Diagnosis Procedure

Combination meter sends vehicle speed signal to power steering control unit.

1. PERFORM COMBINATION METER SELF-DIAGNOSIS 

   With CONSULT

   1. Turn the ignition switch ON.
      CAUTION: Never start the engine
   2. Perform "METER/M&A" self-diagnosis. Refer to Diagnosis Description .

   Is any DTC detected?

   YES

   Check the DTC.

   NO

   GO TO 2.

2. CHECK HARNESS BETWEEN COMBINATION METER AND POWER STEERING CONTROL UNIT 
   1. Turn the ignition switch OFF.
   2. Disconnect combination meter harness connector.
   3. Disconnect power steering control unit harness connector.
   4. Check the continuity between combination meter harness connector and power steering control unit harness connector.

      Combination meter		Power steering control unit		Continuity
      Connector	Terminal	Connector	Terminal
      M53	3	M108	8	Existed

   5. Check the continuity between power steering control unit harness connector and ground.

      Power steering control unit		--	Continuity
      Connector	Terminal
      M108	8	Ground	Not existed

   Is the inspection result normal?

   YES

   GO TO 3.

   NO

   Repair or replace error-detected parts.

3. CHECK VEHICLE SPEED SIGNAL (1) 
   1. Connect combination meter harness connector.
   2. Check the combination meter input/output standard values. Refer to Physical Values .

   Is the inspection result normal?

   YES

   GO TO 4.

   NO

   Replace combination meter. Refer to COMBINATION METER : Exploded View .

4. CHECK VEHICLE SPEED SIGNAL (2) 
   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		Voltage (Approx.)
      Connector	Terminal
      M108	8	Ground	Vehicle speed: 40 km/h (25 MPH) CAUTION: Check air pressure of tire under standard condition.		NOTE: The maximum voltage varies depending on the specification (destination unit). Courtesy of NISSAN NORTH AMERICA, INC.

   Is the inspection result normal?

   YES

   GO TO 5.

   NO

   Replace power steering control unit. Refer to POWER STEERING CONTROL UNIT : Removal & Installation .

5. CHECK TERMINALS AND HARNESS CONNECTORS 
   • Check the power steering control unit pin terminals for damage or loose connection with harness connector.
   • Check the combination meter pin terminals for damage or loose connection with harness connector.

   Is the inspection result normal?

   YES

   INSPECTION END

   NO

   Repair or replace error-detected parts.