Infiniti Q45. Manual — part 665
TROUBLE DIAGNOSIS FOR SYSTEM
LAN-109
[CAN]
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LAN
2.
CHECK HARNESS FOR OPEN CIRCUIT
Check resistance between data link connector terminals.
OK or NG
OK
>> Diagnose again. Refer to
NG
>> Repair harness between data link connector and steer-
ing angle sensor.
Combination Meter Circuit Inspection
NKS002J4
1.
CHECK CONNECTOR
1.
Turn ignition switch OFF.
2.
Disconnect the battery cable from the negative terminal.
3.
Check terminals and connector of combination meter for damage, bend and loose connection (meter side
and harness side).
OK or NG
OK
>> GO TO 2.
NG
>> Repair terminal or connector.
2.
CHECK HARNESS FOR OPEN CIRCUIT
1.
Disconnect combination meter connector.
2.
Check resistance between combination meter harness connec-
tor terminals.
OK or NG
OK
>> Replace combination meter.
NG
>> Repair harness between combination meter and data
link connector.
CAN Communication Circuit Inspection
NKS002J5
1.
CHECK CONNECTOR
1.
Turn ignition switch OFF.
2.
Disconnect the battery cable from the negative terminal.
3.
Disconnect the harness connector for each unit on the CAN network and check terminals for deformation,
disconnection, looseness or damage.
OK or NG
OK
>> GO TO 2.
NG
>> Repair terminal or connector as necessary.
Data link
connector
Terminal
Resistance
(Approx.)
M31
6
14
54 – 66
Ω
PKIA9865E
Combination meter
connector
Terminal
Resistance
(Approx.)
M41
15
16
108 – 132
Ω
PKIA9866E
LAN-110
[CAN]
TROUBLE DIAGNOSIS FOR SYSTEM
2.
CHECK HARNESS FOR SHORT CIRCUIT
With all module and control unit connectors disconnected, check
continuity between data link connector terminals.
OK or NG
OK
>> GO TO 3.
NG
>>
●
Repair harness.
●
Change harness if shielded lines are used for the har-
ness.
3.
CHECK HARNESS FOR SHORT CIRCUIT
Check continuity between data link connector terminals and ground.
OK or NG
OK
>> GO TO 4.
NG
>>
●
Repair harness.
●
Change harness if shielded lines are used for the har-
ness.
4.
ECM AND COMBINATION METER INTERNAL CIRCUIT INSPECTION
1.
Remove ECM and combination meter from vehicle.
2.
Check resistance between ECM terminals.
3.
Check resistance between combination meter terminals.
OK or NG
OK
>> GO TO 5.
NG
>> Replace ECM and/or combination meter.
5.
CHECK SYMPTOM
1.
Fill in described symptoms on the column “Symptom” in the check sheet.
2.
Connect all connectors, and then make sure that the symptom is reproduced.
OK or NG
OK
>> GO TO 6.
NG
>> Refer to
LAN-27, "Example of Filling in Check Sheet When Initial Conditions Are Not Reproduced"
.
Terminal
Continuity
6
14
No
SKIA6868E
Terminal
Continuity
6
Ground
No
14
Ground
No
PKIA9872E
Terminal
Resistance (Approx.)
94
86
108 – 132
Ω
Terminal
Resistance (Approx.)
15
16
108 – 132
Ω
PKIA9873E
TROUBLE DIAGNOSIS FOR SYSTEM
LAN-111
[CAN]
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LAN
6.
UNIT REPRODUCIBILITY INSPECTION
Perform the following procedure for each unit on the CAN network, and then perform reproducibility test.
1.
Turn ignition switch OFF.
2.
Disconnect the battery cable from the negative terminal.
3.
Disconnect the unit connector.
4.
Connect the battery cable to the negative terminal.
5.
Make sure that the symptom filled in the “Symptom” of the check sheet is reproduced. (Do not confuse it
with the symptom related to removed unit.)
6.
Make sure that the same symptom is reproduced.
Inspection results
Reproduced>>Install removed unit, and then check the other unit.
Not reproduced>>Replace removed unit.
LAN-112
[CAN]
TROUBLE DIAGNOSIS FOR SYSTEM
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