Nissan Altima L32. Manual - part 888

LAN

ECM BRANCH LINE CIRCUIT

LAN-81

< COMPONENT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

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ECM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000004471809

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).

-

ECM

-

Harness connector E30

-

Harness connector M1

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> 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.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> 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 the following.

• QR engine models for California: 

EC-144, "Diagnosis Procedure"

• QR engine models expect for California: 

EC-673, "Diagnosis Procedure"

• VQ engine models: 

EC-1175, "Diagnosis Procedure"

Is the inspection result normal?

YES (Present error)>>Replace the ECM. Refer to the following.

• QR engine models for California: 

EC-27, "ADDITIONAL SERVICE WHEN REPLACING CON-

TROL UNIT : Special Repair Requirement"

• QR engine models except for California: 

EC-563, "ADDITIONAL SERVICE WHEN REPLACING

CONTROL UNIT : Special Repair Requirement"

• VQ engine models: 

EC-1051, "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT :

Special Repair Requirement"

YES (Past error)>>Error was detected in the ECM branch line.

NO

>> Repair the power supply and the ground circuit.

ECM harness connector

Resistance (

Ω)

Connector No.

Terminal No.

E10

98

97

Approx. 108 – 132

LAN-82

< COMPONENT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

A-BAG BRANCH LINE CIRCUIT

A-BAG BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000004203913

1.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

Check the air bag diagnosis sensor unit. Refer to 

SRC-3, "Work Flow"

.

Is the inspection result normal?

YES

>> Replace the main harness.

NO

>> Replace parts whose air bag system has a malfunction.

LAN

AV BRANCH LINE CIRCUIT

LAN-83

< COMPONENT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

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AV BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000004203914

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 AV control unit for damage, bend and loose connection (unit

side and connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1. Disconnect the connector of AV control unit.

2. Check the resistance between the AV control unit harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the AV control unit branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the AV control unit. Refer to 

AV-315, "AV CONTROL UNIT :

Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the AV control unit. Refer to 

AV-437, "Removal and Installation"

.

YES (Past error)>>Error was detected in the AV control unit branch line.

NO

>> Repair the power supply and the ground circuit.

AV control unit harness connector

Resistance (

Ω)

Connector No.

Terminal No.

M46

24

44

Approx. 54 – 66

LAN-84

< COMPONENT DIAGNOSIS >

[CAN SYSTEM (TYPE 4)]

BCM BRANCH LINE CIRCUIT

BCM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000004203915

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 BCM for damage, bend and loose connection (unit side and

connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1. Disconnect the connector of BCM.

2. Check the resistance between the BCM harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the BCM branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the BCM. Refer to 

BCS-42, "Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the BCM. Refer to 

BCS-96, "Removal and Installation"

.

YES (Past error)>>Error was detected in the BCM branch line.

NO

>> Repair the power supply and the ground circuit.

BCM harness connector

Resistance (

Ω)

Connector No.

Terminal No.

M19

79

78

Approx. 54 – 66