Diagnosis Procedure

With CONSULT-III 

Perform "ENGINE" self-diagnosis.

Is any DTC detected? 

YES: Check the DTC. Refer to "DTC INDEX ".

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 the continuity between ECM harness connector and power steering control unit harness connector.
   CONTINUITY SPECIFICATION
   
   

   ECM		Power steering control unit		Continuity
   Connector	Terminal	Connector	Terminal
   E80	169	M108	10	Existed

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

   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 error-detected parts.

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

   ECM		-	Condition	Voltage (Approx.)
   Connector	Terminal
   E80	169	Ground	Engine is running Warm-up condition Idle speed	Courtesy of NISSAN MOTOR CO.
   			Engine is running Warm-up condition Engine speed: Approx. 2,000 RPM	Courtesy of NISSAN MOTOR CO.

   Is the inspection result normal? 

   YES: GO TO 4.

   NO: Replace ECM. Refer to "DESCRIPTION ".

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.
   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.
   			Engine is running Warm-up condition Engine speed: Approx. 2,000 RPM	Courtesy of NISSAN MOTOR CO.

   Is the inspection result normal? 

   YES: GO TO 5.

   NO: Replace power steering control unit. Refer to "REMOVAL AND INSTALLATION ".

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