1.CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
4. Check the voltage between fuel injector harness connector and ground.

   Fuel injector | Ground | Voltage
   Cylinder | Connector | Terminal
   1 | F121 | 1 | Ground | Battery voltage
   2 | F122 | 1
   3 | F123 | 1
   4 | F124 | 1
   5 | F125 | 1
   6 | F126 | 1

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

- Harness connectors F48, F120
- Harness connectors F103, M116
- Harness connectors E106, M6
- IPDM E/R harness connector E7
- 10A fuse (No. 44)
- Harness for open or short between fuel injector and fuse

>>Repair open circuit, short to ground or short to power in harness or connectors.
3.CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between fuel injector harness connector and ECM harness connector.

   Fuel injector | ECM | Continuity
   Cylinder | Connector | Terminal | Connector | Terminal
   1 | F121 | 2 | F102 | 25 | Existed
   2 | F122 | 2 | 21
   3 | F123 | 2 | 17
   4 | F124 | 2 | 37
   5 | F125 | 2 | 41
   6 | F126 | 2 | 45

4. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 5.
NO>>GO TO 4
4.DETECT MALFUNCTIONING PART
Check the following.

- Harness connectors F48, F120
- Harness for open or short between fuel injector and ECM

>>Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK FUEL INJECTOR
Refer to Component Inspection (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 6.
NO>>Replace malfunctioning fuel injector.
6.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
Is the inspection result normal?
YES>>Replace IPDM E/R.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.