ELECTRICAL

SECTION LAN LAN SYSTEM

B

E
CONTENTS
CAN FUNDAMENTAL Precaution for Trouble Diagnosis ............................37 F
Precaution for Harness Repair ................................37
SERVICE INFORMATION ............................ 2
TROUBLE DIAGNOSIS .................................... 39
G
PRECAUTIONS ................................................... 2 CAN Diagnostic Support Monitor .............................39
Precaution for Trouble Diagnosis .............................. 2 CAN System Specification Chart .............................41
Precaution for Harness Repair .................................. 2 CAN Communication Signal Chart ..........................41
Schematic ................................................................45 H
SYSTEM DESCRIPTION ..................................... 3 Wiring Diagram - CAN - ...........................................46
CAN Communication System .................................... 3 Interview Sheet ........................................................49
Diag on CAN ............................................................. 4 CAN System (Type 1) ..............................................50 I
CAN System (Type 2) ..............................................51
TROUBLE DIAGNOSIS ...................................... 6
CAN System (Type 3) ..............................................52
Condition of Error Detection ...................................... 6
CAN System (Type 4) ..............................................53 J
Symptom When Error Occurs in CAN Communi-
CAN System (Type 5) ..............................................54
cation System ............................................................ 6
CAN System (Type 6) ..............................................55
Self-Diagnosis ........................................................... 9
CAN System (Type 7) ..............................................56
CAN Diagnostic Support Monitor .............................. 9 LAN
CAN System (Type 8) ..............................................57
TROUBLE DIAGNOSES WORK FLOW ............12 CAN System (Type 9) ..............................................58
Information Needed for Trouble Diagnosis ............. 12 Component Parts Location ......................................58
How to Use CAN Communication Signal Chart ...... 12 Harness Layout .......................................................60 L
Trouble Diagnosis Flow Chart ................................. 13 Malfunction Area Chart ............................................60
Trouble Diagnosis Procedure .................................. 13 Main Line Between TCM and Data Link Connector
CAN ....61 M
Main Line Between Data Link Connector and ABS
SERVICE INFORMATION ........................... 35 Actuator and Electric Unit (Control Unit) ..................62
ECM Branch Line Circuit .........................................63
INDEX FOR DTC ................................................35 TCM Branch Line Circuit .........................................64 N
DTC No. Index ........................................................ 35 Transfer Control Unit Branch Line Circuit ................65
BCM Branch Line Circuit .........................................65
HOW TO USE THIS SECTION ...........................36 Data Link Connector Branch Line Circuit ................66 O
Caution .................................................................... 36 Combination Meter Branch Line Circuit ...................66
Abbreviation List ...................................................... 36 ABS Actuator and Electric Unit (Control Unit)
Branch Line Circuit ..................................................67 P
PRECAUTIONS ..................................................37
IPDM E/R Branch Line Circuit .................................67
Precaution for Supplemental Restraint System
CAN Communication Circuit ....................................68
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................. 37

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 PRECAUTIONS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]

SERVICE INFORMATION
PRECAUTIONS
Precaution for Trouble Diagnosis INFOID:0000000003034887

CAUTION:
• Never apply 7.0 V or more to the measurement terminal.
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness.
Precaution for Harness Repair INFOID:0000000003034888

• Solder the repaired area and wrap tape around the soldered area.
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).

SKIB8766E

• Bypass connection is never allowed at the repaired area.

NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost.

SKIB8767E

• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-
tion line.

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 SYSTEM DESCRIPTION
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
SYSTEM DESCRIPTION
A
CAN Communication System INFOID:0000000003034889

• CAN communication is a multiplex communication system. This enables the system to transmit and receive B
large quantities of data at high speed by connecting control units with two communication lines (CAN-H and
CAN-L).
• Control units on the CAN network transmit signals using the CAN communication control circuit. They
receive only necessary signals from other control units to operate various functions. C
• CAN communication lines adopt twisted-pair line style (two lines twisted) for noise immunity.
SYSTEM DIAGRAM
D

LAN
SKIB8887E

Each control unit passes an electric current to the termination circuits when transmitting CAN communication
signal. The termination circuits produce an electrical potential difference between CAN-H and CAN-L. CAN
L
communication system transmits and receives CAN communication signals by the potential difference.

Component Description
M
Main line CAN communication line between splices
Branch line CAN communication line between splice and a control unit
Splice A point connecting a branch line with a main line N
Termination circuit Refer to "CAN COMMUNICATION CONTROL CIRCUIT".

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 SYSTEM DESCRIPTION
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
CAN COMMUNICATION CONTROL CIRCUIT

SKIB8713E

Component System description

CAN controller It controls CAN communication signal transmission and reception, error detection, etc.
It converts digital signal into CAN communication signal, and CAN communication signal into digital
Transceiver IC
signal.
Noise filter It eliminates noise of CAN communication signal.

Termination circuit* It produces potential difference.

(Resistance of approx. 120 Ω)
*: These are the only control units wired with both ends of CAN communication system.

Diag on CAN INFOID:0000000003034890

DESCRIPTION
“Diag on CAN” is a diagnosis using CAN communication instead of previous DDL1 and DDL2 communication
lines, between control units and diagnosis unit.

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 SYSTEM DESCRIPTION
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
System Diagram
A

LAN
SKIB8714E

Name Harness Description

Tx
L
DDL1 It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
Rx
DDL2 K-LINE It is used for trouble diagnosis. (CAN-H and CAN-L are used for controlling)
M
CAN-H
Diag on CAN It is used for trouble diagnosis and control.
CAN-L

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Condition of Error Detection INFOID:0000000003034891

“U1000” or “U1001” is indicated on SELF-DIAG RESULTS on CONSULT-III if CAN communication signal is

not transmitted or received between units for 2 seconds or more.
CAN COMMUNICATION SYSTEM ERROR
• CAN communication line open (CAN-H, CAN-L, or both)
• CAN communication line short (ground, between CAN communication lines, other harnesses)
• Error of CAN communication control circuit of the unit connected to CAN communication line
WHEN “U1000” OR “U1001” IS INDICATED EVEN THOUGH CAN COMMUNICATION SYSTEM IS
NORMAL
• Removal/installation of parts: Error may be detected when removing and installing CAN communication unit
and related parts while turning the ignition switch ON. (A DTC except for CAN communication may be
detected.)
• Fuse blown out (removed): CAN communication of the unit may cease.
• Voltage drop: Error may be detected if voltage drops due to discharged battery when turning the ignition
switch ON (Depending on the control unit which carries out CAN communication).
• Error may be detected if the power supply circuit of the control unit, which carries out CAN communication,
malfunctions (Depending on the control unit which carries out CAN communication).
• Error may be detected if reprogramming is not completed normally.
NOTE:
CAN communication system is normal if “U1000” or “U1001” is indicated on SELF-DIAG RESULTS of CON-
SULT-III under the above conditions. Erase the memory of the self-diagnosis of each unit.
Symptom When Error Occurs in CAN Communication System INFOID:0000000003034892

In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:
• Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.
• Refer to LAN-36, "Abbreviation List" for the unit abbreviation.
Example: TCM branch line open circuit

SKIB8738E

Unit name Symptom

ECM Engine torque limiting is affected, and shift harshness increases.
BCM Reverse warning chime does not sound.

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Unit name Symptom
A
EPS control unit Normal operation.
• Shift position indicator and OD OFF indicator turn OFF.
Combination meter
• Warning lamps turn ON.
B
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R Normal operation. C
Example: Data link connector branch line open circuit

SKIB8739E

I
Unit name Symptom
ECM
BCM J
EPS control unit
Combination meter Normal operation.
LAN
ABS actuator and electric unit (control unit)
TCM
IPDM E/R L
NOTE:
• When data link connector branch line is open, transmission and reception of CAN communication signals
are not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit. M
• When data link connector branch line is open, “ECU list” displayed on the CONSULT-III “CAN DIAG SUP-
PORT MNTR” may be the same as when the CAN communication line has short-circuit. However, symp-
toms differ depending on the case. See below chart for the differences. N
“ECU list” on the “CAN DIAG
SUPPORT MNTR” Difference of symptom
(CONSULT-III) O
Data link connector branch line open circuit Normal operation.
All Diag on CAN units are not Most of the units which are connected to the CAN
CAN-H, CAN-L harness short-circuit indicated. communication system enter fail-safe mode or are P
deactivated.

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control Unit) Open Circuit

SKIB8740E

Unit name Symptom

ECM Engine torque limiting is affected, and shift harshness increases.
• Reverse warning chime does not sound.
BCM • The front wiper moves under continuous operation mode even though the front wip-
er switch being in the intermittent position.
EPS control unit The steering effort increases.
• The shift position indicator and OD OFF indicator turn OFF.
Combination meter • The speedometer is inoperative.
• The odo/trip meter stops.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
When the ignition switch is ON,
IPDM E/R • The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.

Example: CAN-H, CAN-L Harness Short Circuit

SKIB8741E

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]

Unit name Symptom A

• Engine torque limiting is affected, and shift harshness increases.
ECM
• Engine speed drops.
• Reverse warning chime does not sound. B
• The front wiper moves under continuous operation mode even though the front
wiper switch being in the intermittent position.
• The room lamp does not turn ON.
BCM C
• The engine does not start (if an error or malfunction occurs while turning the igni-
tion switch OFF.)
• The steering lock does not release (if an error or malfunction occurs while turning
the ignition switch OFF.)
D
EPS control unit The steering effort increases.
• The tachometer and the speedometer do not move.
Combination meter • Warning lamps turn ON. E
• Indicator lamps do not turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation. F
When the ignition switch is ON,
IPDM E/R • The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
G
Self-Diagnosis INFOID:0000000003034893

H
Self-diagnosis item
DTC DTC detection condition Inspection/Action
(CONSULT-III indication)
When ECM is not transmitting or receiving CAN I
communication signal of OBD (emission-related
diagnosis) for 2 seconds or more.
U1000 CAN COMM CIRCUIT
When a control unit (except for ECM) is not J
transmitting or receiving CAN communication Refer to LAN-12.
signal for 2 seconds or more.
When ECM is not transmitting or receiving CAN
U1001 CAN COMM CIRCUIT communication signal other than OBD (emis- LAN
sion-related diagnosis) for 2 seconds or more.
Start the inspection. Re-
When a control unit is not transmitting or receiv-
fer to the applicable sec- L
U1002 SYSTEM COMM ing CAN communication signal for 2 seconds or
tion of the indicated
less.
control unit.
When an error is detected during the initial diag- Replace the control unit M
U1010 CONTROL UNIT [CAN]
nosis for CAN controller of each control unit. indicating “U1010”.

CAN Diagnostic Support Monitor INFOID:0000000003034894

N
CONSULT-III and CAN diagnostic support monitor (on-board diagnosis function) are used for detecting root
cause.
MONITOR ITEM (CONSULT-III) O

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Example: CAN DIAG SUPPORT MNTR indication

PKID1075E

Without PAST

Item PRSNT Description

OK Normal at present
Initial diagnosis
NG Control unit error (Except for some control units)
OK Normal at present
Transmission diagnosis Unable to transmit signals for 2 seconds or more.
UNKWN
Diagnosis not performed
OK Normal at present

Control unit name Unable to receive signals for 2 seconds or more.

(Reception diagnosis) UNKWN Diagnosis not performed
No control unit for receiving signals. (No applicable optional parts)

With PAST

Item PRSNT PAST Description

OK Normal at present and in the past

OK Normal at present, but unable to transmit signals for 2 seconds or more

Transmission diagnosis 1 – 39 in the past. (The number indicates the number of ignition switch cycles
from OFF to ON.)
UNKWN 0 Unable to transmit signals for 2 seconds or more at present.
OK Normal at present and in the past

OK Normal at present, but unable to receive signals for 2 seconds or more

1 – 39 in the past. (The number indicates the number of ignition switch cycles
Control unit name from OFF to ON.)
(Reception diagnosis)
UNKWN 0 Unable to receive signals for 2 seconds or more at present.
Diagnosis not performed.
– –
No control unit for receiving signals. (No applicable optional parts)

MONITOR ITEM (ON-BOARD DIAGNOSIS)

NOTE:
For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-III is
not available.)

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Example: Vehicle Display
Result indi- A
Item Error counter Description
cated
OK 0 Normal at present
CAN_COMM Control unit error B
(Initial diagnosis) NG 1 – 50 (The number indicates how many times diagnosis has been
run.)
OK 0 Normal at present C
CAN_CIRC_1 Unable to transmit for 2 seconds or more at present.
(Transmission diagnosis) UNKWN 1 – 50 (The number indicates how many times diagnosis has been
run.)
D
OK 0 Normal at present
Unable to transmit for 2 seconds or more at present.
(The number indicates how many times diagnosis has been
CAN_CIRC_2 – 9 E
run.)
(Reception diagnosis of each unit) UNKWN 1 – 50
Diagnosis not performed.
No control unit for receiving signals. (No applicable optional F
parts)

LAN

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Information Needed for Trouble Diagnosis INFOID:0000000003034895

CAN communication system performs trouble diagnosis with the following tools.

Tool Usage
Interview sheet For filling in vehicle information and interview with customer.
Data sheet For copying on-board diagnosis data.
Diagnosis sheet For detecting the root cause. (Diagnosis sheet includes system diagram for every CAN system type)
ECU list
(On the “CAN DIAG SUPPORT
MNTR”)
SELF-DIAG RESULTS For checking the condition of control units and the status of CAN communication.
(CONSULT-III)
CAN DIAG SUPPORT MNTR
(CONSULT-III)
For converting information received from a customer into CAN communication signal transmission
CAN communication signal
and reception. This information can be used to judge whether a circuit between control units is nor-
chart
mal or abnormal.
Abbreviation list For checking abbreviations in CAN communication signal chart and diagnosis sheet.

How to Use CAN Communication Signal Chart INFOID:0000000003034896

The CAN communication signal chart lists the signals needed for trouble diagnosis. It is useful for detecting
the root cause by finding a signal related to the symptom, and by checking transmission and reception unit.

SKIB8715E

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Trouble Diagnosis Flow Chart INFOID:0000000003034897

LAN

N
PKID1210E

O
Trouble Diagnosis Procedure INFOID:0000000003034898

INTERVIEW WITH CUSTOMER

P
Interview with the customer is important to detect the root cause of CAN communication system errors and to
understand vehicle condition and symptoms for proper trouble diagnosis.
Points in interview
• What: Parts name, system name
• When: Date, Frequency
• Where: Road condition, Place
• In what condition: Driving condition/environment

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
• Result: Symptom
NOTE:
• Check normal units as well as error symptoms.
- Example: Circuit between ECM and the combination meter is judged normal if the customer indicates
tachometer functions normally.
• When a CAN communication system error is present, multiple control units may malfunction or go into fail-
safe mode.
• Indication of the combination meter is important to detect the root cause because it is the most obvious to
the customer, and it performs CAN communication with many units.

SKIB8717E

INSPECTION OF VEHICLE CONDITION

• Check whether or not “U1000” or “U1001” is indicated on “SELF-DIAG RESULTS” by CONSULT-III.
NOTE:
Root cause cannot be detected using the procedure in this section if “U1000” or “U1001” is not indicated.
• Check whether the symptom is reproduced or not.
NOTE:
• Do not turn the ignition switch OFF or disconnect the battery cable while reproducing the error. The error
may temporarily correct itself, making it difficult to determine the root cause.
• The procedures for present errors differ from the procedures for past errors. Refer to "DETECT THE
ROOT CAUSE".
CHECK OF CAN SYSTEM TYPE (HOW TO USE CAN SYSTEM TYPE SPECIFICATION CHART)
Determine CAN system type based on vehicle equipment. Then choose the correct diagnosis sheet.
NOTE:
There are two styles for CAN system type specification charts. Depending on the number of available system
types, either style A or style B may be used.
CAN System Type Specification Chart (Style A)
NOTE:

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.
A

LAN

L
SKIB8888E

CAN System Type Specification Chart (Style B) M

NOTE:

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
CAN system type is easily checked with the vehicle equipment identification information shown in the chart.

SKIB8889E

CREATE INTERVIEW SHEET

Fill out the symptom described by the customer, vehicle condition, and CAN system type on the interview
sheet.

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Interview Sheet (Example)
A

LAN

L
PKID1211E

COLLECT DATA M

Collect CONSULT-III Data

Print out or save the following CONSULT-III data.
N
• SELF-DIAG RESULTS
• CAN DIAG SUPPORT MNTR (“ECU list” included)
NOTE:
O

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Some items may not be needed depending on CAN system type of vehicle.

PKID1212E

Create On-board Diagnosis Copy Sheet

Display the trouble diagnosis result of CAN communication with the on-board diagnosis function on the vehicle
monitor, etc. Copy them on the on-board diagnosis copy sheet.
NOTE:

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
For some models, CAN communication diagnosis result is received from the vehicle monitor. (CONSULT-III is
not available.) A

LAN
SKIB8722E

CREATE DIAGNOSIS SHEET L

NOTE:
Be sure to use the diagnosis sheet for the correct CAN system type.
Print Diagnosis Sheet M
Print the diagnosis sheet for the applicable CAN system type.
Check Collected Data
Make sure that all ECUs are received, referring to “ECU list”. N

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
• For abbreviations, refer to LAN-36, "Abbreviation List".

PKID1213E

DETECT THE ROOT CAUSE

Identify the root cause using the created diagnosis sheet.
Identifying the root cause
• Draw a line on the diagnosis sheet to indicate the possible cause. Narrow the search.
NOTE:
• Color-code when drawing lines.
• Do not draw a line onto a existing line.
• Drawing a line is not necessary if the circuit is shorted. Refer to "Present Error — Short Circuit —", "Past
Error — Short Circuit —".
Refer to the following for details of the trouble diagnosis procedure.
• "Present Error — Open Circuit —"
• "Present Error — Short Circuit —"
• "Past Error — Open Circuit —"
• "Past Error — Short Circuit —"
NOTE:
When the root cause appears to be a branch line or short circuit, be sure to check the control unit as well as
the communication line.
Present Error — Open Circuit —

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Identify the error circuit using information from the “CAN DIAG SUPPORT MNTR” (“ECU list” included).
1. ECU list: Check the items indicated in “ECU list”. Draw a line on the diagnosis sheet to indicate the error A
circuit.
NOTE:
CAN communication line has no error if units other than Diag on CAN units are not indicated. An error B
may be on the power supply of the control unit, DDL1 line or DDL2 line.
a. “TCM” which is Diag on CAN unit, is not indicated on “ECU list”. This indicates that DLC is not receiving a
signal from TCM. Draw a line to indicate an error between DLC and TCM (line 1-a in the figure below).
C
NOTE:
• Diag on CAN units are not indicated on the “ECU list” when the CAN line between Diag on CAN unit and
the data link connector is open.
• For a description of Diag on CAN, refer to LAN-4, "Diag on CAN". D

LAN

N
PKID1214E

2. CAN DIAG SUPPORT MNTR: Check each item on “CAN DIAG SUPPORT MNTR”. Draw a line on the
diagnosis sheet to indicate the error circuit. O
a. Reception item of “ECM”: On “TCM”, “UNKWN” is indicated. This means ECM cannot receive the signal
from TCM. Draw a line to indicate an error between ECM and TCM (line 2-a in the figure below).
NOTE: P
If “UNKWN” is indicated on “TRANSMIT DIAG”, then the control unit cannot transmit CAN communication
signal to each unit. Draw a line between the control unit and the splice.
b. Reception item of “AFS”: On “TCM”, “UNKWN” is indicated. This means AFS cannot receive the signal
from TCM. Draw a line to indicate an error between AFS and TCM (line 2-b in the figure below).

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
c. Reception item of “AV”: “UNKWN” is not indicated. This indicates normal communication between AV and
its receiving units. Do not draw any line.

PKID1215E

d. Reception item of “BCM”: On “TCM”, “UNKWN” is indicated. This means BCM cannot receive the signal
from TCM. Draw a line to indicate an error between BCM and TCM (line 2-d in the figure below).
e. Reception item of “EPS” and “I-KEY”: “UNKWN” is not indicated. This indicates normal communication
between EPS and I-KEY and their receiving units. Do not draw any line.
NOTE:

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
On CAN DIAG SUPPORT MNTR (without PAST), “UNKWN” is indicated even though the item is not used
in the trouble diagnosis. For the details of each item on CAN diagnostic support monitor, refer to LAN-39, A
"CAN Diagnostic Support Monitor".

LAN

PKID1216E

f. Reception item of “M&A”: On “TCM”, “UNKWN” is indicated. This means M&A cannot receive the signal L
from TCM. Draw a line to indicate an error between M&A and TCM (line 2-f in the figure below).
g. Reception item of “ADP”: On “TCM”, “UNKWN” is indicated. This means ADP cannot receive the signal
from TCM. Draw a line to indicate an error between ADP and TCM (line 2-g in the figure below). M

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
h. Reception item of “ABS”: “UNKWN” is not indicated. This indicates normal communication between ABS
and its receiving units. Do not draw any line.

PKID1217E

i. Reception item of “IPDM-E”: “UNKWN” is not indicated. This indicates normal communication between
IPDM-E and its receiving units. Do not draw any line.
3. Based on information received from “CAN DIAG SUPPORT MNTR”, place a check mark on the known
good CAN communication line between ECM and IPDM-E.
a. Through the previous procedure, the circuit between ADP splice and TCM has the most amount of lines
(shade 3-a in the figure below).
b. Place a check mark on the known good lines to establish the error circuit.

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
Reception item of “IPDM-E”: On “ECM”, “OK” is indicated. IPDM-E communicates normally with ECM. Put
a check mark on the normal circuit between ECM and IPDM-E (check mark 3-b in the figure below). A

LAN
PKID1218E

4. Through the above procedure, the error is detected in the TCM branch line (shaded in the figure below).
NOTE: L
For abbreviations, refer to LAN-36, "Abbreviation List".

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
5. Perform the inspection for the detected error circuit. For the inspection procedure, refer to LAN-60, "Mal-
function Area Chart".

PKID1219E

Present Error — Short Circuit —

When the symptoms listed below exist, a short circuit of the CAN communication line is a possible cause.
Received data

Item (CONSULT-III) Indication

ECU list (on the CAN DIAG SUPPORT MNTR) All Diag on CAN units are not indicated.
CAN DIAG SUPPORT MNTR “UNKWN” is indicated under “TRANSMIT DIAG” and most reception items.

Error symptom
• Most the units connected to the CAN communication system go into fail-safe mode or are deactivated.
Inspection procedure

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
• Refer to LAN-60, "Malfunction Area Chart".
A

PKID1220E
LAN

Past Error — Open Circuit —

Review CAN communication signal chart based on information received from the interview with the customer L
and on past error information from SELF-DIAG RESULTS and CAN DIAG SUPPORT MNTR.

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
1. SELF-DIAG RESULTS: Inspect the control units indicating “U1000” or “U1001” on SELF-DIAG RESULTS.

PKID1221E

2. CAN DIAG SUPPORT MNTR (with PAST): Check the CAN DIAG SUPPORT MNTR (with PAST) of units
indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indicate
the possible error circuit.
NOTE:
For the details of each indication on CAN DIAG SUPPORT MNTR, refer to LAN-39, "CAN Diagnostic Sup-
port Monitor".
a. Reception item of “ECM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means ECM could not
receive the signal from ABS in the past. Draw a line between ECM and ABS (line 2-a in the figure below).
b. Reception item of “M&A”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means M&A could not
receive the signal from ABS in the past. Draw a line between M&A and ABS (line 2-b in the figure below).

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 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
c. Reception item of “TCM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means TCM could not
receive the signal from ABS in the past. Draw a line between TCM and ABS (line 2-c in the figure below). A

LAN
PKID1222E

3. CAN DIAG SUPPORT MNTR (without PAST): Check the CAN DIAG SUPPORT MNTR (without PAST) of
units indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indi- L
cate the possible error circuit.
NOTE:
• While an error occurred in the past according to SELF-DIAG RESULTS, it is unclear which signal is not M
received. Assume that errors were detected from all reception items.
• Draw a single line among the unit and all reception items. (Work flow differs from CAN DIAG SUPPORT
MNTR (with PAST).)
N
a. Reception item of “EPS”: Assume that the unit could not receive the signals from ECM, ABS, and M&A.
Draw a line among EPS, ECM, ABS, and M&A (line 3-a in the figure below).

Revision: 2009 March LAN-29 D40

 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
b. Reception item of “ABS”: Assume that the unit could not receive the signal from ECM. Draw a line
between ABS and ECM (line 3-b in the figure below).

PKID1223E

4. Search for the possible cause using CAN communication signal chart using information from the interview
with the customer.
NOTE:
For the details of CAN communication signal, refer to LAN-41, "CAN Communication Signal Chart".
a. ABS warning lamp turned ON and speedometer did not move: This means that “ABS warning lamp signal”
and “Vehicle speed signal” could not communicate between M&A and ABS (4-a in the figure below).

Revision: 2009 March LAN-30 D40

 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
b. The tachometer moved normally: This means that “Engine speed signal” could communicate normally
between ECM and M&A (4-b in the figure below). A

LAN

SKIB8895E

5. Fill out the diagnosis sheet based on information from step 4. M

a. The ABS warning lamp turned ON and speedometer did not move: Assume that a possible cause is no
communication between M&A and ABS. Draw a line between M&A and ABS. (Line 5-a in the figure
below). N

Revision: 2009 March LAN-31 D40

 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
b. The tachometer moved normally: Put check marks between ECM and M&A. The circuit between ECM and
M&A is functioning properly (check marks 5-b in the figure below).

SKIB8735E

6. The circuit which has the most amount of lines are the possible cause. Error is detected from ABS actua-
tor and electric unit (control unit) branch line (shaded in the figure below).
NOTE:
For abbreviations, refer to LAN-36, "Abbreviation List".

Revision: 2009 March LAN-32 D40

 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
7. Perform the inspection procedure for the possible cause. Refer to LAN-60, "Malfunction Area Chart".
A

LAN

L
PKID1224E

Past Error — Short Circuit — M

When the symptoms listed below exist, a short circuit of the CAN communication line is a possible cause.

Item (CONSULT-III) Indication Inspection procedure N

SELF-DIAG RESULTS “U1000” and “U1001” is indicated in the past for most units.
Refer to LAN-60, "Malfunction
Only on CAN DIAG SUPPORT MNTR (with PAST), “1 - 39” is in- Area Chart".
CAN DIAG SUPPORT MNTR
dicated on “PAST” of “TRANSMIT DIAG” and the reception item. O

Revision: 2009 March LAN-33 D40

 TROUBLE DIAGNOSES WORK FLOW
< SERVICE INFORMATION > [CAN FUNDAMENTAL]

PKID1225E

Revision: 2009 March LAN-34 D40

 INDEX FOR DTC
< SERVICE INFORMATION > [CAN]

SERVICE INFORMATION A
INDEX FOR DTC
DTC No. Index INFOID:0000000003034899
B

Self-diagnosis item
DTC DTC detection condition Inspection C
(CONSULT-III indication)
When ECM is not transmitting or receiving CAN
communication signal of OBD (emission-related
diagnosis) for 2 seconds or more. D
U1000 CAN COMM CIRCUIT
When a control unit (except for ECM) is not
transmitting or receiving CAN communication Refer to LAN-36.
signal for 2 seconds or more. E
When ECM is not transmitting or receiving CAN
U1001 CAN COMM CIRCUIT communication signal other than OBD (emis-
sion-related diagnosis) for 2 seconds or more.
F
Start the inspection. Re-
When a control unit is not transmitting or receiv-
fer to the applicable sec-
U1002 SYSTEM COMM ing CAN communication signal for 2 seconds or
tion of the indicated
less.
control unit. G
When an error is detected during the initial diag- Replace the control unit
U1010 CONTROL UNIT [CAN]
nosis for CAN controller of each control unit. indicating “U1010”.
H

LAN

Revision: 2009 March LAN-35 D40

 HOW TO USE THIS SECTION
< SERVICE INFORMATION > [CAN]
HOW TO USE THIS SECTION
Caution INFOID:0000000003034900

• This section describes information peculiar to a vehicle, sheets for trouble diagnosis, and inspection proce-
dures.
• For trouble diagnosis procedure, refer to LAN-13, "Trouble Diagnosis Procedure".
Abbreviation List INFOID:0000000003034901

Abbreviations in CAN communication signal chart, and the diagnosis sheet are as per the following list.

SELECT SYSTEM CAN DIAG SUPPORT MNTR

Abbreviation Unit name
(CONSULT-III) (CONSULT-III)
4WD Transfer control unit ALL MODE AWD/4WD AWD/4WD
ABS ABS actuator and electric unit (control unit) ABS VDC/TCS/ABS
BCM BCM BCM BCM/SEC
DLC Data link connector — —
ECM ECM ENGINE ECM
IPDM-E IPDM E/R IPDM E/R IPDM E/R
M&A Combination meter METER/M&A METER/M&A
TCM TCM TRANSMISSION TCM

Revision: 2009 March LAN-36 D40

 PRECAUTIONS
< SERVICE INFORMATION > [CAN]
PRECAUTIONS
A
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER" INFOID:0000000003034902

B
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the “SUPPLEMENTAL C
RESTRAINT SYSTEM” and “SEAT BELTS” of this Service Manual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by D
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag E
Module, see the “SUPPLEMENTAL RESTRAINT SYSTEM”.
• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
F
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING: G
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s)
with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly H
causing serious injury.
• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the
battery, and wait at least 3 minutes before performing any service.
I
Precaution for Trouble Diagnosis INFOID:0000000003034903

CAUTION:
• Never apply 7.0 V or more to the measurement terminal. J
• Use a tester with open terminal voltage of 7.0 V or less.
• Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when
checking the harness. LAN
Precaution for Harness Repair INFOID:0000000003034904

• Solder the repaired area and wrap tape around the soldered area. L
NOTE:
A fray of twisted lines must be within 110 mm (4.33 in).
M

SKIB8766E O

Revision: 2009 March LAN-37 D40

 PRECAUTIONS
< SERVICE INFORMATION > [CAN]
• Bypass connection is never allowed at the repaired area.
NOTE:
Bypass connection may cause CAN communication error. The
spliced wire becomes separated and the characteristics of twisted
line are lost.

SKIB8767E

• Replace the applicable harness as an assembly if error is detected on the shield lines of CAN communica-
tion line.

Revision: 2009 March LAN-38 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
TROUBLE DIAGNOSIS
A
CAN Diagnostic Support Monitor INFOID:0000000003034905

Use “CAN DIAG SUPPORT MNTR” for detecting the root cause. B
MONITOR ITEM LIST (CONSULT-III)
ECM (QR25DE Models)
C
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
CAN DIAG SUP- Normal Error
ITEM Description
PORT MNTR PRSNT PAST PRSNT PAST
D
OK
TRANSMIT DIAG Signal transmission status OK or UNKWN 0
1 – 39*
E
VDC/TCS/ABS Not used even though indicated
Signal receiving status from the combina- OK
METER/M&A
tion meter OK or UNKWN 0 F
BCM/SEC Signal receiving status from the BCM 1 – 39*
ICC
Not used even though indicated
HVAC G
ECM
OK
TCM Signal receiving status from the TCM OK or UNKWN 0
1 – 39* H
EPS Not used even though indicated
OK
IPDM E/R Signal receiving status from the IPDM E/R OK or UNKWN 0 I
*
1 – 39
e4WD
Not used even though indicated J
AWD/4WD

*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.

ECM (YD25DDTi Models) LAN

NOTE:
Replace the unit when “NG” is indicated on the “INITIAL DIAG”.
L
CAN DIAG SUP- Normal Error
ITEM Description
PORT MNTR PRSNT
INITIAL DIAG Status of CAN controller NG M
TRANSMIT DIAG Signal transmission status
TCM Signal receiving status from the TCM
N
ECM Signal receiving status from the ABS actuator and electric unit OK
VDC/TCS/ABS UNKWN
(control unit)
METER/M&A Signal receiving status from the combination meter O
BCM/SEC Signal receiving status from the BCM

TCM
NOTE: P
Replace the unit when “NG” is indicated on the “INITIAL DIAG”.

Revision: 2009 March LAN-39 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

CAN DIAG SUP- Normal Error

ITEM Description
PORT MNTR PRSNT
INITIAL DIAG Status of CAN controller NG
TRANSMIT DIAG Signal transmission status
ECM Signal receiving status from the ECM
OK
Signal receiving status from the ABS actuator and electric unit UNKWN
TCM VDC/TCS/ABS
(control unit)
METER/M&A Signal receiving status from the combination meter
ICC/e4WD Not used even though indicated
AWD/4WD Signal receiving status from the transfer control unit OK UNKWN

Transfer Control Unit

NOTE:
Replace the unit when “NG” is indicated on the “INITIAL DIAG”.

CAN DIAG SUP- Normal Error

ITEM Description
PORT MNTR PRSNT
INITIAL DIAG Status of CAN controller NG
TRANSMIT DIAG Signal transmission status
ECM Signal receiving status from the ECM
4WD OK
Signal receiving status from the ABS actuator and electric unit UNKWN
VDC/TCS/ABS
(control unit)
TCM Signal receiving status from the TCM

BCM
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON)
CAN DIAG SUP- Normal Error
ITEM Description
PORT MNTR PRSNT PAST PRSNT PAST
TRANSMIT DIAG Signal transmission status
OK
ECM Signal receiving status from the ECM or
OK UNKWN 0
METER/M&A
Signal receiving status from the combina- 1 – 39*
tion meter
TCM
BCM Not used even though indicated
MULTI AV
OK
IPDM E/R Signal receiving status from the IPDM E/R OK or UNKWN 0
1 – 39*
I-KEY Not used even though indicated

*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.

ABS Actuator and Electric Unit (Control Unit)

CAN DIAG SUP- Normal Error

ITEM Description
PORT MNTR PRSNT
INITIAL DIAG Status of CAN controller NGCaution
ABS TRANSMIT DIAG Signal transmission status OK
UNKWN
ECM Signal receiving status from the ECM
CAUTION:
Never replace the unit even when “NG” is indicated on the “INITIAL DIAG” at this stage. Follow the trouble diagnosis proce-
dures.

Revision: 2009 March LAN-40 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
IPDM E/R
0: Error at present, 1 – 39: Error in the past (Number means the number of times the ignition switch is turned OFF→ON) A
CAN DIAG SUP- Normal Error
ITEM Description
PORT MNTR PRSNT PAST PRSNT PAST
TRANSMIT DIAG Signal transmission status
B
OK
IPDM-E ECM Signal receiving status from the ECM OK or UNKWN 0
BCM/SEC Signal receiving status from the BCM 1 – 39*
C
*: 39 or higher number is fixed at 39 until the self-diagnosis result is erased.

CAN System Specification Chart INFOID:0000000003035228

D
Determine CAN system type from the following specification chart. Then choose the correct diagnosis sheet.
NOTE:
Refer to LAN-13, "Trouble Diagnosis Procedure" for how to use CAN system specification chart. E

Body type Truck

Axle 2WD 4WD F
Engine QR25DE YD25DDTi
Transmission M/T A/T M/T A/T M/T A/T
G
Brake control — ABS — ABS — ABS
CAN system type 1 2 3 4 5 6 7 8 9
Diagnosis sheet LAN-50 LAN-51 LAN-52 LAN-53 LAN-54 LAN-55 LAN-56 LAN-57 LAN-58 H
CAN communication signal chart “TYPE 1/TYPE 2/TYPE 3” “TYPE 4/TYPE 5/TYPE 6/TYPE 7/TYPE 8/TYPE 9”

VEHICLE EQUIPMENT IDENTIFICATION INFORMATION I

NOTE:
Check CAN system type from the vehicle shape and equipment.
J

LAN

L
JPMIA1032GB

CAN Communication Signal Chart INFOID:0000000003035006 M

Refer to LAN-12, "How to Use CAN Communication Signal Chart" for how to use CAN communication signal
chart.
N
TYPE 1/TYPE 2/TYPE 3
NOTE:
Refer to LAN-36, "Abbreviation List" for the abbreviations of the connecting units. O
T: Transmit R: Receive
IPDM-E
TCM*1

ABS*2
ECM

BCM

M&A

Signal name/Connecting unit P

A/C compressor request signal T R

Accelerator pedal position signal T R
ASCD CRUISE lamp signal T R
ASCD OD cancel request T R
ASCD operation signal T R

Revision: 2009 March LAN-41 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

IPDM-E
TCM*1

ABS*2
ECM

BCM

M&A
Signal name/Connecting unit

ASCD SET lamp signal T R

Battery voltage signal T R
Closed throttle position signal T R
Cooling fan speed request signal T R
Engine coolant temperature signal T R
Engine speed signal T R R
Engine status signal T R
Fuel consumption monitor signal T R
Malfunction indicator lamp signal T R
Power generation command value signal T R
Wide open throttle position signal T R
A/T fluid temperature sensor signal T R
A/T self-diagnosis signal R T
OD OFF indicator lamp signal T R
Output shaft revolution signal R T
Shift position signal T R
Turbine revolution signal R T
A/C switch signal R T
Blower fan motor switch signal R T
Buzzer output signal T R
Door switch signal T R R
Front fog light request signal T R R
Front wiper request signal T R
High beam request signal T R R
Horn chirp signal T R
Ignition switch ON request signal T R
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R
Sleep wake up signal T R R
Theft warning horn request signal T R
Turn indicator signal T R
1st position switch signal R T
Fuel level sensor signal R T
Overdrive control switch signal R T
Stop lamp switch signal R T
R R R T
Vehicle speed signal
R T
A/T shift schedule change demand signal R T
ABS operation signal R T
ABS warning lamp signal R T
Front wiper stop position signal R T
High beam status signal R T

Revision: 2009 March LAN-42 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

IPDM-E
TCM*1

ABS*2
ECM

BCM

M&A
Signal name/Connecting unit A

Hood switch signal R T

B
Low beam status signal R T
Oil pressure switch signal R T
Rear window defogger control signal R T C
*1: A/T models
*2: Models with ABS

TYPE 4/TYPE 5/TYPE 6/TYPE 7/TYPE 8/TYPE 9 D

NOTE:
Refer to LAN-36, "Abbreviation List" for the abbreviations of the connecting units.
T: Transmit R: Receive E

IPDM-E
4WD*2
TCM*1

*3
ECM

BCM

M&A

ABS
Signal name/Connecting unit
F
A/C compressor request signal T R
Accelerator pedal position signal T R
G
ASCD CRUISE lamp signal T R
ASCD SET lamp signal T R
Battery voltage signal T R H
Closed throttle position signal T R
Cooling fan speed request signal T R
I
DPF (Diesel Particulate Filter) warning lamp signal T R
Engine coolant temperature signal T R
Engine speed signal T R R R J
Engine status signal T R
Glow indicator signal T R
Malfunction indicator lamp signal T R LAN
Wide open throttle position signal T R
A/T fluid temperature sensor signal T R
L
A/T self-diagnosis signal R T
OD OFF indicator lamp signal T R
Output shaft revolution signal R T R M
Shift position signal R T R R
Turbine revolution signal R T
N
A/C switch signal R T
Buzzer output signal T R
Door switch signal T R R O
Front fog light request signal T R R
Front wiper request signal T R
P
High beam request signal T R R
Horn chirp signal T R
Ignition switch ON request signal T R
Low beam request signal T R
Position light request signal T R R
Rear window defogger switch signal T R

Revision: 2009 March LAN-43 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

IPDM-E
4WD*2
TCM*1

ABS*3
ECM

BCM

M&A
Signal name/Connecting unit

Sleep wake up signal T R R

Theft warning horn request signal T R
Turn indicator signal T R
1st position switch signal R T
Overdrive control switch signal R T
Stop lamp switch signal R T
R R R*4 R T
Vehicle speed signal
R R*3 R T
A/T shift schedule change demand signal R T
ABS operation signal R T
ABS warning lamp signal R T
Stop lamp switch signal R T
Front wiper stop position signal R T
Hood switch signal R T
Oil pressure switch signal R T
*1: A/T models
*2: 4WD models
*3: Models with ABS
*4: Models without ABS

Revision: 2009 March LAN-44 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
Schematic INFOID:0000000003034908

LAN

PKWD1649E
P

Revision: 2009 March LAN-45 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
Wiring Diagram - CAN - INFOID:0000000003034909

TKWB5037E

Revision: 2009 March LAN-46 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

LAN

TKWB4594E

Revision: 2009 March LAN-47 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

PKWD1665E

Revision: 2009 March LAN-48 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
Interview Sheet INFOID:0000000003034912

LAN

SKIB8898E

Revision: 2009 March LAN-49 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 1) INFOID:0000000003034913

DIAGNOSIS SHEET

JPMIA0776GB

Revision: 2009 March LAN-50 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 2) INFOID:0000000003034914

A
DIAGNOSIS SHEET

LAN

P
JPMIA0777GB

Revision: 2009 March LAN-51 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 3) INFOID:0000000003034915

DIAGNOSIS SHEET

JPMIA0778GB

Revision: 2009 March LAN-52 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 4) INFOID:0000000003034916

A
DIAGNOSIS SHEET

LAN

P
JPMIA0776GB

Revision: 2009 March LAN-53 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 5) INFOID:0000000003034917

DIAGNOSIS SHEET

JPMIA0777GB

Revision: 2009 March LAN-54 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 6) INFOID:0000000003034918

A
DIAGNOSIS SHEET

LAN

P
JPMIA0778GB

Revision: 2009 March LAN-55 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 7) INFOID:0000000003034919

DIAGNOSIS SHEET

JPMIA0779GB

Revision: 2009 March LAN-56 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 8) INFOID:0000000003034920

A
DIAGNOSIS SHEET

LAN

P
JPMIA0780GB

Revision: 2009 March LAN-57 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
CAN System (Type 9) INFOID:0000000003034921

DIAGNOSIS SHEET

JPMIA0781GB

Component Parts Location INFOID:0000000003034941

LHD MODELS

Revision: 2009 March LAN-58 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

H
PKID0772E

1. IPDM E/R E17 2. ECM E20 3. Not applicable

4. BCM M42 5. Transfer control unit M105 6. Combination meter M23 I
7. ABS actuator and electric unit (con- 8. Not applicable 9. Data link connector M45
trol unit) E63
10. Not applicable 11. A/T assembly F36 J

RHD MODELS
LAN

Revision: 2009 March LAN-59 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

PKID0775E

1. ECM E20 2. Transfer control unit M105 3. BCM M42

4. ABS actuator and electric unit (con- 5. IPDM E/R E17 6. Data link connector M45
trol unit) E63
7. A/T assembly F36 8. Not applicable 9. Combination meter M23

Harness Layout INFOID:0000000003034942

Refer to PG-24, "Harness Layout".

Malfunction Area Chart INFOID:0000000003034943

MAIN LINE

Malfunction Area Reference

Main line between TCM and data link connector LAN-61, "Main Line Between TCM and Data Link Connector"
Main line between data link connector and ABS actuator and LAN-62, "Main Line Between Data Link Connector and ABS Ac-
electric unit (control unit) tuator and Electric Unit (Control Unit)"

BRANCH LINE

Malfunction Area Reference

ECM branch line circuit LAN-63, "ECM Branch Line Circuit"
TCM branch line circuit LAN-64, "TCM Branch Line Circuit"
Transfer control unit branch line circuit LAN-65, "Transfer Control Unit Branch Line Circuit"
BCM branch line circuit LAN-65, "BCM Branch Line Circuit"
Data link connector branch line circuit LAN-66, "Data Link Connector Branch Line Circuit"
Combination meter branch line circuit LAN-66, "Combination Meter Branch Line Circuit"
LAN-67, "ABS Actuator and Electric Unit (Control Unit) Branch
ABS actuator and electric unit (control unit) branch line circuit
Line Circuit"
IPDM E/R branch line circuit LAN-67, "IPDM E/R Branch Line Circuit"

Revision: 2009 March LAN-60 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
SHORT CIRCUIT
A
Malfunction Area Reference
CAN communication circuit LAN-68, "CAN Communication Circuit"
B
Main Line Between TCM and Data Link Connector INFOID:0000000003034944

INSPECTION PROCEDURE C
1.CHECK CONNECTOR
1. Turn the ignition switch OFF. D
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (connector side
and harness side).
- Models with DPF (Diesel Particulate Filter) E
• Harness connector F10
• Harness connector E25
• Harness connector E122 F
• Harness connector M90
- Models without DPF
• Harness connector F2
• Harness connector E8 G
• Harness connector E122
• Harness connector M90
OK or NG H
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT) I

1. Disconnect the following harness connectors.

- Models with DPF
• A/T assembly J
• Harness connectors F10 and E25
- Models without DPF
• A/T assembly LAN
• Harness connectors F2 and E8
2. Check the continuity between the A/T assembly harness connector and the harness connector.
- Models with DPF
L
A/T assembly harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
M
3 5 Yes
F36 F10
8 21 Yes
- Models without DPF N

A/T assembly harness connector Harness connector

Continuity
Connector No. Terminal No. Connector No. Terminal No. O
3 1 Yes
F36 F2
8 13 Yes
P
OK or NG
OK >> GO TO 3.
NG (Models with DPF)>>Repair the main line between the A/T assembly and the harness connector F10.
NG (Models without DPF)>>Repair the main line between the A/T assembly and the harness connector F2.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the harness connectors E122 and M90.

Revision: 2009 March LAN-61 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
2. Check the continuity between harness connectors.
- Models with DPF

Harness connector Harness connector

Continuity
Connector No. Terminal No. Connector No. Terminal No.
5 1 Yes
E25 E122
21 13 Yes
- Models without DPF

Harness connector Harness connector

Continuity
Connector No. Terminal No. Connector No. Terminal No.
1 1 Yes
E8 E122
13 13 Yes
OK or NG
OK >> GO TO 4.
NG (Models with DPF)>>Repair the main line between the harness connectors E25 and E122.
NG (Models without DPF)>>Repair the main line between the harness connectors E8 and E122.
4.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
Check the continuity between the harness connector and the data link connector.

Harness connector Data link connector

Continuity
Connector No. Terminal No. Connector No. Terminal No.
1 6 Yes
M90 M45
13 14 Yes
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU
list” included)].
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the A/T assembly and the data link con-
nector.
NG >> Repair the main line between the harness connector M90 and the data link connector.
Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Control
Unit) INFOID:0000000003034949

INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (connector side
and harness side).
- Harness connector M90
- Harness connector E122
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the harness connectors M90 and E122.
2. Check the continuity between the data link connector and the harness connector.

Revision: 2009 March LAN-62 D40

 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

Data link connector Harness connector A

Continuity
Connector No. Terminal No. Connector No. Terminal No.
6 2 Yes
M45 M90 B
14 14 Yes
OK or NG
OK >> GO TO 3. C
NG >> Repair the main line between the data link connector and the harness connector M90.
3.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect the connector of ABS actuator and electric unit (control unit). D
2. Check the continuity between the harness connector and the ABS actuator and electric unit (control unit)
harness connector.
E
ABS actuator and electric unit (control unit)
Harness connector
harness connector Continuity
Connector No. Terminal No. Connector No. Terminal No. F
2 11 Yes
E122 E63
14 15 Yes
OK or NG G
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU H
list” included)].
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the data link connector and the ABS I
actuator and electric unit (control unit).
NG >> Repair the main line between the harness connector E122 and the ABS actuator and electric unit
(control unit).
J
ECM Branch Line Circuit INFOID:0000000003034952

INSPECTION PROCEDURE LAN

1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
L
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).
- M/T models M
• ECM
• Harness connector E122
• Harness connector M90
N
- A/T models with DPF (Diesel Particulate Filter)
• ECM
• Harness connector E25
• Harness connector F10 O
- A/T models without DPF
• ECM
• Harness connector E8 P
• Harness connector F2
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of ECM.

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
2. Check the resistance between the ECM harness connector terminals
- QR25DE models

ECM harness connector

Resistance (Ω)
Connector No. Terminal No.
E20 94 86 Approx. 108 – 132
- YD25DDTi models

ECM harness connector

Resistance (Ω)
Connector No. Terminal No.
E20 95 87 Approx. 108 – 132
OK or NG
OK >> GO TO 3.
NG >> Repair the ECM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ECM. Refer to the following.
NOTE:
Check the OBD discrimination of the vehicle. Refer to EC-191, "How to Check Vehicle Type".
• QR: EC-83, "Diagnosis Procedure"
• YD TYPE 1: EC-244, "Diagnosis Procedure"
• YD TYPE 2: EC-424, "Diagnosis Procedure"
OK or NG
OK >> • Present error: Replace the ECM. Refer to the following.
NOTE:
Check the OBD discrimination of the vehicle. Refer to EC-191, "How to Check Vehicle Type".
- QR: EC-33, "Procedure After Replacing ECM"
- YD TYPE 1: EC-204, "Procedure After Replacing ECM"
- YD TYPE 2: EC-371, "Procedure After Replacing ECM"
• Past error: Error was detected in the ECM branch line.
NG >> Repair the power supply and the ground circuit.
TCM Branch Line Circuit INFOID:0000000003034954

INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the A/T assembly for damage, bend and loose connection (unit
side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of A/T assembly.
2. Check the resistance between the A/T assembly harness connector terminals.

A/T assembly harness connector

Resistance (Ω)
Connector No. Terminal No.
F36 3 8 Approx. 54 – 66
OK or NG
OK >> GO TO 3.
NG >> Repair the TCM branch line.

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

3.CHECK POWER SUPPLY AND GROUND CIRCUIT A

Check the power supply and the ground circuit of the TCM. Refer to AT-117, "Wiring Diagram - AT - MAIN".
OK or NG
OK >> • Present error: Replace the control valve with TCM. Refer to AT-160, "Control Valve with TCM B
and A/T Fluid Temperature Sensor 2".
• Past error: Error was detected in the TCM branch line.
NG >> Repair the power supply and the ground circuit.
C
Transfer Control Unit Branch Line Circuit INFOID:0000000003034956

INSPECTION PROCEDURE D
1.CHECK CONNECTOR
1. Turn the ignition switch OFF. E
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the transfer control unit for damage, bend and loose connection
(unit side and connector side).
OK or NG F
OK >> GO TO 2.
NG >> Repair the terminal and connector.
G
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of transfer control unit.
2. Check the resistance between the transfer control unit harness connector terminals. H

Transfer control unit harness connector

Resistance (Ω)
Connector No. Terminal No. I
M105 1 2 Approx. 54 – 66
OK or NG
J
OK >> GO TO 3.
NG >> Repair the transfer control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT LAN
Check the power supply and the ground circuit of the transfer control unit. Refer to TF-20, "Wiring Diagram - T/
F -".
OK or NG L
OK >> • Present error: Replace the transfer control unit. Refer to TF-49, "Removal and Installation".
• Past error: Error was detected in the transfer control unit branch line.
NG >> Repair the power supply and the ground circuit. M
BCM Branch Line Circuit INFOID:0000000003034957

INSPECTION PROCEDURE N
1.CHECK CONNECTOR
1. Turn the ignition switch OFF. O
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the BCM for damage, bend and loose connection (unit side and
connector side).
P
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of BCM.
2. Check the resistance between the BCM harness connector terminals.

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 TROUBLE DIAGNOSIS
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BCM harness connector

Resistance (Ω)
Connector No. Terminal No.
M42 22 21 Approx. 54 – 66
OK or NG
OK >> GO TO 3.
NG >> Repair the BCM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the BCM. Refer to BCS-11, "Schematic".
OK or NG
OK >> • Present error: Replace the BCM. Refer to BCS-16, "Removal and Installation".
• Past error: Error was detected in the BCM branch line.
NG >> Repair the power supply and the ground circuit.
Data Link Connector Branch Line Circuit INFOID:0000000003034958

INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the data link connector for damage, bend and loose connection
(connector side and harness side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
Check the resistance between the data link connector terminals.

Data link connector

Resistance (Ω)
Connector No. Terminal No.
M45 6 14 Approx. 54 – 66
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU
list” included)].
- Procedure for detecting root cause.
• Past error: Error was detected in the data link connector branch line circuit.
NG >> Repair the data link connector branch line.
Combination Meter Branch Line Circuit INFOID:0000000003034961

INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the combination meter for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
Revision: 2009 March LAN-66 D40
 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]
1. Disconnect the connector of combination meter.
2. Check the resistance between the combination meter harness connector terminals. A

Combination meter harness connector

Resistance (Ω)
Connector No. Terminal No. B
M23 12 11 Approx. 54 – 66
OK or NG
C
OK >> GO TO 3.
NG >> Repair the combination meter branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT D
Check the power supply and the ground circuit of the combination meter. Refer to DI-9, "Wiring Diagram -
METER -".
OK or NG E
OK >> • Present error: Replace the combination meter. Refer to DI-17, "Removal and Installation of
Combination Meter".
• Past error: Error was detected in the combination meter branch line. F
NG >> Repair the power supply and the ground circuit.
ABS Actuator and Electric Unit (Control Unit) Branch Line Circuit INFOID:0000000003034964

G
INSPECTION PROCEDURE
1.CHECK CONNECTOR H
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the ABS actuator and electric unit (control unit) for damage, bend
and loose connection (unit side and connector side). I
OK or NG
OK >> GO TO 2.
J
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of ABS actuator and electric unit (control unit). LAN
2. Check the resistance between the ABS actuator and electric unit (control unit) harness connector termi-
nals.
L
ABS actuator and electric unit (control unit) harness connector
Resistance (Ω)
Connector No. Terminal No.
E63 11 15 Approx. 54 – 66 M
OK or NG
OK >> GO TO 3.
NG >> Repair the ABS actuator and electric unit (control unit) branch line. N
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ABS actuator and electric unit (control unit). Refer to O
BRC-9, "Wiring Diagram - ABS -".
OK or NG
OK >> • Present error: Replace the ABS actuator and electric unit (control unit). Refer to BRC-21, P
"Removal and Installation".
• Past error: Error was detected in the ABS actuator and electric unit (control unit) branch line.
NG >> Repair the power supply and the ground circuit.
IPDM E/R Branch Line Circuit INFOID:0000000003034965

INSPECTION PROCEDURE

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors damage, bend and loose connection (unit side and con-
nector side).
- IPDM E/R
- Harness connector E122 (Models without ABS)
- Harness connector M90 (Models without ABS)
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of IPDM E/R.
2. Check the resistance between the IPDM E/R harness connector terminals.

IPDM E/R harness connector

Resistance (Ω)
Connector No. Terminal No.
E17 39 40 Approx. 108 – 132
OK or NG
OK >> GO TO 3.
NG >> Repair the IPDM E/R branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the IPDM E/R. Refer to PG-21, "Schematic".
OK or NG
OK >> • Present error: Replace the IPDM E/R. Refer to PG-23, "Removal and Installation".
• Past error: Error was detected in the IPDM E/R branch line.
NG >> Repair the power supply and the ground circuit.
CAN Communication Circuit INFOID:0000000003034966

INSPECTION PROCEDURE
1.CONNECTOR INSPECTION
1. Turn the ignition switch OFF
2. Disconnect the battery cable from the negative terminal.
3. Disconnect all the unit connectors on CAN communication system.
4. Check terminals and connectors for damage, bend and loose connection.
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the data link connector terminals.

Data link connector

Continuity
Connector No. Terminal No.
M45 6 14 No
OK or NG
OK >> GO TO 3.
NG >> Check the harness and repair the root cause.
3.CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the data link connector and the ground.

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 TROUBLE DIAGNOSIS
< SERVICE INFORMATION > [CAN]

Data link connector A

Continuity
Connector No. Terminal No.
Ground
6 No
M45 B
14 No
OK or NG
OK >> GO TO 4. C
NG >> Check the harness and repair the root cause.
4.CHECK ECM AND IPDM E/R TERMINATION CIRCUIT
1. Remove the ECM and the IPDM E/R. D
2. Check the resistance between the ECM terminals.
- QR25DE models
E
ECM
Resistance (Ω)
Terminal No.
94 86 Approx. 108 – 132
F

- YD25DDTi models
G
ECM
LKIA0037E
Resistance (Ω)
Terminal No.
95 87 Approx. 108 – 132 H
3. Check the resistance between the IPDM E/R terminals.

I
IPDM E/R
Resistance (Ω)
Terminal No.
39 40 Approx. 108 – 132 J
OK or NG
OK >> GO TO 5.
NG >> Replace the ECM and/or the IPDM E/R. LAN
5.CHECK SYMPTOM
Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with L
customer)” are reproduced.
Inspection result
Reproduced>>GO TO 6. M
Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is
detected.
6.CHECK UNIT REPRODUCTION N
Perform the reproduction test as per the following procedure for each unit.
1. Turn the ignition switch OFF
2. Disconnect the battery cable from the negative terminal. O
3. Disconnect one of the unit connectors of CAN communication system.
NOTE:
ECM and IPDM E/R have a termination circuit. Check other units first.
4. Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom P
(Results from interview with customer)” are reproduced.
NOTE:
Although unit-related error symptoms occur, do not confuse them with other symptoms.
Inspection result
Reproduced>>Connect the connector. Check other units as per the above procedure.
Non-reproduced>>Replace the unit whose connector was disconnected.

Revision: 2009 March LAN-69 D40