1.CHECK ECM POWER SUPPLY

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the voltage between ECM harness connector terminals under the following conditions.

   ECM | Voltage
   Connector | + | −
   Terminal | Terminal
   F102 | 118 | 128 | Battery voltage

Is the inspection result normal?
YES>>GO TO 3.
NO>>GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.

- Harness connectors E106, M6
- 15A fuse (No. 50)
- IPDM E/R harness connector E7
- Harness for open or short between ECM and battery

>>Repair or replace harness or connectors.
3.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
Is the inspection result normal?
YES>>GO TO 4.
NO>>Repair or replace harness or connectors.
4.PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.See DTC Logic (GT-R certified NISSAN dealer).

Is the 1st trip DTC P0603 displayed again?
YES>>GO TO 5.
NO>>INSPECTION END
5.REPLACE ECM

1. Replace ECM.
2. Go to Special Repair Requirement (GT-R certified NISSAN dealer).

>>INSPECTION END