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.

    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:

    None of the power windows can be operated using any switch
    Diagnosis Procedure 1. CHECK BCM POWER SUPPLY AND GROUND CIRCUIT Check BCM power supply and ground circuit. Refer to BCS-42, "Diagnosis Procedure". Is the inspection result normal? YES >> GO TO 2 NO >> Repair or replace the malfunctioning parts. 2. CHECK MAIN POWER W ...

    P0300, P0301, P0302, P0303, P0304 misfire
    DTC Logic DTC DETECTION LOGIC When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor (POS) signal to vary, ECM can determine that a misfire is occurring. The misfire detection logic consists of the following ...

    Precaution
    Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along with a front seat belt, helps to reduce the risk or severity of injury to the dr ...