DTC DETECTION LOGIC If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause
P0451 | EVAP control system pressure sensor performance | ECM detects a sloshing signal from the EVAP control system pressure sensor |

- Harness or connectors
  (EVAP control system pressure sensor circuit is shorted.)
- EVAP control system pressure sensor

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.

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

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and wait at least 40 seconds.
   NOTE：
   Do not depress accelerator pedal even slightly.
3. Check 1st trip DTC.

Is 1st trip DTC detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>INSPECTION END