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Home >> Infiniti >> 2015 >> Q50 Base, AWD >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (Vehicle Speed Sensitive P/S) (Exc Hybrid) >> DTC/Circuit Diagnosis >> Engine Speed Signal Circuit >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. PERFORM ECM SELF-DIAGNOSIS

    With CONSULT 

    Perform self-diagnosis for "ENGINE".

    Is any error system detected?

    YES 

    Check the DTC. Refer to DTC INDEX .

    NO 

    GO TO STEP 2. 

  2. CHECK ENGINE SPEED SIGNAL CIRCUIT

    1. Turn the ignition switch OFF.
    2. Disconnect ECM harness connectors.
    3. Disconnect power steering control unit harness connector.
    4. Check the continuity between ECM harness connector and power steering control unit harness connector.
      Power steering control unit ECM Continuity
      Connector Terminal Connector Terminal
      M49 10 M37 110 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 3. 

    NO 

    Repair or replace damaged parts.

  3. CHECK ENGINE SPEED SIGNAL (ECM)

    1. Connect ECM harness connectors.
    2. Check the signal between ECM harness connector and ground with oscilloscope.
      ECM - Condition Value (Approx.)
      Connector Terminal
      M37 110 Ground Engine speed: At idle
      (Warm-up condition)
      GNSJMBIA0076GB-076Courtesy of NISSAN NORTH AMERICA, INC.
      Engine speed: Approx. 2, 000 rpm
      (Warm-up condition)
      GNSJMBIA0077GB-077Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES 

    GO TO STEP 4. 

    NO 

    Replace ECM. Refer to DESCRIPTION .

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

    1. Turn the ignition switch OFF.
    2. Connect power steering control unit harness connector.
    3. Check the signal between power steering control unit harness connector and ground with oscilloscope.
      Power steering control unit - Condition Value (Approx.)
      Connector Terminal
      M49 10 Ground Engine speed: At idle
      (Warm-up condition)
      GNSJMBIA0076GB-076Courtesy of NISSAN NORTH AMERICA, INC.
      Engine speed: Approx. 2, 000 rpm
      (Warm-up condition)
      GNSJMBIA0077GB-077Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES 

    GO TO STEP 5. 

    NO 

    Replace power steering control unit. Refer to REMOVAL AND INSTALLATION .

  5. CHECK TERMINALS AND HARNESS CONNECTORS

    • Check the 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.

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