P0440

Test 1:

Test 2-4:

Test 5-7:

Test 8:

Test 9:

Test 10-14:

SYMPTOM
P0440-GENERAL EVAP SYSTEM FAILURE

WHEN MONITORED
Engine Running. Fuel Level greater than 12%. Ambient Temperature between 4 degrees C and 32 degrees C (39 degrees F and 89 degrees F)

SET CONDITION
The PCM does not see the NVLD switch close during the medium/large leak test. The PCM will then increase the vacuum supply to the EVAP system by increasing flow through the EVAP Purge valve. If the switch does not close with an increase in vacuum, an error is detected. Two Trip Fault.

POSSIBLE CAUSES
- Good trip equal to zero
- Vehicle history and service bulletin investigation
- Visual and physical inspection
- EVAP purge solenoid vacuum supply inspection
- EVAP purge solenoid
- Verify NVLD switch operation
- (Z201) ground circuit open
- Gas CAP
- Leak at gas CAP
- NVLD assembly
- (K107) NVLD switch signal circuit open
- Evaporative emission leak detection
- PCM