Infiniti QX56 (Z62). Manual — part 898
LAN
CAN COMMUNICATION CIRCUIT 1
LAN-169
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 2)]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
CAN COMMUNICATION CIRCUIT 1
Diagnosis Procedure
INFOID:0000000006256313
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 circuit 1.
NOTE:
For identification of CAN communication circuit 1, CAN communication circuit 2, and ITS communication
circuit, refer to
4.
Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair the terminal and connector.
2.
CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the data link connector terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> 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.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> 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.
2.
Check the resistance between the ECM terminals.
3.
Check the resistance between the IPDM E/R terminals.
Is the measurement value within the specification?
YES
>> GO TO 5.
NO
>> Replace the ECM and/or the IPDM E/R.
Data link connector
Continuity
Connector No.
Terminal No.
M4
6
14
Not existed
Data link connector
Ground
Continuity
Connector No.
Terminal No.
M4
6
Not existed
14
Not existed
ECM
Resistance (
Ω
)
Terminal No.
146
151
Approx. 108 – 132
IPDM E/R
Resistance (
Ω
)
Terminal No.
27
26
Approx. 108 – 132
LAN-170
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 2)]
CAN COMMUNICATION CIRCUIT 1
5.
CHECK SYMPTOM
Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with
customer)” are reproduced.
Inspection result
Reproduced>>GO TO 6.
Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is
detected.
6.
CHECK UNIT REPRODUCTION
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.
3.
Disconnect one of the unit connectors of CAN communication circuit 1.
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
(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.
LAN
CAN COMMUNICATION CIRCUIT 2
LAN-171
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 2)]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
CAN COMMUNICATION CIRCUIT 2
Diagnosis Procedure
INFOID:0000000006256314
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 circuit 2.
NOTE:
For identification of CAN communication circuit 1, CAN communication circuit 2, and ITS communication
circuit, refer to
4.
Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair the terminal and connector.
2.
CHECK HARNESS CONTINUITY (SHORT CIRCUIT)
Check the continuity between the data link connector terminals.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> 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.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Check the harness and repair the root cause.
4.
CHECK CAN GATEWAY TERMINATION CIRCUIT
1.
Remove the CAN gateway.
2.
Check the resistance between the CAN gateway terminals.
Is the measurement value within the specification?
YES
>> GO TO 5.
NO
>> Replace the CAN gateway.
5.
CHECK SYMPTOM
Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with
customer)” are reproduced.
Inspection result
Reproduced>>GO TO 6.
Data link connector
Continuity
Connector No.
Terminal No.
M4
13
12
Not existed
Data link connector
Ground
Continuity
Connector No.
Terminal No.
M4
13
Not existed
12
Not existed
CAN gateway
Resistance (
Ω
)
Terminal No.
4
10
Approx. 108 – 132
6
12
Approx. 108 – 132
LAN-172
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 2)]
CAN COMMUNICATION CIRCUIT 2
Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is
detected.
6.
CHECK UNIT REPRODUCTION
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.
3.
Disconnect one of the unit connectors of CAN communication circuit 2.
NOTE:
CAN gateway has two termination circuits. Check other units first.
4.
Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom
(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.
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