Diagnostic Test

With CONSULT 

Perform self-diagnosis for "ENGINE".

Is any error system detected?

YES 

Check the DTC.

• VQ37VHR FOR USA AND CANADA: Refer to DTC INDEX .
• VK56VD FOR USA AND CANADA: Refer to DTC INDEX .

NO 

GO TO STEP 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.

   Power steering control unit		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   M108	10	M107* 1 M160* 2	110* 1 169* 2	Existed

   * 1: VQ37VHR

   * 2: VK56VD

Is the inspection result normal?

YES 

GO TO STEP 3. 

NO 

Repair or replace damaged parts.

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

   ECM		-	Condition	Value (Approx.)
   Connector	Terminal
   M107* 1 M160* 2	110* 1 169* 2	Ground	Engine speed: At idle (Warm-up condition)	VQ37VHR Courtesy of NISSAN NORTH AMERICA, INC.
   				VK56VD Courtesy of NISSAN NORTH AMERICA, INC.
   			Engine speed: Approx. 2, 000 RPM (Warm-up condition)	VQ37VHR Courtesy of NISSAN NORTH AMERICA, INC.
   				VK56VD Courtesy of NISSAN NORTH AMERICA, INC.

   * 1: VQ37VHR

   * 2: VK56VD

Is the inspection result normal?

YES 

GO TO STEP 4. 

NO 

Replace ECM.

• VQ37VHR FOR USA AND CANADA: Refer to DESCRIPTION .
• VK56VD FOR USA AND CANADA: 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.

   Power steering control unit		-	Condition	Value (Approx.)
   Connector	Terminal
   M108	10	Ground	Engine speed: At idle (Warm-up condition)	VQ37VHR Courtesy of NISSAN NORTH AMERICA, INC.
   				VK56VD Courtesy of NISSAN NORTH AMERICA, INC.
   			Engine speed: Approx. 2, 000 RPM (Warm-up condition)	VQ37VHR Courtesy of NISSAN NORTH AMERICA, INC.
   				VK56VD Courtesy 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 .

• 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.