Nissan Altima 2007-2012 Service Manual: Power supply and ground circuit

Description

• EPS system functions by ignition power supply.

Diagnosis Procedure

1.CHECK POWER SUPPLY

1. Turn the ignition switch OFF.

2. Disconnect power steering control unit harness connector.

3. Check voltage between power steering control unit harness connector M59 terminal 3 and ground.

4. Turn the ignition switch ON.

CAUTION: Never start the engine.

5. Check voltage between power steering control unit harness connector M59 terminal 3 and ground.

Is the inspection result normal? YES >> GO TO 2.

NO >> Check the following. If any items are damaged, repair or replace damaged parts.

• 10A fuses (#3) open - Harness for short or open between ignition switch and power steering control unit harness connector No. 3 terminal.

- Ignition switch.

2.CHECK GROUND CIRCUIT

1. Turn the ignition switch OFF.

2. Check continuity between power steering control unit harness connector M59 terminal 6 and ground.

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair open circuit or short to power in harness or connectors.

3.CHECK TERMINALS AND HARNESS CONNECTORS

Check power steering control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal? YES >> Inspection End

NO >> Repair or replace damaged parts.

    Component diagnosis
    ...

    Power steering solenoid valve
    Description • Power steering solenoid valve controls the power steering oil pressure in the gear housing assembly. Diagnosis Procedure 1.CHECK POWER STEERING SOLENOID VALVE SIGNAL 1. Start e ...

    Other materials:

    The parking brake release warning continues displaying, or does not display
    Description • The parking brake warning is displayed while driving the vehicle even though the parking brake is released. • The parking brake warning is not displayed even though driving the vehicle with the parking brake applied. Diagnosis Procedure 1.CHECK PARKING BRAKE WARNING LAM ...

    B2193, P1612 chain of ECM-IMMU
    Description BCM performs the ID verification with ECM that allows the engine to start. Start the engine if the ID is OK. ECM prevents the engine from starting if the ID is not registered. BCM starts the communication with ECM if ignition switch is turned ON. DTC Logic DTC DETECTION LOGI ...

    Rear tweeter (coupe)
    Description The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the rear tweeters using the audio signal circuits. Diagnosis Procedure 1.HARNESS CHECK 1. Disconnect BOSE speaker amp. connectors B121, B122 and ...