1.PERFORM ECM SELF-DIAGNOSIS With CONSULT-III

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

Is any DTC detected?
YES>>Check the DTC.
NO >>GO TO 2.
2.CHECK HARNESS BETWEEN ECM AND POWER STEERING CONTROL UNIT

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

Is the inspection result normal?
YES>>GO TO 3.
NO>>Repair or replace error-detected parts.
3.CHECK ENGINE SPEED SIGNAL (1)

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

Is the inspection result normal?
YES>>GO TO 4.
NO >>Replace ECM. Refer to Description (GT-R certified NISSAN dealer).
4.CHECK ENGINE SPEED SIGNAL (2)
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

Is the inspection result normal?
YES>>GO TO 5.
NO >>Replace power steering control unit. Refer to Exploded View (GT-R certified NISSAN dealer).
5.CHECK TERMINALS AND HARNESS CONNECTORS

- 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.