P0456

Test 1:

Test 2 - Test 3:

Test 4:

Test 5:

Test 6:

SYMPTOM
P0456-EVAP SYSTEM SMALL LEAK

WHEN MONITORED
Ignition off. Fuel Level less than 88%. Ambient Temperature between 4° C to 43° C (39° F to 109° F)

SET CONDITION
Due to temperature changes a vacuum is created in the fuel tank and EVAP system. With the EVAP system sealed, the PCM monitors the NVLD switch. If the NVLD switch does not close within a calibrated amount of time an error is detected.

POSSIBLE CAUSES
- Good trip equal to zero
- Vehicle history and service bulletin investigation
- Visual and physical inspection
- Verify evaporative emission system leak
- EVAP purge solenoid operation
- Evaporative emission leak detection
- GAS cap
- NVLD