Nissan Altima L32. Instruction — part 388

POWER SUPPLY AND GROUND CIRCUIT

EC-673

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000004349639

1.

INSPECTION START

Start engine.
Is engine running?

YES

>> GO TO 8.

NO

>> GO TO 2.

2.

CHECK ECM POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF and then ON.

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

• IPDM E/R harness connector E18

• 10A fuse (No. 35)

• Harness for open or short between ECM and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

4.

CHECK GROUND CONNECTION-I

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in

GI-45, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace ground connection.

5.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1. Disconnect ECM harness connectors.

2. Check the continuity between ECM harness connector and ground.

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 7.

ECM

Ground

Voltage

Connector

Terminal

E10

93

Ground

Battery voltage

PBIA9561J

ECM

Ground

Continuity

Connector

Terminal

F14

12

Ground

Existed

16

E10

107

108

111

112

EC-674

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

POWER SUPPLY AND GROUND CIRCUIT

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F2, E11

• Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

7.

CHECK ECM POWER SUPPLY CIRCUIT-II

1. Reconnect ECM harness connectors.

2. Turn ignition switch ON.

3. Check the voltage between IPDM E/R harness connector and

ground.

Is the inspection result normal?

YES

>> Go to

EC-963, "Diagnosis Procedure"

.

NO

>> GO TO 8.

8.

CHECK ECM POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 14.

NO-1 >> Battery voltage does not exist: GO TO 9.

NO-2 >> Battery voltage exists for more than a few seconds: GO TO 12.

9.

CHECK ECM POWER SUPPLY CIRCUIT-IV

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Check the voltage between ECM harness connector and

ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 12.

10.

CHECK ECM POWER SUPPLY CIRCUIT-V

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector E18.

3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

IPDM E/R

Ground

Voltage

Connector

Terminal

F10

53

Ground

Battery voltage

JMBIA1581ZZ

ECM

Ground

Voltage

Connector

Terminal

E10

105

Ground

After turning ignition switch OFF, battery volt-
age will exist for a few seconds, then drop ap-
proximately 0V.

PBIB3037E

ECM

Ground

Voltage

Connector

Terminal

F14

24

Ground

Battery voltage

JMBIA1582ZZ

POWER SUPPLY AND GROUND CIRCUIT

EC-675

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

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4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

• Junction block connectors E44, E45

• Harness for open or short between ECM and IPDM E/R

>> Repair open circuit or short to ground or short to power in harness or connectors.

12.

CHECK ECM POWER SUPPLY CIRCUIT-VI

1. Disconnect ECM harness connector.

2. Disconnect IPDM E/R harness connector F10.

3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair open circuit or short to ground or short power in harness or connectors.

13.

CHECK 15A FUSE

1. Disconnect 15A fuse (No. 42) from IPDM E/R.

2. Check 15A fuse.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> Replace 15A fuse.

14.

CHECK GROUND CONNECTION-II

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in

GI-45, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Repair or replace ground connection.

15.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

1. Disconnect ECM harness connector.

2. Check the continuity between ECM harness connector and ground.

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E10

105

E18

10

Existed

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F14

24

F10

69

Existed

EC-676

< COMPONENT DIAGNOSIS >

[QR25DE EXCEPT FOR CALIFORNIA]

POWER SUPPLY AND GROUND CIRCUIT

3. Also check harness for short to power.
Is the inspection result normal?

YES

>> GO TO 17.

NO

>> GO TO 16.

16.

DETECT MALFUNCTIONING PART

Check the following.

• Harness or connectors F2, E11

• Harness for open or short between ECM and ground

>> Repair open circuit or short to power in harness or connectors.

17.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair open circuit or short to power in harness or connectors.

ECM

Ground

Continuity

Connector

Terminal

F14

12

Ground

Existed

16

E10

107

108

111

112