DTC DETECTION LOGIC

DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause
P1220 | Fuel pump control module (FPCM) | During engine cranking, the signal voltage of the FPCM to the ECM is too low. |

- Harness or connectors
  (FPCM circuit is open or shorted)
  (Fuel pump circuit is open or shorted)
- FPCM

DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

- Before performing the following procedure, confirm that battery voltage is more than 12–15 V at idle.

- Before performing the following procedure, check that the engine coolant temperature is −10°C (14°F) or more.

>>GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for at least 5 seconds.If engine does not start, crank engine for at least 5 seconds.
2. Check DTC.

Is DTC detected?
YES >>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO >>INSPECTION END