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Symptom:
P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored and Set Condition:
P0440-GENERAL EVAP SYSTEM FAILURE
When Monitored: Engine Running. Fuel Level greater than 12%. Ambient Temperature
between 4°C and 32°C (39°F and 89°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.
GOOD TRIP EQUAL TO ZERO
VISUAL AND PHYSICAL INSPECTION
EVAP PURGE SOLENOID VACUUM SUPPLY INSPECTION
EVAP PURGE SOLENOID STUCK CLOSED
NVLD SWITCH OPERATION
(Z1) GROUND CIRCUIT OPEN
NVLD ASSEMBLY
(K107) NVLD SWITCH SIGNAL CIRCUIT OPEN
EVAPORATIVE EMISSION LEAK DETECTION
PCM
PCM
TEST
1
NOTE: If any of the following DTCs are set (P0443, P0452, P0453, P0498 or
P0499) diagnose them first before continuing with P0440.
Ignition on, engine not running.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Yes → Go To 2
→ Refer to the INTERMITTENT CONDITION symptom in the
No
POSSIBLE CAUSES
ACTION
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
161
APPLICABILITY
All
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