Nissan Altima 2007-2012 Service Manual: Engine speed signal circuit

Description

• ECM sends engine speed signal to power steering control unit.

Diagnosis Procedure

1.PERFORM ECM SELF-DIAGNOSIS

Perform ECM self-diagnosis.

Is any error system detected? YES >> Check the error system.

NO >> GO TO 2.

2.CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT

1. Turn the ignition switch OFF.

2. Disconnect ECM harness connector E10.

3. Disconnect power steering control unit harness connector.

4. Check continuity between ECM harness connector E10 (A) terminal 94 and power steering control unit harness connector M59 (B) terminal 10.

Also check harness for short to ground and short to power.

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

NO >> Repair or replace damaged parts.

3.CHECK ENGINE SPEED SIGNAL (ECM SIDE)

1. Turn the ignition switch OFF.

2. Connect ECM harness connector.

3. Check signal between ECM harness connector E10 terminal 94 and ground with oscilloscope.

Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 4.

NO >> Replace ECM. Refer to EC-34, "Component Parts Location" (QR25DE for California), EC-570, "Component Parts Location" (QR25DE except for California), EC-1058, "Component Parts Location" (VQ35DE).

4.CHECK ENGINE SPEED SIGNAL (POWER STEERING CONTROL UNIT SIDE)

1. Turn the ignition switch OFF.

2. Connect power steering control unit harness connector.

3. Check signal between power steering control unit harness connector M59 terminal 10 and ground with oscilloscope.

Also check harness for short to ground and short to power.

Is the inspection result normal? YES >> GO TO 5.

NO >> Replace power steering control unit.

5.CHECK TERMINALS AND HARNESS CONNECTORS

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

• Check ECM 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 ...

    Vehicle speed signal circuit
    Description • Combination meter sends vehicle speed signal to power steering control unit. Diagnosis Procedure 1.PERFORM COMBINATION METER SELF-DIAGNOSIS Perform combination meter self-diagno ...

    Other materials:

    Throttle valve closed position learning
     Description Throttle Valve Closed Position Learning is a function of ECM to learn the fully closed position of the throttle valve by monitoring the throttle position sensor output signal. It must be performed each time harness connector of electric throttle control actuator or ECM is d ...

    B1150 – B1153 side curtain air bag module LH
    Description DTC B1150 – B1153 LH SIDE CURTAIN AIR BAG MODULE The LH side curtain air bag module is wired to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit will monitor for opens and shorts in detected lines to the LH side curtain air bag module. PART LOCATION Refer t ...

    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 ...