P0452

SYMPTOM
P0452-NVLD PRESSURE SWITCH STUCK CLOSED

WHEN MONITORED
Immediately after the engine has been started.

SET CONDITION
The PCM activates the NLVD Solenoid. If PCM does not see NVLD switch open an error is detected. One Trip Fault.

POSSIBLE CAUSES
- Good trip equal to zero
- Vehicle History and Service Bulletin Investigation
- EVAP purge solenoid leaks/stuck open
- (K70) EVAP purge SOL control circuit shorted to ground
- NVLD switch operation
- NVLD assembly
- (K107) NVLD switch signal circuit shorted to ground
- PCM