2008 INFINITI FX35 ECU

LAN-22
< SERVICE INFORMATION >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Identify the error circuit using information from t
he “CAN DIAG SUPPORT MNTR” (“ECU list” included).
1. ECU list: Check the items indicat ed in “ECU list”. Draw a line on the diagnosis sheet to indicate the error
circuit.
NOTE:
CAN communication line has no error if units other than Diag on CAN units are not indicated. An error
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 “E CU 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).
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-5, "
Diag on CAN".
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.
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:
If “UNKWN” is indicated on “TRANSMIT DIAG”, t hen 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 “T CM”, “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).
PKID1214E
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TROUBLE DIAGNOSES WORK FLOWLAN-27
< SERVICE INFORMATION > [CAN FUNDAMENTAL]
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5. Perform the inspection for the detected error ci rcuit. For the inspection procedure, refer to LAN-68, "Mal-
function Area Chart".
Present Error — Short Circuit —
When the symptoms listed below exist, a short circui t of the CAN communication line is a possible cause.
Received data
Error symptom Most the units connected to the CAN communication system go into fail-safe mode or are deactivated.
Inspection procedure
PKID1219E
Item (CONSULT-III) Indication
ECU list (on the CAN DIAG SUPPORT MNTR) A ll Diag on CAN units are not indicated.
CAN DIAG SUPPORT MNTR “UNKWN” is indicated un der “TRANSMIT DIAG” and most reception items.
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HOW TO USE THIS SECTIONLAN-37
< SERVICE INFORMATION > [CAN]
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HOW TO USE THIS SECTION
CautionINFOID:0000000001328628
 This section describes information peculiar to a v ehicle, sheets for trouble diagnosis, and inspection proce-
dures.
 For trouble diagnosis procedure LAN-14, "
Trouble Diagnosis Procedure".
Abbreviation ListINFOID:0000000001328629
Abbreviations in CAN communication signal chart, and the diagnosis sheet are as per the following list.
Abbreviation Unit name SELECT SYSTEM
(CONSULT-III) CAN DIAG SUPPORT MNTR
(CONSULT-III)
4WD AWD control unit ALL MODE AWD/4WD AWD/4WD
A-BAG Air bag diagnosis sensor unit AIR BAG – ABS ABS actuator and electric un it (control unit) ABS VDC/TCS/ABS
ADP Driver seat control unit AUTO DRIVE POS. –
BCM BCM BCM BCM/SEC
DISP Display control unit – DISPLAY DLC Data link connector – –
ECM ECM ENGINE ECM
ICC ICC unit ICC ICC
ICC/e4WD
I-KEY Intelligent Key unit INTELLIGENT KEY I-KEY
IPDM-E IPDM E/R IPDM E/R IPDM E/R LANE LDW camera unit LDW –
LASER ICC sensor – ICC SENSOR M&A Unified meter and A/C amp. METER/M&A METER/M&A
STRG Steering angle sensor – STRG TCM TCM TRANSMISSION TCM
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TROUBLE DIAGNOSISLAN-69
< SERVICE INFORMATION > [CAN]
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SHORT CIRCUIT
Main Line Between TCM an d Data Link ConnectorINFOID:0000000001328650
INSPECTION PROCEDURE
1.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Disconnect the following harness connectors.
-ECM
- Harness connectors M82 and F102
4. Check the continuity between the har ness connector and the data link connector.
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)].
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
 Past error: Error was detected in the main line between the TCM and the data link connector.
NG >> Repair the main line between the harness connector M82 and the data link connector.
Main Line Between Data Link Conne ctor and Unified Meter and A/C Amp.INFOID:0000000001328651
INSPECTION PROCEDURE
1.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Disconnect the following harness connectors.
-ECM
- Unified meter and A/C amp.
4. Check the continuity between the data link c onnector and the unified meter and A/C amp. harness con-
nector.
Data link connector branch line circuit LAN-75, "Data Link Connector Branch Line Circuit"
Intelligent Key unit branch line circuitLAN-76, "Intelligent Key Unit Branch Line Circuit"
LDW camera unit branch line circuitLAN-76, "LDW Camera Unit Branch Line Circuit"
Steering angle sensor branch line circuit LAN-77, "Steering Angle Sensor Branch Line Circuit"
Unified meter and A/C amp. branch line circuit LAN-78, "Unified Meter and A/C Amp. Branch Line Circuit"
ABS actuator and electric unit (control unit) branch line circuit LAN-78, "ABS Actuator and Electric Unit (Control Unit) Branch
Line Circuit"
ICC sensor branch line circuit
LAN-79, "ICC Sensor Branch Line Circuit"
Driver seat control unit branch line circuitLAN-79, "Driver Seat Control Unit Branch Line Circuit"
IPDM E/R branch line circuit LAN-80, "IPDM E/R Branch Line Circuit"
Malfunction Area Reference
Malfunction Area Reference
CAN communication circuit LAN-81, "
CAN Communication Circuit"
Harness connector Data link connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
M82 14H
M5 6Yes
15H 14 Yes
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LAN-70
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
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)].
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
 Past error: Error was detected in the main line between the data link connector and the unified
meter and A/C amp.
NG >> Repair the main line between the data link connector and the unified meter and A/C amp.
Main Line Between Unified Meter and A/C Am p. and ABS Actuator and Electric Unit
(Control Unit)
INFOID:0000000001328652
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 M41
- Harness connector E211
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the following harness connectors.
- Unified meter and A/C amp.
- Harness connectors M41 and E211
2. Check the continuity between the unified mete r and A/C amp. harness connector and the harness con-
nector.
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the unified meter and A/C amp. and the harness connector M41.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the connector of ABS actuat or and electric unit (control unit).
2. Check the continuity between the harness connector and the ABS actuator and electric unit (control unit)
harness connector.
Data link connector Unified meter and A/C amp. harness connector Continuity
Connector No. Terminal No. Connector No. Terminal No.
M5 6
M55 1Yes
14 11 Yes
Unified meter and A/C amp. harness connector Harness connector Continuity
Connector No. Terminal No. Connector No. Terminal No.
M55 1
M41 29G Yes
11 18G Yes
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TROUBLE DIAGNOSISLAN-71
< SERVICE INFORMATION > [CAN]
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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)].
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
 Past error: Error was detected in the main line between the unified meter and A/C amp. and the
ABS actuator and electric unit (control unit).
NG >> Repair the main line between the harness connec tor E211 and the ABS actuator and electric unit
(control unit).
Main Line Between ABS Actuator and Electric Unit (Control Unit) and Driver Seat Con-
trol Unit
INFOID:0000000001328653
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cabl e from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (connector side
and harness side).
- Harness connector E205
- Harness connector B5
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the following harness connectors.
- ABS actuator and electric unit (control unit)
- Harness connectors E205 and B5
2. Check the continuity between the ABS actuator and electric unit (control unit) harness connector and the
harness connector.
OK or NG
OK >> GO TO 3.
NG >> Repair the main line between the ABS actuat or and electric unit (control unit) and the harness
connector E205.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect the harness connectors B8 and B151.
2. Check the continuity between the harness connectors.
Harness connector ABS actuator and electric unit (control unit)
harness connector Continuity
Connector No. Terminal No. Connector No. Terminal No.
E211 29G
E56 11 Ye s
18G 15 Yes
ABS actuator and electric unit (control unit) harness connector Harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
E56 11
E205 4Yes
15 10 Yes
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LAN-72
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
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)].
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
 Past error: Error was detected in the main li ne between the ABS actuator and electric unit (con-
trol unit) and the driver seat control unit.
NG >> Repair the main line between the harness connectors B5 and B8.
ECM Branch Line CircuitINFOID:0000000001328654
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 ECM 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 ECM.
2. Check the resistance between the ECM harness connector terminals.
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 EC-141, "
Diagnosis Procedure"
(VQ35DE), EC-719, "Diagnosis Procedure" (VK45DE).
OK or NG
OK >>  Present error: Replace the ECM. Refer to EC-100, "Engine Control Component Parts Loca-
tion"(VQ35DE), EC-677, "Engine Control Component Parts Location" (VK45DE).
 Past error: Error was detected in the ECM branch line.
NG >> Repair the power supply and the ground circuit.
AWD Control Unit Branch Line CircuitINFOID:0000000001328655
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
Harness connector Harness connector Continuity
Connector No. Terminal No. Connector No. Terminal No.
B5 4
B8 10 Yes
10 9 Yes
ECM harness connector Resistance (Ω)
Connector No. Terminal No.
M90 94 86 Approx. 108 – 132
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LAN-76
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
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)].
- Not copied from on-board diagnosis.
- 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.
Intelligent Key Unit Branch Line CircuitINFOID:0000000001328661
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 Inte lligent Key unit 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 Intelligent Key unit.
2. Check the resistance between the Intelligent Key unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the Intelligent Key unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the Intelligent Key unit. Refer to B L - 111 , "
Check Intelligent
Key Unit Power Supply and Ground Circuit".
OK or NG
OK >>  Present error: Replace the Intelligent Key unit. Refer to BL-130, "Removal and Installation of
Intelligent Key Unit".
 Past error: Error was detected in the Intelligent Key unit branch line.
NG >> Repair the power supply and the ground circuit.
LDW Camera Unit Branch Line CircuitINFOID:0000000001328662
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 (unit side and con-
nector side).
- LDW camera unit
Data link connector Resistance (Ω)
Connector No. Terminal No.
M5 6 14 Approx. 54 – 66
Intelligent Key unit harness connector Resistance (Ω)
Connector No. Terminal No.
M34 2 3 Approx. 54 – 66
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