Infiniti M35/M45 Y50. Manual - part 863

TROUBLE DIAGNOSIS

LAN-101

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ICC Sensor Integrated Unit Branch Line Circuit

NKS004H6

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 ICC sensor integrated unit for damage, bend and loose con-
nection (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 ICC sensor integrated unit.

2.

Check the resistance between the ICC sensor integrated unit harness connector terminals.

OK or NG

OK

>> GO TO 3.

NG

>> Repair the ICC sensor integrated unit branch line.

3. 

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the ICC sensor integrated unit. Refer to 

ACS-22, "Sche-

matic"

 .

OK or NG

OK

>>

●

Present error: Replace the ICC sensor integrated unit. Refer to 

ACS-70, "ICC Sensor Inte-

grated Unit"

 .

●

Past error: Error was detected in the ICC sensor integrated unit branch line.

NG

>> Repair the power supply and the ground circuit.

IPDM E/R Branch Line Circuit

NKS004GN

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 IPDM E/R for damage, bend and loose connection (unit side
and connector side).

OK or NG

OK

>> GO TO 2.

NG

>> Repair the terminal and connector.

ICC sensor integrated unit harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

E61

3

6

Approx. 54 – 66

LAN-102

[CAN]

TROUBLE DIAGNOSIS

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.

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-29, "Check IPDM E/R Power

Supply and Ground Circuit"

 .

OK or NG

OK

>>

●

Present error: Replace the IPDM E/R. Refer to 

PG-31, "Removal and Installation of IPDM E/R"

.

●

Past error: Error was detected in the IPDM E/R branch line.

NG

>> Repair the power supply and the ground circuit.

CAN Communication Circuit

NKS004GO

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.

OK or NG

OK

>> GO TO 3.

NG

>> Check the harness and repair the root cause.

IPDM E/R harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

E9

49

50

Approx. 108 – 132

Data link connector

Continuity

Connector No.

Terminal No.

M60

6

14

No

TROUBLE DIAGNOSIS

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3. 

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the data link connector and the ground.

OK or NG

OK

>> GO TO 4.

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.

2.

Check the resistance between the ECM terminals.

3.

Check the resistance between the IPDM E/R terminals.

OK or NG

OK

>> GO TO 5.

NG

>> Replace the ECM 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 of 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 unit whose connector was disconnected.

Data link connector

Ground

Continuity

Connector No.

Terminal No.

M60

6

No

14

No

ECM

Resistance (

Ω

)

Terminal No.

94

86

Approx. 108 – 132

IPDM E/R

Resistance (

Ω

)

Terminal No.

49

50

Approx. 108 – 132

LKIA0037E

LAN-104

[CAN]

TROUBLE DIAGNOSIS