Infiniti FX35, FX50 (S51). Manual — part 1312
LAN-190
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 4)]
CAN COMMUNICATION CIRCUIT
CAN COMMUNICATION CIRCUIT
Diagnosis Procedure
INFOID:0000000005577022
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.
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.
-
VQ engine models
-
VK engine models
3.
Check the resistance between the IPDM E/R terminals.
Data link connector
Continuity
Connector No.
Terminal No.
M24
6
14
Not existed
Data link connector
Ground
Continuity
Connector No.
Terminal No.
M24
6
Not existed
14
Not existed
ECM
Resistance (
Ω
)
Terminal No.
114
113
Approx. 108 – 132
ECM
Resistance (
Ω
)
Terminal No.
105
101
Approx. 108 – 132
IPDM E/R
Resistance (
Ω
)
Terminal No.
40
39
Approx. 108 – 132
LKIA0037E
LAN
CAN COMMUNICATION CIRCUIT
LAN-191
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 4)]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
Is the measurement value within the specification?
YES
>> GO TO 5.
NO
>> Replace the ECM and/or the IPDM E/R.
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 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
(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-192
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 5)]
MAIN LINE BETWEEN DLC AND M&A CIRCUIT
DTC/CIRCUIT DIAGNOSIS
MAIN LINE BETWEEN DLC AND M&A CIRCUIT
Diagnosis Procedure
INFOID:0000000005577032
1.
CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1.
Turn the ignition switch OFF.
2.
Disconnect the battery cable 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 connector and the unified meter and A/C amp. harness con-
nector.
Is the inspection result normal?
YES (Present error)>>Check CAN system type decision again.
YES (Past error)>>Error was detected in the main line between the data link connector and the unified meter
and A/C amp.
NO
>> Repair the main line between the data link connector and the unified meter and A/C amp.
Data link connector
Unified meter and A/C amp. harness connector
Continuity
Connector No.
Terminal No.
Connector No.
Terminal No.
M24
6
M67
56
Existed
14
72
Existed
LAN
MAIN LINE BETWEEN M&A AND ADP CIRCUIT
LAN-193
< DTC/CIRCUIT DIAGNOSIS >
[CAN SYSTEM (TYPE 5)]
C
D
E
F
G
H
I
J
K
L
B
A
O
P
N
MAIN LINE BETWEEN M&A AND ADP CIRCUIT
Diagnosis Procedure
INFOID:0000000005577033
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 M7
-
Harness connector B1
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair the terminal and connector.
2.
CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1.
Disconnect the following harness connectors.
-
Unified meter and A/C amp.
-
Harness connectors M7 and B1
2.
Check the continuity between the unified meter and A/C amp. harness connector and the harness con-
nector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair the main line between the unified meter and A/C amp. and the harness connector M7.
3.
CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
Check the continuity between the harness connector terminals.
Is the inspection result normal?
YES (Present error)>>Check CAN system type decision again.
YES (Past error)>>Error was detected in the main line between the unified meter and A/C amp. and the
driver seat control unit.
NO
>> Repair the main line between the harness connector B1 and the driver seat control unit.
Unified meter and A/C amp. harness connector
Harness connector
Continuity
Connector No.
Terminal No.
Connector No.
Terminal No.
M67
56
M7
80
Existed
72
81
Existed
Connector No.
Terminal No.
Continuity
B1
80
82
Existed
81
83
Existed
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