Engine ECU, Fault Tracing ...................................................................
MID 128 PID 26 Fan Speed Percent ....................................................
MID 128 PID 45 Preheater Relay ........................................................
11
11
14
14
MID 128 PID 81 Particulate Filter ........................................................ 15
MID 128 PID 84 Vehicle Speed ........................................................... 15
MID 128 PID 85 Cruise Control Status ................................................ 15
MID 128 PID 91 Accelerator Pedal Position ........................................ 16
MID 128 PID 94 Fuel Delivery Pressure .............................................. 16
MID 128 PID 97 Water in Fuel Indicator .............................................. 17
MID 128 PID 98 Engine Oil Level ........................................................ 17
MID 128 PID 100 Engine Oil Pressure ................................................ 18
MID 128 PID 102 Intake Manifold Pressure ......................................... 19
MID 128 PID 103 Turbo Speed ............................................................ 20
MID 128 PID 105 Intake Manifold Temperature ................................... 21
MID 128 PID 108 Atmospheric Pressure ............................................. 22
MID 128 PID 110 Coolant Temperature ............................................... 23
MID 128 PID 111 Coolant Level .......................................................... 24
MID 128 PID 153 Crankcase Pressure ................................................ 25
MID 128 PID 171 Ambient Temperature .............................................. 26
MID 128 PID 173 Exhaust Temperature .............................................. 26
MID 128 PID 175 Engine Oil Temperature .......................................... 27
MID 128 PID 354 Relative Humidity .................................................... 28
MID 128 PID 411 EGR Exhaust Back Pressure .................................. 29
MID 128 PID 412 EGR Temperature ................................................... 30
MID 128 PPID 35 EGR Mass Flow ...................................................... 31
MID 128 PPID 89 Variable Geometry Turbocharger Smart Remote
Actuator Temperature .......................................................................... 31
MID 128 PPID 122 Engine Compression Brake .................................. 32
MID 128 PPID 270 NOx Sensor .......................................................... 33
MID 128 PPID 272 Air Pressure Compensation .................................. 34
MID 128 PPID 326 Soot Level ............................................................. 34
MID 128 PPID 328 Aftertreatment Injection Shutoff Valve .................. 35
MID 128 PPID 329 Aftertreatment Fuel Injector .................................. 35
MID 128 PPID 330 DRV ...................................................................... 36
MID 128 PPID 337 Ash Level .............................................................. 37
MID 128 PPID 387 Temperature Sensor, Catalytic Converter ............. 37
MID 128 PPID 436 Exhaust Gas Temperature Sensor 3 ..................... 38
MID 128 PPID 437 Aftertreatment Injector Fuel Pressure Sensor ...... 39
MID 128 PSID 47 Particulate Trap Regeneration ................................ 40
MID 128 PSID 98 Boost Air System .................................................... 40
MID 128 PSID 108 Aftertreatment Injection System ........................... 41
MID 128 PSID 109 Engine Coolant Temperature Sensor .................... 42
MID 128 SID 1/2/3/4/5/6 Unit Injector .................................................. 43
MID 128 SID 18 Drain Valve, Water Separator .................................... 44
MID 128 SID 21 Engine Position Timing Sensor ................................. 45
MID 128 SID 22 Engine Speed Sensor ............................................... 46
MID 128 SID 27 Variable Geometry Turbocharger .............................. 47
MID 128 SID 33 Fan Control ................................................................ 48
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MID 128 SID 70 Preheater Element 1 .................................................
MID 128 SID 71 Preheater Element 2 .................................................
MID 128 SID 146 EGR Valve 1 ............................................................
MID 128 SID 211 5 Volt DC Supply .....................................................
MID 128 SID 230 Idle Validation Switch 1 ...........................................
MID 128 SID 232 5 Volt DC Supply to Sensor .....................................
48
49
49
50
50
51

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Group 28 Design and Function

Group 28
Design and Function
Engine Control System
The “Premium Tech Tool” (PTT) is the preferred
tool for performing diagnostic work. Contact
your local dealer for more information or visit
“www.premiumtechtool.com”.

System Overview
Five electronic control modules are used; the Engine an intermittent code or condition, it may be necessary
Management System (EMS) Module, Instrument Cluster to use a diagnostic computer connected to the Serial
Module (ICM), Vehicle Electronic Control Unit (VECU), Communication Port.
Transmission Electronic Control Unit (TECU) and
the Gear Selector Electronic Control Unit (GSECU). Additional data and diagnostic tests are available
Together, these modules operate and communicate when a diagnostic computer is connected to the Serial
through the J1939 high speed serial data line to control Communication Port.
a variety of engine and vehicle cab functions. The
For diagnostic software, contact your local dealer.
Engine Management System (EMS) Module controls
fuel timing and delivery, fan operation, engine protection The Vehicle Electronic Control Unit (VECU) is mounted
functions, engine brake operation, the EGR valve, and the on a panel below the top dash access panel in the center
turbocharger nozzle. The Vehicle Electronic Control Unit of the dash on conventional models. The VECU is a
(VECU) controls cruise control functions, accessory relay microprocessor based controller programmed to perform
controls and idle shutdown functions. The Instrument several functions, these include:
Cluster Module (ICM) primarily displays operational
parameters and communicates these to the other ECU’s. • Driver controls
All have the capability to communicate over the J1587 • Vehicle and engine speed controls
normal speed data lines primarily for programming, • Starter control
diagnostics and data reporting. • Cab power
• Idle controls
In addition to their control functions, the modules • Broadcasting data on the serial data lines
have on-board diagnostic capabilities. The on-board • Trip data logging
diagnostics are designed to detect faults or abnormal • Diagnostic fault logging and password processing
conditions that are not within normal operating
parameters. When the system detects a fault or abnormal The VECU performs these functions by monitoring the
condition, the fault will be logged in one or both of the signals from sensors and switches, and data received
modules’ memory, the vehicle operator will be advised over the serial data lines from the other ECU’s. The
that a fault has occurred by illumination a malfunction VECU directly monitors the Throttle Position (TP) Sensor
indicator lamp and a message in the driver information and Vehicle Speed Sensor (VSS).
display, if equipped. The module may initiate the engine
shutdown procedure if the system determines that the The VECU also monitors the position or state of a number
fault could damage the engine. of switches to perform its control and diagnostic functions.
They are:
In some situations when a fault is detected, the system
will enter the "limp home" mode. The limp home mode • A/C Pressure Switch
allows continued vehicle operation but the system may • Air Suspension Height Control Switch
substitute a sensor or signal value that may result in • Differential Lock Switch
poor performance. In some instances, the system will • Engine Brake Switches
continue to function but engine power may be limited to • Ignition Key Switch
protect the engine and vehicle. Fault codes logged in the • PTO Switches (if equipped)
system memory can later be read, to aid in diagnosing • Service and Park Brake Switches
the faults, with a diagnostic computer or through the • Speed Control Switches (Set/Decel, Resume/Accel)
instrument cluster display, if equipped. When diagnosing • 5th Wheel Slide Switch

3
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Group 28 Design and Function

The EMS is a microprocessor based controller • Engine Coolant Level (ECL) Sensor
programmed to perform fuel injection quantity and timing • Engine Coolant Temperature (ECT) Sensor
control, diagnostic fault logging, and to broadcast data to • Engine Oil Pressure (EOP) Sensor
other modules. The fuel quantity and injection timing to • Engine Oil Level (EOL) Sensor
each cylinder is precisely controlled to obtain optimal fuel • Engine Oil Temperature (EOT) Sensor
economy and reduced exhaust emissions in all driving • Exhaust Temperature Sensor (DPF Sensors)
situations. • Fuel Pressure Sensor

The EMS controls the operation of the Electronic Unit

• Intake Air Temperature And Humidity (IATH) Sensor

Injectors (EUIs), engine brake solenoid, EGR valve,

• Intake Manifold (Boost) Temperature Sensor

turbocharger nozzle position, and cooling fan clutch

• Throttle Position (TP) Sensor

based on input information it receives over the serial data

• Turbo Speed Sensor

lines and from the following sensors:

• Variable Geometry Turbocharger (VGT) Position
Sensor
• Ambient Air Temperature Sensor
The Vehicle Electronic Control Unit (VECU) and Engine
• Ambient Pressure sensor
Management System (EMS) Module are dependent on
• Boost Air Pressure (BAP) Sensor
each other to perform their specific control functions. In
• Camshaft Position (Engine Position) Sensor
addition to switch and sensor data the broadcast of data
• Cooling Fan Speed (CFS) Sensor
between modules also includes various calculations and
• Crankshaft Position (Engine Speed) Sensor
conclusions each module has developed, based on the
• Differential Pressure DPF Sensor
input information it has received.
• EGR Differential Pressure Sensor
• EGR Temperature Sensor

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Group 28 Design and Function

Sensors
Ambient Air Temperature Sensor
The Ambient Air Temperature Sensor is used to detect the
outside air temperature. The sensor modifies a voltage
signal from the ECM. The modified signal returns to the
ECM as the ambient air temperature. The sensor uses a
thermistor that is sensitive to the change in temperature.
The electrical resistance of the thermistor decreases as
temperature increases.

The Ambient Air Temperature Sensor is located in the

front of the vehicle.

Ambient (Atmospheric) Pressure Sensor

The Ambient (Atmospheric) Pressure Sensor contains a
pressure sensitive diaphragm and an electrical amplifier.
Mechanical pressure applied to the diaphragm causes
the diaphragm to deflect and the amplifier to produce an
electrical signal proportional to the deflection.
The Ambient (Atmospheric) Pressure Sensor is built into
the Engine Management System (EMS) Module.

Camshaft Position Sensor

The Camshaft Position (Engine Position) Sensor is
located in the rear face of the timing gear cover at the
rear of the engine, near the bottom of the valve cover. It
uses magnetic induction to generate a pulsed electrical
signal. It senses the passage of seven (7) timing bumps
on the edge of the camshaft dampener. Six of the holes
correspond to the phasing of the electronic unit injectors,
while the seventh hole indicates the top dead center
position.

Cooling Fan Speed (CFS) Sensor

On engines with an electronically controlled viscous fan
drive, the electronic fan drive contains a Hall effect speed
sensor. When the engine is running, a series of vanes in
the fan drive housing rotates past a magnet in the fan
drive solenoid generating a pulsed voltage signal. The
Engine Management System (EMS) Module monitors
the status if the air conditioning system and signals from
the Engine Coolant Temperature (ECT) Sensor, the
Engine Oil Temperature (EOT) Sensor, and the Engine
Speed/Timing (RPM/TDC) Sensor and calculates the
optimal cooling fan speed.
The Cooling Fan Speed Sensor is located in the fan drive
on the front of the engine.

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Group 28 Design and Function

Crankshaft Position (Engine Speed) Sensor

The Crankshaft Position (Engine Speed) Sensor uses
magnetic induction to generate a pulsed electrical signal.
Notches are machined into the edge of the flywheel.
When one of the notches passes close to the sensor,
electric pulses result.

The Crankshaft Position (Engine Speed) Sensor also

indicates when the crankshaft is at the top dead center
position.

Differential Pressure DP Sensor

The differential pressure sensor is used for flow
measurement of the Diesel Particulate Filter (DPF). This
sensor has two pressure ports and senses the difference
in pressure between the two ports. Measurement of the
pressure before and after the DPF is used to calculate
diesel filter regeneration.

The Differential Pressure DPF Sensor is located on the

side of the Diesel Particulate Filter (DPF).

EGR Differential Pressure Sensor

The EGR differential pressure sensor is used for flow
measurement of the Exhaust Gas Recirculation (EGR)
valve. This sensor has two pressure ports and senses
the difference in pressure between the two ports.
Measurement of the pressure before and after the EGR
valve is used to calculate EGR flow.

The EGR Differential Pressure Sensor is located on the

left or right side of the engine.

EGR Temperature Sensor

The EGR temperature sensor detects exhaust gas
temperature for EGR system. The sensor modifies a
voltage signal from the control unit. The modified signal
returns to the control unit as the exhaust temperature
of the EGR system to confirm EGR operation. The
sensor uses a thermistor that is sensitive to the change
in temperature.

The EGR Temperature Sensor is located near the EGR

valve.

Engine Coolant Level (ECL) Sensor

The Engine Coolant Level (ECL) Sensor is a switch. If
engine coolant level falls below a calibrated point the
contacts open and the driver will be notified of the low
coolant level.
The Engine Coolant Level (ECL) Sensor is located in the
cooling system reservoir tank.

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Group 28 Design and Function

Engine Coolant Temperature (ECT) Sensor

The Engine Coolant Temperature Sensor is located at
the front of the engine. The sensor will indicate a high
coolant temperature caused by problems like radiator
blockage, thermostat failure, heavy load, or high ambient
temperatures. This sensor is also used for cold start
enhancement and for fan clutch engagement.

Engine Oil Pressure (EOP) Sensor

The Engine Oil Pressure Sensor contains a pressure
sensitive diaphragm and a electrical amplifier. Mechanical
pressure applied to the diaphragm causes the diaphragm
to deflect and the amplifier to produce an electrical signal
proportional to the deflection.
The Engine Oil Pressure Sensor is located on the oil filter
assembly. The sensor monitors engine oil pressure to
warn of lubrication system failure.

Engine Oil Level (EOL) Sensor

The Engine Oil Level Sensor is located in the oil pan.

Engine Oil Temperature (EOT) Sensor

The Engine Oil Temperature Sensor is a thermistor
whose resistance varies inversely to temperature. The
sensor has a negative temperature coefficient, which
means the sensor resistance will decrease as the engine
oil temperature increases.

The Engine Oil Temperature Sensor is located in the oil

pan.

Exhaust Temperature Sensor (DPF Sensors)

The exhaust gas temperature sensor detects exhaust
gas temperature for DPF protection as well as DPF
regeneration control. The sensor modifies a voltage
signal from the control unit. The modified signal returns to
the control unit as the exhaust temperature at that specific
location of the exhaust. The sensor uses a thermistor that
is sensitive to the change in temperature.

The Exhaust Temperature Sensors are located in the

DPF assembly.

Fuel Pressure Sensor

The fuel pressure sensor contains a diaphragm that
senses fuel pressure. A pressure change causes the
diaphragm to flex, inducing a stress or strain in the
diaphragm. The resistor values in the sensor change in
proportion to the stress applied to the diaphragm and
produces an electrical output.

The Fuel Pressure Sensor is located on top of the fuel

filter housing.

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Group 28 Design and Function

Intake Air Temperature and Humidity (IATH) Sensor

The Intake Air Temperature and Humidity (IATH)
Sensor contains a thermistor and a capacitive sensor.
The resistance of the thermistor varies inversely to
temperature. The output of the capacitive sensor
increases as the humidity of the surrounding air increases.
By monitoring the signals from both portions of the
sensor, the Engine Management System (EMS) Module
calculates the temperature and humidity of the air passing
through the air filter housing.

The Intake Air Temperature and Humidity (IATH) Sensor

is located in the air intake tube just downstream from the
air filter canister.

Intake Manifold (Boost) Temperature Sensor

The Intake Manifold (Boost) Temperature Sensor is
a thermistor whose resistance varies inversely to
temperature. The sensor has a negative temperature
coefficient, which means the sensor resistance will
decrease as the inlet air temperature increases.

The Intake Manifold (Boost) Temperature Sensor is

located in the intake manifold.

Intake Manifold Pressure Sensor

The Intake Manifold Pressure Sensor contains a
pressure sensitive diaphragm and an electrical amplifier.
Mechanical pressure applied to the diaphragm causes
the diaphragm to deflect and the amplifier to produce an
electrical signal proportional to the deflection.

The Intake Manifold Pressure Sensor is located on the air

inlet pipe before the intake manifold.

Throttle Position (TP) Sensor

The Throttle Position Sensor is a potentiometer that
is mechanically linked to the accelerator pedal. A
potentiometer is a variable resistor whose resistance
will change as the pedal is pressed. As the resistance
changes, the signal voltage of the sensor changes
indicating the accelerator pedal position.

The Throttle Position Sensor is located above the

accelerator pedal. The sensor is designed to improve the
driver’s control by reducing sensitivity to chassis motion.
This sensor provides the driver’s fuel request input to the
VECU.

Turbo Speed Sensor

The Turbo Speed Sensor informs the EMS of the turbo
shaft speed. The sensor does not read from the vanes,
but reads from the shaft. The Engine Management
System (EMS) Module uses this signal in conjunction with
the VGT position sensor signal to control the speed of the
turbocharger and therefore optimize the intake manifold
pressure.

The Turbo Speed Sensor is mounted in the center of the

turbocharger.

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Group 28 Design and Function

Variable Geometry Turbocharger Smart Remote Actuator (VGT SRA)

The Variable Geometry Turbocharger Smart Remote
Actuator (VGT SRA) takes the position commands from
the EMS, moves the nozzle of the turbocharger to the
desired position, and performs all of the diagnostics and
self checks on the actuator.

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10
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Group 28 Troubleshooting

Troubleshooting
Engine ECU, Fault Tracing
The “Premium Tech Tool” (PTT) is the preferred
tool for performing diagnostic work. Contact
your local dealer for more information or visit
“www.premiumtechtool.com”.

The control units on the information link communicate

according to the SAE J1587 standard. The standard
has been extended with Volvo’s own supplement
(PPID, PSID). The fault codes set by the control units
contain information that is described by the following
abbreviations.

MID Message Identification Description: SID Subsystem Identification Description:

Identification of a control unit. Identification of a component.
PID Parameter Identification Description: PSID Proprietary Subsystem Identification
Identification of a parameter (value). Description Volvo:
Unique identification of a component.
PPID Proprietary Parameter Identification
Description Volvo: FMI Failure Mode Identifier:
Unique identification of a parameter Identification of fault types.
(value).

FMI Table
FMI Display Text SAE Text
0 Value to high Data valid, but above the normal working range
1 Value too low Data valid, but below the normal working range
2 Incorrect data Intermittent or incorrect data
3 Electrical fault Abnormally high voltage or short circuit to higher voltage
4 Electrical fault Abnormally low voltage or short circuit to lower voltage
5 Electrical fault Abnormally low current or open circuit
6 Electrical fault Abnormally high current or short circuit to ground
7 Mechanical fault Incorrect response from a mechanical system
8 Mechanical or electrical fault Abnormal frequency
9 Communication fault Abnormal update rate
10 Mechanical or electrical fault Abnormally strong vibrations
11 Unknown fault Non-identifiable fault
12 Component fault Faulty unit or component
13 Incorrect calibration Calibration values outside limits
14 Unknown fault Special instructions
15 Unknown fault Reserved for future use

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Group 28 Troubleshooting

Engine ECU, Fault Tracing

PID
“MID 128 PID 26 Fan Speed Percent” page 14
“MID 128 PID 45 Preheater Relay” page 14
“MID 128 PID 81 Particulate Filter” page 15
“MID 128 PID 84 Vehicle Speed” page 15
“MID 128 PID 85 Cruise Control Status” page 15
“MID 128 PID 91 Accelerator Pedal Position” page 16
“MID 128 PID 94 Fuel Delivery Pressure” page 16
“MID 128 PID 97 Water in Fuel Indicator” page 17
“MID 128 PID 98 Engine Oil Level” page 17
“MID 128 PID 100 Engine Oil Pressure” page 18
“MID 128 PID 102 Intake Manifold Pressure” page 19
“MID 128 PID 103 Turbo Speed” page 20
“MID 128 PID 105 Intake Manifold Temperature” page 21
“MID 128 PID 108 Atmospheric Pressure” page 22
“MID 128 PID 110 Coolant Temperature” page 23
“MID 128 PID 111 Coolant Level” page 24
“MID 128 PID 153 Crankcase Pressure” page 25
“MID 128 PID 171 Ambient Temperature” page 26
“MID 128 PID 173 Exhaust Temperature” page 26
“MID 128 PID 175 Engine Oil Temperature” page 27
“MID 128 PID 354 Relative Humidity” page 28
“MID 128 PID 411 EGR Exhaust Back Pressure” page 29
“MID 128 PID 412 EGR Temperature” page 30

PPID
“MID 128 PPID 35 EGR Mass Flow” page 31
“MID 128 PPID 89 Variable Geometry Turbocharger Smart Remote Actuator Temperature” page 31
“MID 128 PPID 122 Engine Compression Brake” page 32
“MID 128 PPID 270 NOx Sensor” page 33
“MID 128 PPID 326 Soot Level” page 34
“MID 128 PPID 272 Air Pressure Compensation” page 34
“MID 128 PPID 328 Aftertreatment Injection Shutoff Valve” page 35
“MID 128 PPID 329 Aftertreatment Fuel Injector” page 35
“MID 128 PPID 330 DRV” page 36
“MID 128 PPID 337 Ash Level” page 37
“MID 128 PPID 387 Temperature Sensor, Catalytic Converter” page 37
“MID 128 PPID 436 Exhaust Gas Temperature Sensor 3” page 38
“MID 128 PPID 437 Aftertreatment Injector Fuel Pressure Sensor” page 39

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Group 28 Troubleshooting

PSID
“MID 128 PSID 47 Particulate Trap Regeneration” page 40
“MID 128 PSID 98 Boost Air System” page 40
“MID 128 PSID 108 Aftertreatment Injection System” page 41
“MID 128 PSID 109 Engine Coolant Temperature Sensor” page 42

SID
“MID 128 SID 1/2/3/4/5/6 Unit Injector” page 43
“MID 128 SID 18 Drain Valve, Water Separator” page 44
“MID 128 SID 21 Engine Position Timing Sensor” page 45
“MID 128 SID 22 Engine Speed Sensor” page 46
“MID 128 SID 27 Variable Geometry Turbocharger” page 47
“MID 128 SID 33 Fan Control” page 48
“MID 128 SID 70 Preheater Element 1” page 48
“MID 128 SID 71 Preheater Element 2” page 49
“MID 128 SID 146 EGR Valve 1” page 49
“MID 128 SID 211 5 Volt DC Supply” page 50
“MID 128 SID 230 Idle Validation Switch 1” page 50
“MID 128 SID 232 5 Volt DC Supply to Sensor” page 51

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Group 28 Troubleshooting

MID 128 PID 26 Fan Speed Percent

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Missing signal • Higher fuel • Cooling Fan Speed (CFS) sensor
normal or shorted from Fan Speed consumption failure
to high Sensor • Will work as • Faulty Cooling Fan Speed (CFS)
• Short Circuit +, on/off fan, sensor harness
Measuring line 100%fan speed
• Short Circuit -, if cooling is
Measuring line needed
• Open Circuit,
Measuring line
• Open Circuit,
Ground line

MID 128 PID 45 Preheater Relay

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short Circuit +, • Preheat relay not • Preheat relay solenoid shorted
normal or shorted Measuring line activated
to high • White smoke for
cold start
• Start problems in
cold climate
FMI 4
• Voltage below • Short Circuit -, • Induction air is • Faulty harness
normal or shorted Measuring line hot
low
• Preheat relay
is impossible to
turn off
FMI 5
• Current below • Open Circuit • Preheat relay not • Faulty Preheat relay
normal or open activated • Faulty harness
circuit • White smoke for
cold start
• Start problems in
cold climate

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Group 28 Troubleshooting

MID 128 PID 81 Particulate Filter

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Moderately high • Engine derate • Particulate Trap Pressure (PTP)
above normal pressure • Malfunction Sensor failure
operational indicator lamp
range-most severe illuminated
level
FMI 2
• Data erratic, • Sensor is not • Malfunction • Particulate Trap Pressure (PTP)
intermittent or rational indicator lamp Sensor failure
incorrect illuminated
FMI 3
• Voltage above • Short to battery • Malfunction • Particulate Trap Pressure (PTP)
normal or shorted on the metering indicator lamp Sensor failure
high side illuminated • Faulty Particulate Trap Pressure
• Open in the (PTP) Sensor connector
ground line • Faulty harness
FMI 5
• Current below • Open in 5 volt • Malfunction • Particulate Trap Pressure (PTP)
normal or open supply line indicator lamp Sensor failure
• Short to ground illuminated • Faulty harness
in metering line
• Open in metering
line
FMI 12
• Bad intelligent • Particulate Trap • Engine derate • Diesel Particulate Filter (DPF) is
device or Pressure (PTP) damaged, filled with soot or missing
component Sensor signal
high or low but
still within range

MID 128 PID 84 Vehicle Speed

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 9
• Abnormal update • Missing signal • Engine derate • J1708 vehicle speed message does
rate from VECU not exist, (VECU error)

MID 128 PID 85 Cruise Control Status

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 9
• Abnormal update • Missing (Cruise • Cruise Control • No clutch info to EMS (J1939)
rate Control) signal does not work
from VECU

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Group 28 Troubleshooting

MID 128 PID 91 Accelerator Pedal Position

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 9
• Abnormal update • Missing signal • N/A • J1708 pedal information not
rate from VECU available

MID 128 PID 94 Fuel Delivery Pressure

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 1
• Pressure critically • EMS module • Rough idle • A clogged fuel filter
low detects a low fuel • Uneven running • Fuel leaking from a fuel line or fitting
pressure reading • Engine derate • Poor fuel pump pressure
• Low fuel level
FMI 3
• Voltage high/open • Low Fuel • Engine derate • Damaged contacts in harness
Pressure (FP) • Malfunction • Faulty Fuel Pressure (FP) sensor
Sensor signal indicator lamp • Open circuit.
line voltage illuminated
FMI 5
• Current low/open • Low Fuel • Engine derate • Damaged contacts in harness
Pressure (FP) • Malfunction • Faulty Fuel Pressure (FP) sensor
Sensor signal indicator lamp
line voltage illuminated
FMI 7
• Current low/open • Drop in fuel • Engine derate • Clogged fuel filter
pressure • Malfunction • Leaking fuel line or fitting
indicator lamp • Poor fuel pump response
illuminated

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Group 28 Troubleshooting

MID 128 PID 97 Water in Fuel Indicator

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage high/open • N/A • Undetected • Open circuit
water in fuel
supply
• Uneven running
• Malfunction
indicator lamp
illuminated
FMI 4
• Voltage low • N/A • Undetected • Short to ground
water in fuel • Open circuit
supply • Faulty sensor
• Uneven running
• Malfunction
indicator lamp
illuminated

MID 128 PID 98 Engine Oil Level

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 1
• Data valid but • Moderately • N/A • Low oil level Leakage
below normal below range • Critically low oil level Leakage
operational range • Critically below
range
FMI 4
• Voltage below • Short Circuit - • Oil level can not • Engine Oil Level (EOL) sensor
normal or shorted Positive side be measured failure
low • Faulty harness
FMI 5
• Current below • Short Circuit +, • Oil level can not • Engine Oil Level (EOL) sensor
normal or open Positive side be measured failure
circuit • Open Circuit +, • Faulty harness
Positive side
• Open Circuit-
Negative side

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Group 28 Troubleshooting

MID 128 PID 100 Engine Oil Pressure

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 1
• Data valid but • Critically below • Engine derate • Oil leakage
below normal range • Low pressure • Broken oil pump
operational range • Clogged oil system
FMI 3
• Voltage below • Short Circuit +, • Oil pressure • Engine Oil Pressure (EOP) sensor
normal or shorted Measuring line shows 0 in the failure
low • Open Circuit, cluster, engine is • Faulty harness
Ground line running
FMI 5
• Current below • Open Circuit +, • Oil pressure • Engine Oil Pressure (EOP) sensor
normal or open 5V Supply line shows 0 in the failure
circuit • Short Circuit -, cluster, engine is • Faulty harness
Measuring line running
• Open Circuit,
Measuring line

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Group 28 Troubleshooting

MID 128 PID 102 Intake Manifold Pressure

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Intake Manifold • Engine derate • Variable Geometry Turbo (VGT)
above normal Pressure Sensor • Malfunction actuator stuck
operational range output is high indicator lamp • Faulty Intake Manifold Pressure
• Intake Manifold illuminated Sensor harness
Pressure is • Intake Manifold Pressure Sensor
indicating an failure
unphysical value
FMI 1
• Data valid but • Intake Manifold • Engine derate • Intermittent fault in the Intake
below normal Pressure Sensor • Malfunction Manifold Pressure Sensor harness
operational range is indicating an indicator lamp • Faulty Boost Air Pressure connector
unphysical value illuminated • Intake Manifold Pressure Sensor
failure
FMI 2
• Data erratic, • Intake Manifold • Engine derate • Intermittent fault in the Intake
intermittent or Pressure Sensor • Malfunction Manifold Pressure Sensor harness
incorrect output is too high indicator lamp • Faulty Boost Air Pressure connector
or too low illuminated • Intake Manifold Pressure Sensor
failure
FMI 3
• Voltage above • A short to battery • Engine derate • Intermittent fault in the Intake
normal or shorted in the metering • Malfunction Manifold Pressure Sensor harness
to high source circuit indicator lamp • Faulty Boost Air Pressure connector
• An open in illuminated • Intake Manifold Pressure Sensor
the ground failure
circuit of the
Intake Manifold
Pressure Sensor
FMI 5
• Current below • A short to ground • Engine derate • Intermittent fault in the Intake
normal or open in the harness • Malfunction Manifold Pressure Sensor harness
circuit • An open in the 5 indicator lamp • Faulty Boost Air Pressure connector
volt supply circuit illuminated • Intake Manifold Pressure Sensor
• An open in the failure
metering circuit
FMI 11
• Root cause not • Intake Manifold • Engine derate • Faulty Intake Manifold Pressure
known (Data Pressure Sensor • Malfunction Sensor harness
Incorrect) output is too high indicator lamp • Inlet air leakage
or low illuminated • Intake Manifold Pressure Sensor
failure

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Group 28 Troubleshooting

MID 128 PID 103 Turbo Speed

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Turbocharger • Engine derate • Miss detection
above normal speed is at least • Malfunction • Faulty Turbo Speed Sensor harness
operational range 25% greater than indicator lamp • Faulty Turbo Speed Sensor
the target wheel illuminated connector
speed for the • Turbo Speed Sensor failure
measured boost
FMI 1
• Data valid but • Turbocharger • Engine derate • Miss detection
below normal speed is at least • Malfunction • Faulty Turbo Speed Sensor harness
operational range 25% less than indicator lamp • Faulty Turbo Speed Sensor
the target wheel illuminated connector
speed for the • Turbo Speed Sensor failure
measured boost
FMI 9
• Abnormal update • A fault is logged if • Engine derate • Communication fault in the metering
rate (missing the Turbo Speed • Malfunction line of the Turbo Speed Sensor
sensor signal) Sensor signal is indicator lamp circuit
lost illuminated • Short to ground in the metering line
of the Turbo Speed Sensor circuit
• An open in the metering line of the
Turbo Speed Sensor circuit

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Group 28 Troubleshooting

MID 128 PID 105 Intake Manifold Temperature

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • The Intake • Engine derate • Faulty Intake Manifold Temperature
above normal Manifold • Malfunction Sensor or Engine Management
operational range Temperature indicator lamp System (EMS) Module connector
Sensor is illuminated • Temperature Sensor harness
indicating an • Malfunction Intake Manifold
unphysical value Temperature Sensor
FMI 1
• Data valid but • The Boost • Minor engine • Faulty Intake Manifold Temperature
below normal Temperature derate Sensor or Engine Management
operational range Sensor is • Malfunction System (EMS) Module connector
indicating an indicator lamp • Break in the Intake Manifold
unphysical value illuminated Temperature Sensor harness
• Malfunction Intake Manifold
Temperature Sensor
FMI 2
• Data erratic, • The Intake • Engine derate • Faulty Intake Manifold Temperature
intermittent or Manifold • Malfunction Sensor or Engine Management
incorrect Temperature indicator lamp System (EMS) Module connector
Sensor output is illuminated • Break in the Intake Manifold
too high or too Temperature Sensor harness
low • Malfunction Intake Manifold
Temperature Sensor
FMI 4
• Voltage below • N/A • Difficult to start • Short circuit
normal or shorted in cold climates • Intermittent fault in the Intake
low • Engine derate Manifold Temperature Sensor
• Malfunction harness
indicator lamp • Faulty Intake Manifold Temperature
illuminated Sensor connector
• Intake Manifold Temperature Sensor
failure
FMI 5
• Current below • A short to battery • Difficult to start • A short circuit in the metering circuit
normal or open • An open in the 5 in cold climates • Intermittent fault in the Intake
circuit volt supply circuit • Engine derate Manifold Temperature Sensor
• Malfunction harness
indicator lamp • Faulty Intake Manifold Temperature
illuminated Sensor connector
• Intake Manifold Temperature Sensor
failure
FMI 10
• Abnormal rate of • The Boost • Engine derate • Faulty Intake Manifold Temperature
change Temperature • Malfunction Sensor harness
Senor output indicator lamp • Intake Manifold Temperature Sensor
is showing a illuminated failure
constant value

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Group 28 Troubleshooting

MID 128 PID 108 Atmospheric Pressure

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Atmospheric • Minor engine • Faulty Atmospheric Pressure Sensor
intermittent or Pressure Sensor derate • Faulty Engine Management System
incorrect output is too (EMS) Module
high or too low
(abnormal value)
FMI 3
• Voltage above • Short to battery • N/A • Internal fault in the Engine
normal or shorted on the metering Management System (EMS) Module
to high source side • Faulty Atmospheric Pressure Sensor
FMI 4
• Voltage below • A short to ground • N/A • Internal fault in the Engine
normal or shorted on the metering Management System (EMS) Module
to low source side • Faulty Atmospheric Pressure Sensor

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Group 28 Troubleshooting

MID 128 PID 110 Coolant Temperature

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • The Engine • Malfunction • Extreme driving condition
above normal Coolant indicator lamp • Faulty coolant thermostat
operational range Temperature illuminated • Malfunctioning fan
(ECT) Sensor • Blocked radiator
is indicating an
unphysical value
FMI 2
• Data erratic, • The Engine • May affect • Faulty Engine Coolant Temperature
intermittent or Coolant driveability in (ECT) Sensor or Engine
incorrect Temperature extreme cases Management System (EMS)
(ECT) Sensor • Malfunction Module connector
output is too high indicator lamp • Break in Engine Coolant
or too low illuminated Temperature (ECT) Sensor
harness
• Malfunctioning Engine Coolant
Temperature (ECT) Sensor
FMI 4
• Voltage below • N/A • Difficult to start • Internal fault in the Engine Coolant
normal or shorted in cold climates Temperature (ECT) Sensor harness
low • Idle run • Faulty Engine Coolant Temperature
regulation is (ECT) Sensor connector
deteriorated • Faulty Engine Coolant Temperature
• Malfunction (ECT) Sensor
indicator lamp
illuminated
FMI 5
• Current below • N/A • Difficult to start • An open in the Engine Coolant
normal or open in cold climates Temperature (ECT) Sensor circuit
circuit • Idle run • An open in the Engine Coolant
regulation is Temperature (ECT) Sensor
deteriorated • Intermittent fault in the Engine
• Malfunction Coolant Temperature (ECT) Sensor
indicator lamp • Faulty Engine Coolant Temperature
illuminated (ECT) Sensor connector
• Faulty Engine Coolant Temperature
(ECT) Sensor
FMI 10
• Abnormal rate of • The Engine • May affect • Faulty Engine Coolant Temperature
change Coolant vehicle (ECT) Sensor harness
Temperature driveability • Engine Coolant Temperature (ECT)
(ECT) Sensor Sensor failure
output is showing
a constant value

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Group 28 Troubleshooting

MID 128 PID 111 Coolant Level

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 1
• Data valid but • Moderately • Engine derate • Coolant level below range
below normal below range • Faulty harness
operational range • Critically below • Engine shutdown
range
• Short Circuit -,
Measuring line
FMI 3
• Voltage above • Short Circuit + • Coolant level can • Faulty harness
normal or shorted Measuring line not be detected
to high source
FMI 4
• Voltage below • Short Circuit -, • Coolant level can • Faulty harness
normal or shorted Measuring line not be detected
low
FMI 5
• Current below • Open Circuit • Coolant level can • Faulty harness
normal or open not be detected
circuit

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Group 28 Troubleshooting

MID 128 PID 153 Crankcase Pressure

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Out of range, • Forced idle • The non-filtered pressure difference
above normal max voltage, • Engine shut (between crankcase pressure and
operational range illegal down ambient air pressure) is/was above
• Critically Above limit. (The fault code will remain
Range during the entire driving cycle
(unless reset)
FMI 1
• Data valid but • Out of range, min • N/A • Crankcase Pressure Sensor out of
below normal voltage, illegal range
operational range
FMI 2
• Data erratic, • Plausibility • N/A • The crankcase pressure is showing
intermittent or either too high or too low value
incorrect (abnormal value)
FMI 3
• Voltage above • Short Circuit +, • N/A • Crankcase Pressure Sensor failure
normal or shorted Measuring line • Faulty harness
to high source • Open Circuit,
Ground line
FMI 5
• Current below • Open Circuit +, • N/A • Crankcase Pressure Sensor failure
normal or open 5V Supply Line • Faulty harness
circuit • Short Circuit -,
Measuring line
• Open Circuit,
Measuring line

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Group 28 Troubleshooting

MID 128 PID 171 Ambient Temperature

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 9
• Abnormal Update • This fault will • Malfunction • Faulty Ambient Air Temperature
Rate become active indicator lamp Sensor harness
when the Engine illuminated
Management
System (EMS)
Module detects
that the Ambient
Air Temperature
message from
the Instrument
Cluster Module
does not exist.

MID 128 PID 173 Exhaust Temperature

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Exhaust Gas • Engine derate • Faulty Exhaust Gas Temperature
above normal Temperature is • Poor driveability (EGT) system
operational range too high • Faulty harness or connector
— most severe
level
FMI 2
• Data erratic, • Sensor is not • Poor driveability • Harness connected to incorrect
intermittent or rational sensor
incorrect • Sensor failure
FMI 4
• Voltage below • Short to ground • Poor driveability • Sensor failure
normal or shorted on the metering • Faulty harness
low side of the circuit
FMI 5
• Current below • Short to battery • Poor driveability • Faulty harness
normal or open on the metering • Sensor failure
circuit side of the circuit
• Open in the
metering side of
the circuit
• Open in the
ground side of
the circuit
FMI 10
• Abnormal rate of • Sensor is stuck • Poor driveability • Sensor failure
change

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Group 28 Troubleshooting

MID 128 PID 175 Engine Oil Temperature

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Moderately • Engine derate • Extreme driving conditions
above normal Above range
operational range • Critically Above
Range
FMI 2
• Data erratic, • Plausibility • In some cases • The oil temperature sensor output
intermittent or may have is showing either too high or to low
incorrect an effect on value (abnormal value)
driveability
FMI 4
• Voltage below • Short Circuit -, • N/A • Engine Oil Temperature (EOT)
normal or shorted Measuring line sensor failure
low • Faulty harness
FMI 5
• Current below • Short Circuit +, • N/A • Engine Oil Temperature (EOT)
normal or open Measuring line sensor failure
circuit • Open Circuit • Faulty harness

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Group 28 Troubleshooting

MID 128 PID 354 Relative Humidity

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short to battery • Turbocharger • Faulty connector
normal or shorted in the metering noise • Faulty Relative Humidity Sensor
to high source circuit of • Malfunction harness
the Relative indicator lamp • Faulty Relative Humidity Sensor
Humidity Sensor illuminated
• Open in the
ground circuit
of the Relative
Humidity Sensor
FMI 5
• Current below • Open in the • Turbocharger • Faulty connector
normal or open metering circuit noise • Faulty Relative Humidity Sensor
circuit of the Relative • Malfunction harness
Humidity Sensor indicator lamp • Faulty Relative Humidity Sensor
• Open in the 5 illuminated
volt supply circuit
of the Relative
Humidity Sensor
• Short to ground
in the metering
circuit of
the Relative
Humidity Sensor

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Group 28 Troubleshooting

MID 128 PID 411 EGR Exhaust Back Pressure

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • EGR differential • Uneven running • Faulty EGR Differential Pressure
intermittent or pressure sensor • Engine derate Sensor connector
incorrect output is too high • Faulty EGR Differential Pressure
or too low Sensor harness
• Faulty EGR Differential Pressure
Sensor
• EGR leakage
• Clogged EGR cooler
• Clogged EGR venturi
FMI 3
• Voltage above • Short to battery • Engine responds • Faulty EGR Differential Pressure
normal or shorted in metering line poorly Sensor connector
to high source • Open in the • Engine derate • Faulty EGR Differential Pressure
ground circuit Sensor harness
• Faulty EGR Differential Pressure
Sensor
FMI 5
• Current below • Open in the 5 volt • Engine responds • Faulty EGR Differential Pressure
normal or open supply line poorly Sensor connector
circuit • Short to ground • Engine derate • Faulty EGR Differential Pressure
in metering line Sensor harness
• Open in the • Faulty EGR Differential Pressure
metering line Sensor

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Group 28 Troubleshooting

MID 128 PID 412 EGR Temperature

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • N/A • Malfunction • Extreme driving conditions
above normal indicator lamp • EGR cooler failure
operational range illuminated
— most severe
level
FMI 4
• Voltage below • Short to ground • Engine responds • Faulty EGR Temperature Sensor
normal or shorted on the metering poorly connector
low side of the EGR • Engine power • Faulty EGR Temperature Sensor
Sensor circuit will be derated harness
according to the • Faulty EGR Temperature Sensor
error torque map
FMI 5
• Current below • Short to battery • Engine responds • Faulty EGR Temperature Sensor
normal or open in the metering poorly connector
circuit side of the EGR • Engine derate • Faulty EGR Temperature Sensor
Sensor circuit harness
• Open in the • Faulty EGR Temperature Sensor
metering side of
the EGR Sensor
circuit
• Open circuit in
the ground line of
the EGR Sensor
circuit
FMI 10
• Abnormal rate of • EGR sensor • Malfunction • Faulty EGR Temperature Sensor
change is showing a indicator lamp connector
constant value illuminated • Faulty EGR Temperature Sensor
that will not harness
change • EGR system leakage

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Group 28 Troubleshooting

MID 128 PPID 35 EGR Mass Flow

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • EGR flow is too • Poor driveability • Faulty EGR system
above normal high • Faulty harness or connector
operational range
— most severe
level
FMI 1
• Data valid but • EGR flow is too • Poor driveability • Faulty EGR system
below normal low • Clogged EGR cooler
operational range • Faulty harness or connector
— most severe
level

MID 128 PPID 89 Variable Geometry Turbocharger Smart Remote

Actuator Temperature
Type of FMI Description: Fault Condition: Possible Possible Cause
fault Symptoms:
FMI 0
• Data valid but • VGT SRA • Engine derate • Coolant system malfunction
above normal temperature is • Extreme driving conditions
operational moderately too • Overheated VGT actuator
range-most severe high
level

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Group 28 Troubleshooting

MID 128 PPID 122 Engine Compression Brake

Type of FMI Description: Fault Condition: Possible Possible Cause
fault Symptoms:
FMI 1
• Data valid but • Below range • No Volvo • Low engine oil temperature
above normal Compression
operational range Brake (VCB)
FMI 3
• Voltage above • Short Circuit + • Volvo • Faulty Volvo Compression Brake
normal or shorted Compression (VCB) actuator
to high source Brake (VCB) can • Faulty harness
not be turned on
• Engine brake
function derated
• Gear shift
performance
derated for
some automatic
transmission
boxes
FMI 4
• Voltage below • Short Circuit - • Volvo • Faulty Volvo Compression Brake
normal or shorted Compression (VCB) actuator
low Brake (VCB) can • Faulty harness
not be turned off
• Engine stops
running
• Engine
impossible to
restart
FMI 5
• Current below • Open Circuit • Volvo • Faulty Volvo Compression Brake
normal or open Compression (VCB) actuator
circuit Brake (VCB) can • Faulty harness
not be turned on
• Engine brake
function derated
• Gear shift
performance
derated for
some automatic
transmission
boxes

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Group 28 Troubleshooting

MID 128 PPID 270 NOx Sensor

MID 233 Fault code sent by MID 128 Engine
control unit.
Type of FMI Description: Fault Condition: Possible Possible Cause
fault Symptoms:
FMI 2
• Data erratic, • Removed • Malfunction • NOx sensor removed (measures
intermittent or • Plausibility indicator lamp surround air)
incorrect illuminated • Exhaust system leakage
• Air intake leakage
• Faulty NOx sensor
FMI 3
• Voltage above • Short Circuit, • N/A • Faulty cabling between NOx sensor
normal or shorted NOx signal and NOx sensor ECU
to high source • Faulty NOx sensor
FMI 5
• Current below • Open Circuit, • N/A • Faulty cabling between NOx sensor
normal or open NOx signal and NOx sensor ECU
circuit • Faulty NOx sensor
FMI 9
• Abnormal update • Abnormal update • N/A • Missing signal from NOx sensor
rate (missing
sensor signal
FMI 10
• Abnormal rate of • Stuck • N/A • Exhaust system leakage
change • Air intake leakage
• Faulty NOx sensor
FMI 12
• Bad Intelligent • Incorrect value • N/A • Faulty NOx sensor
Device or
Component
FMI 13
• Out of calibration • Range check • N/A • Faulty NOx sensor
FMI 14
• Special • Missing signal • N/A • Voltage to NOx sensor is too high
instructions from sensor due
to battery voltage

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Group 28 Troubleshooting

MID 128 PPID 272 Air Pressure Compensation

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 4
• Voltage below • Short Circuit - • Possible turbo • Faulty Intake Air Temperature and
normal or shorted noise Humidity (IATH) sensor
to low source • Faulty harness
• Faulty Intake Air Temperature and
Humidity (IATH) sensor connector
FMI 5
• Current below • Short Circuit + • Possible turbo • Faulty Intake Air Temperature and
normal or open • Open Circuit noise Humidity (IATH) sensor
circuit • Faulty harness
• Faulty Intake Air Temperature and
Humidity (IATH) sensor connector

MID 128 PPID 326 Soot Level

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Moderately high • Medium to high • Diesel Particulate Filter (DPF)
above normal soot load engine derate clogged
operational range • After Treatment Fuel Injector
clogged
• Regeneration disabled by driver or
other component
FMI 11
• Critically high soot • Critically high • High engine • Diesel Particulate Filter (DPF)
load soot load derate clogged
• Engine derate • After Treatment Fuel Injector
clogged
• Regeneration disabled by driver or
other component

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Group 28 Troubleshooting

MID 128 PPID 328 Aftertreatment Injection Shutoff Valve

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Circuit shorted to • Malfunction • Faulty harness
normal or shorted battery indicator lamp • Actuator failure
to high source illuminated
FMI 4
• Voltage below • Circuit shorted to • Malfunction • Faulty harness
normal or shorted ground indicator lamp • Actuator failure
low illuminated
FMI 5
• Current below • Open circuit • Malfunction • Faulty harness
normal or open indicator lamp • Actuator failure
circuit illuminated
FMI 7
• Mechanical system • After Treatment • Malfunction • Shut off valve stuck closed
not responding or Fuel Injector indicator lamp
out of adjustment stuck closed illuminated
FMI 14
• Special • After Treatment • Malfunction • After Treatment Fuel Injector failure
instructions Fuel Injector indicator lamp
leaking illuminated

MID 128 PPID 329 Aftertreatment Fuel Injector

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Circuit shorted to • Malfunction • Faulty harness
normal or shorted battery indicator lamp • Injector failure
to high source illuminated
FMI 4
• Voltage below • Circuit shorted to • Malfunction • Faulty harness
normal or shorted ground indicator lamp • Injector failure
low illuminated
FMI 5
• Current below • Open circuit • Malfunction • Faulty harness
normal or open indicator lamp • Injector failure
circuit illuminated
FMI 7
• Mechanical system • After treatment • Malfunction • After Treatment Fuel Injector failure
not responding or fuel injector indicator lamp
out of adjustment clogged illuminated
FMI 14
• Special • After Treatment • Malfunction • After Treatment Fuel Injector failure
instructions Fuel Injector indicator lamp
leaking illuminated

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Group 28 Troubleshooting

MID 128 PPID 330 DRV

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short circuit + • On/off valve can’t • Faulty Discharge Recirculator Valve
normal or shorted be activated (DRV) Solenoid
to high source • Regeneration • Faulty harness
not possible • Faulty Discharge Recirculator Valve
• High engine (DRV) Solenoid connector
braking without
request
• Driveability
affected
FMI 4
• Voltage below • Short circuit- • Valve constantly • Faulty Discharge Recirculator Valve
normal or shorted activated (DRV) Solenoid
low • Major engine • Faulty harness
derate • Faulty Discharge Recirculator Valve
• Exhaust manifold (DRV) Solenoid connector
overheating
• Engine shut
down
FMI 5
• Current below • Open circuit • On/off valve can’t • Faulty Discharge Recirculator Valve
normal or open be activated (DRV) Solenoid
circuit • Regeneration • Faulty harness
not possible • Faulty Discharge Recirculator Valve
• High engine (DRV) Solenoid connector
braking without
request
• Driveability
affected
FMI 7
• Mechanical system • Mechanically • On/off valve can’t • Leaking pipes
not responding or Stuck be activated • Faulty Discharge Recirculator Valve
out of adjustment • Regeneration (DRV) Solenoid
not possible
• High engine
braking without
request
• Driveability
affected
• Valve constantly
activated
• Major engine
derate
• Exhaust manifold
overheating
• Engine shut
down

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Group 28 Troubleshooting

MID 128 PPID 337 Ash Level

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Ash level too high • Need service • Short intervals between filter
above normal regenerations
operational range
FMI 14
• Special • Igniters or fuel • Need service • Time and driving conditions require
instructions nozzle need component service
service

MID 128 PPID 387 Temperature Sensor, Catalytic Converter

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Sensor is not • Poor driveability • Harness connected to incorrect
intermittent or rational sensor
incorrect • Sensor failure
FMI 4
• Voltage below • Short to ground • Poor driveability • Faulty harness
normal or shorted on the metering • Sensor failure
low side of the circuit
FMI 5
• Current below • Short to battery • Poor driveability • Faulty harness
normal or open on the metering • Actuator failure
circuit side of the circuit
• Open in the
metering side of
the circuit
• Open in the
ground side of
the circuit
FMI 10
• Abnormal rate of • Sensor is stuck • Poor driveability • Sensor failure
change

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Group 28 Troubleshooting

MID 128 PPID 436 Exhaust Gas Temperature Sensor 3

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Sensor is not • Poor driveability • Harness connected to incorrect
intermittent or rational sensor
incorrect • Sensor failure
FMI 4
• Voltage below • Short to ground • Poor driveability • Faulty harness
normal or shorted on the metering • Sensor failure
low side of the circuit
FMI 5
• Current below • Short to battery • Poor driveability • Faulty harness
normal or open on the metering • Actuator failure
circuit side of the circuit
• Open in the
metering side of
the circuit
• Open in the
ground side of
the circuit
FMI 10
• Abnormal rate of • Sensor is stuck • Poor driveability • Sensor failure
change

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Group 28 Troubleshooting

MID 128 PPID 437 Aftertreatment Injector Fuel Pressure Sensor

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Sensor is not • N/A • Faulty shut off valve
intermittent or rational • Sensor failure
incorrect
FMI 3
• Voltage above • Short to battery • N/A • Faulty harness
normal or shorted on the metering • Sensor failure
to high source side
• Open in the
ground line
FMI 5
• Current below • Open circuit in • N/A • Faulty harness
normal or open the 5 volt supply • Sensor Failure
circuit • Short circuit to
ground in the
metering line
• Open circuit in
the metering line
FMI 10
• Abnormal rate of • After treatment • N/A • Sensor
change injector fuel • Faulty shut off valve
pressure sensor • Injector failure
stuck

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Group 28 Troubleshooting

MID 128 PSID 47 Particulate Trap Regeneration

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Plausability, too • Regeneration • Faulty After Treatment Injector
above normal high not possible
operational range
FMI 1
• Data valid but • Plausability, too • Regeneration • Faulty After Treatment Injector
below normal low not possible • Faulty Diesel Particulate Filter (DPF)
operational range catalyst
FMI 8
• Abnormal • Regeneration • N/A • N/A
frequency, pulse period too long
width or period
FMI 12
• Bad Intelligent • Regeneration • N/A • Clogged After Treatment Injector
Device or efficiency too low • Diesel Particulate Filter (DPF)
Component catalyst damaged
• Diesel Particulate Filter (DPF)
catalyst clogged

MID 128 PSID 98 Boost Air System

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 0
• Data valid but • Boost pressure • Turbocharger • EGR system failure
above normal is too high surge • Faulty turbocharger actuator
operational range
— most severe
level
FMI 1
• Data valid but • Boost pressure • Engine derate • Faulty Boost Air System hoses,
below normal is too low • Engine slow to pipes, brackets, cooler, EGR system
operational range respond components and turbo components
— most severe
level

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Group 28 Troubleshooting

MID 128 PSID 108 Aftertreatment Injection System

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 7
• Mechanical system • Mechanical • Regeneration • Faulty After Treatment Injection (ATI)
not responding, or problem not possible system
out of adjustment • Engine derate
• Engine shut
down

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Group 28 Troubleshooting

MID 128 PSID 109 Engine Coolant Temperature Sensor

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 7
• Thermostat • This fault will • Malfunction • Thermostat Blocked Closed
blocked closed become active indicator lamp • Faulty radiator fan
when the Engine illuminated • Clogged radiator
Management
System (EMS)
Module detects
that the
Engine Coolant
Temperature
(ECT) Sensor
output is high but
still with in the
acceptable range
for the sensor.
• The Coolant
Temperature
Sensor is
indicating a
high coolant
temperature.
FMI 12
• Thermostat • This fault will • Poor heat in cab • Thermostat Blocked Open
blocked open become active • Malfunction
when the Engine indicator lamp
Management illuminated
System (EMS)
Module detects
that the
Engine Coolant
Temperature
(ECT) Sensor
output is low but
still with in the
acceptable range
for the sensor.

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Group 28 Troubleshooting

MID 128 SID 1/2/3/4/5/6 Unit Injector

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage high/open • EMS module • Loss of power • Open circuit
detects a short • Uneven running
circuit to battery • Running on 3 to
on the low side 5 cylinders
of the Spill Valve • Malfunction
(SV)/Needle indicator lamp
Control Valve illuminated
(NCV).
FMI 5
• Current below • EMS detects a • Loss of power • Harness shorted or open
normal or open short circuit to • Uneven running • Faulty fuel injector solenoid
circuit battery positive, • Running on 3 to
a short circuit 5 cylinders
to ground, or an • Malfunction
open circuit on indicator lamp
the high side of illuminated
the SV/Needle
Control Valve
(NCV) or a Short
Circuit to ground
on the low side of
the SV/NCV.
FMI 7
• Mechanical system • Cylinder • Erratic engine • Clogged fuel injector(s)
not responding balancing data is idle speed • Low fuel pressure
above the limit • Poor Compression
• Improper valve adjustment
FMI 12
• Failed Device • Injector or • Loss of power • Injector solenoid resistance out of
(Low injector hold harness • Uneven running specification
current) resistance too • Malfunction • Harness resistance too high
high indicator lamp
illuminated
FMI 14
• Special • Fuel injector flow • Loss of power • Low injector flow
instructions is too low or high. • Uneven running • High injector flow
• Cylinder • Malfunction • Poor compression
compression indicator lamp
is low. illuminated

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Group 28 Troubleshooting

MID 128 SID 18 Drain Valve, Water Separator

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short Circuit + • Valve constantly • Faulty Water In Fuel (WIF) Solenoid
normal or shorted Measuring line shut Valve
to high source • Broken wire
FMI 4
• Voltage below • Short Circuit -, • High fuel • Faulty Water In Fuel (WIF) Solenoid
normal or shorted Measuring line consumption due Valve
low to fuel leakage • Broken wire
FMI 5
• Current below • Open Circuit • Valve constantly • Faulty Water In Fuel (WIF) Solenoid
normal or open shut Valve
circuit • Broken wire

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Group 28 Troubleshooting

MID 128 SID 21 Engine Position Timing Sensor

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Phase Error • Increased fuel • Faulty connector
intermittent or - Incorrect consumption • Faulty Engine Position Timing
incorrect correlation Sensor harness
between CAM • Faulty Engine Position Timing
and Crank Sensor
Sensor • Improper air gap
FMI 3
• Voltage above • Missing Signal • Increased • Faulty Engine Position Timing
normal, or shorted from Engine engine start time Sensor harness
to high source Position Timing • Loss of engine
Sensor power
• Open in the
Engine Position
Timing Sensor
Circuit
• Short to battery
in the Engine
Position Timing
Sensor Circuit
• Short to ground
in the Engine
Position Timing
Sensor Circuit
FMI 8
• Abnormal • Noisy Signal • Increased • Faulty Engine Position Timing
frequency, pulse from Engine engine start time Sensor harness
width or period Position Timing • Loss of engine • Faulty Engine Position Timing
Sensor power Sensor mounting
• Open in the
Engine Position
Timing Sensor
Circuit

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Group 28 Troubleshooting

MID 128 SID 22 Engine Speed Sensor

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Intermittent or • Increased fuel • Faulty connector
intermittent or weak signal consumption • Faulty Engine Speed Sensor
incorrect • Imprecise engine harness
timing • Faulty Engine Speed Sensor
• Increased fuel • Improper air gap
consumption
• Uneven cylinder
balancing
• Power loss
• Smoke
FMI 3
• Voltage above • Missing Signal • Increased • Faulty Engine Speed Sensor
normal, or shorted from Engine engine start time harness
to high source Speed Sensor • Vehicle may be in • Faulty Crank Sensor mounting
• Open in the limp home mode
Engine Speed • Loss of engine
Sensor Circuit power
• Short to battery
in the Engine
Speed Sensor
Circuit
• Short to ground
in the Engine
Position Timing
Sensor Circuit
FMI 8
• Abnormal • Erratic or • Increased fuel • Faulty Engine Speed Sensor
frequency, pulse intermittent consumption harness
width or period signal from • Imprecise engine • Faulty Engine Speed Sensor
Engine Speed timing mounting
Sensor • Increased fuel
• Open in the consumption
Engine Speed • Uneven cylinder
Sensor balancing
• Power loss
• Smoke

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Group 28 Troubleshooting

MID 128 SID 27 Variable Geometry Turbocharger

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 2
• Data erratic, • Smart remote • Low boost • Disturbance on CAN2 data lines
intermittent or actuator has • Low power
incorrect not seen a valid • Nozzle opens
command on • Smoke from
CAN2 engine
• Incorrect data
FMI 4
• Voltage below • Short to ground • Nozzle will open • Faulty SRA VGT connector
normal, or shorted resulting in low • Faulty SRA VGT harness
to low source power and low • Low battery voltage
boost
• SRA will
continue to
attempt and
maintain target
nozzle position
FMI 7
• Mechanical system • Mechanical • Low boost and • Actuator motor effort is temporarily
not responding or problem with smoke limited to prevent overheating
out of adjustment the VGT SRA • Possible engine • Restrictions detected when running
derate learn sequence
• Power loss in • SRA is slow to follow commands
some cases • SRA position is not tracking
when actuator command
motor has been
disabled
FMI 9
• Abnormal update • Data from the • Engine derated • Data line harness
rate SRA has been (major) • No supply to VGT actuator
missing for • EGR valve • VGT actuator
2-seconds closed • VGT SRA connector
FMI 13
• Out of calibration • Failed self- • N/A • Smart remote actuator
calibration

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Group 28 Troubleshooting

MID 128 SID 33 Fan Control

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short to positive • Malfunction • Broken Cooling Fan Actuator
normal, or shorted in the Cooling indicator lamp • Faulty Cooling Fan Actuator harness
To high source Fan control illuminated or connector
circuit
FMI 4
• Voltage below • Short to ground • Malfunction • Broken Cooling Fan Actuator
normal, or shorted in the Cooling indicator lamp • Faulty Cooling Fan Actuator harness
to low source Fan control illuminated or connector
circuit
• Output voltage
is 1/3 the supply
voltage
FMI 5
• Current below • Open in the • Malfunction • Broken Cooling Fan Actuator
normal or open Cooling Fan indicator lamp • Faulty Cooling Fan Actuator harness
circuit control circuit illuminated or connector

MID 128 SID 70 Preheater Element 1

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short Circuit +, • Fuse for shorting • Faulty Preheat Relay
normal or shorted Measuring line wire blown • Short in high side of Preheat Sense
to high source 1 circuit
FMI 4
• Voltage below • Short Circuit -, • Shorting wire • Preheat relay problem
normal or shorted Measuring line may break • Sense 1, Short Circuit -, Measuring
low line
FMI 5
• Current below • Open Circuit • May get start • Faulty Heating element
normal or open problems in cold • Broken wire
circuit climate

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Group 28 Troubleshooting

MID 128 SID 71 Preheater Element 2

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Short Circuit +, • Fuse for shorting • Faulty Preheat Relay
normal or shorted Measuring line wire blown • Short in high side of Preheat Sense
to high source 2circuit
FMI 4
• Voltage below • Short Circuit -, • Shorting wire • Preheat relay problem
normal or shorted Measuring line may break • Sense 2, Short Circuit -, Measuring
low line
FMI 5
• Current below • Open Circuit • May get start • Faulty Heating element
normal or open problems in cold • Broken wire
circuit climate

MID 128 SID 146 EGR Valve 1

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • Stuck EGR • Malfunction • Faulty EGR Control Valve actuator
normal, or shorted Control Valve indicator lamp • EGR Control Valve harness
To high source • EGR Control illuminated
Valve circuit • Engine derate
shorted to
positive
• EGR Control
Valve circuit
shorted to
ground
FMI 5
• Current below • Open EGR • Malfunction • Faulty EGR Control Valve actuator
normal or open Control Valve indicator lamp • EGR Control Valve harness
circuit Circuit illuminated
• Engine derate
FMI 7
• Mechanical • EGR Valve stuck • Engine derate • Faulty EGR Valve
System Not closed
Responding or
Out Of Adjustment
FMI 12
• Bad Intelligent • EGR Valve stuck • Engine derate • Faulty EGR Valve
Device or open
Component

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Group 28 Troubleshooting

MID 128 SID 211 5 Volt DC Supply

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • N/A • Strange • 5 volt reference circuit shorted to
normal, or shorted information positive
To high source displayed on • Faulty harness or connector
cluster • Faulty sensor power supply
• Poor driveability • MID 128 PID’s 94, 100 and 153 may
also be set
FMI 4
• Voltage Below • N/A • Strange • 5 volt reference circuit shorted to
Normal, or Shorted information ground
To Low Source displayed on • Faulty harness or connector
cluster • Faulty sensor power supply
• Poor driveability • MID 128 PID’s 94, 100 and 153 may
also be set

MID 128 SID 230 Idle Validation Switch 1

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • IVS signal • No IVS limp • Faulty connector
normal, or shorted shorted to home function • Faulty VECU
to high source voltage for pedal position • Short to voltage in signal circuit
harness
FMI 5
• Current Below • IVS signal • No IVS limp • Faulty connector
Normal or Open shorted to home function • Faulty VECU
Circuit ground or open for pedal position • Short to ground or open in signal
circuit harness

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Group 28 Troubleshooting

MID 128 SID 232 5 Volt DC Supply to Sensor

Type of FMI Description: Fault Condition: Possible Possible Cause:
fault: Symptoms:
FMI 3
• Voltage above • N/A • Strange • Poor driveability
normal, or shorted information • Faulty harness or connector
to high source displayed on • Faulty sensor power supply
cluster • MID 128 PID’s 26, 102 and 411 may
• Poor driveability also be set
FMI 4
• Voltage below • N/A • Strange • 5 volt reference circuit shorted to
normal or shorted information ground
to low source displayed on • Faulty harness or connector
cluster • Faulty sensor power supply
• Poor driveability • MID 128 PID’s 26, 102 and 411 may
also be set

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Volvo Truck North America a division of Volvo Group North America, Inc.
P.O. Box 26115, Greensboro, NC 27402-6115
Volvo Trucks Canada, Ltd.
5600A Cancross Court, Mississauga, Ontario L5R 3E9
http://www.volvotrucks.volvo.com

PV776-20184635 () 10.2008 © Volvo Truck North America a division of Volvo Group North America, Inc., 2008