ENGINE SPEED SIGNAL CIRCUIT

With CONSULT-III

1. Turn the ignition switch ON.
   ■ CAUTION ■
   Never start the engine
   
2. Perform ECM self-diagnosis. Refer to CONSULT-III Function (GT-R certified NISSAN dealer).

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

   ECM		Power steering control unit		Continuity
   Connector	Terminal	Connector	Terminal
   M107	113	M108	10	Existed

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

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

   
   

YES>>GO TO 3.

NO>>Repair or replace error-detected parts.

1. Connect ECM harness connectors.
2. Connect power steering control unit harness connector.
3. Check the signal between ECM harness connector and ground with oscilloscope.
   

   ECM		—	Condition		Voltage (Approx.)
   Connector	Terminal
   M107	113	Ground	Engine is running Warm-up condition Idle speed
   			Engine is running Warm-up condition Engine speed: Approx. 2,000 rpm

   
   

YES>>GO TO 4.

NO >>Replace ECM. Refer to Description (GT-R certified NISSAN dealer).

Check the signal between power steering control unit harness connector and ground with oscilloscope.

Power steering control unit		—	Condition		Voltage (Approx.)
Connector	Terminal
M108	10	Ground	Engine is running Warm-up condition Idle speed
			Engine is running Warm-up condition Engine speed: Approx. 2,000 rpm

YES>>GO TO 5.

NO >>Replace power steering control unit. Refer to Exploded View (GT-R certified NISSAN dealer).

• 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.

YES>>INSPECTION END

NO>>Repair or replace error-detected parts.