Diagnosis Procedure

With CONSULT-III 

1. Turn the ignition switch ON.
2. Perform ECM self-diagnosis. Refer to "CONSULT-III FUNCTION " (VQ35HR), "CONSULT-III FUNCTION " (VK50VE).

   Is any DTC detected? 

   YES: Check the DTC.

   NO: GO TO 2.

1. Turn the ignition switch OFF.
2. Disconnect ECM harness connectors.
3. Disconnect power steering control unit harness connector.
4. Check continuity between ECM harness connector and power steering control unit harness connector.
   CONTINUITY REFERENCE
   
   

   ECM		Power steering control unit		Continuity
   Connector	Terminal	Connector	Terminal
   M107 (VQ engine)	110	M108	10	Existed
   M160 (VK engine)	97

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

   Power steering control unit		-	Continuity
   Connector	Terminal
   M108	10	Ground	Not existed

   Is the inspection result normal? 

   YES: GO TO 3.

   NO: Repair or replace damaged parts.

1. Connect ECM harness connectors.
2. Check signal between ECM harness connector and ground with oscilloscope.
   VOLTAGE SPECIFICATION
   
   

   ECM		-	Condition	Voltage (Approx.)
   Connector	Terminal
   M107 (VQ engine) M160 (VK engine)	110 (VQ engine) 97 (VK engine)	Ground	Engine is running Warm-up condition Idle speed	Courtesy of NISSAN MOTOR CO., U.S.A.
   			Engine is running Warm-up condition Engine speed: Approx. 2,000 RPM	Courtesy of NISSAN MOTOR CO., U.S.A.

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Replace ECM. Refer to "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : DESCRIPTION " (VQ engine), "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT (ECM) : DESCRIPTION " (VK engine).

1. Turn the ignition switch OFF.
2. Connect power steering control unit harness connector.
3. Check signal between power steering control unit harness connector and ground with oscilloscope.
   VOLTAGE SPECIFICATION
   
   

   Power steering control unit		-	Condition	Voltage (Approx.)
   Connector	Terminal
   M108	10	Ground	Engine is running Warm-up condition Idle speed	Courtesy of NISSAN MOTOR CO., U.S.A.
   			Engine is running Warm-up condition Engine speed: Approx. 2,000 RPM	Courtesy of NISSAN MOTOR CO., U.S.A.

   Is the inspection result normal? 

   YES: GO TO 5.

   NO: Replace power steering control unit. Refer to "EXPLODED VIEW ".

• 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.