NGC

SYMPTOM
P0442-EVAP SYSTEM MEDIUM LEAK

TEST NOTE
All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0442-EVAP SYSTEM MEDUIM LEAK.

WHEN MONITORED
Engine Running. Cold start test. Fuel level greater than 12%. Ambient temperature between 4 °C and 32 °C (39 °F and 89 °F) Close loop fuel system. Test runs when small leak test is maturing.

SET CONDITION
The PCM activates the EVAP Purge Solenoid to pull the EVAP system into a vacuum to close the NVLD switch. Once the NVLD switch is closed, the PCM turns the EVAP Purge solenoid off to seal the EVAP system. If the NVLD switch reopens before the calibrated amount of time for a Meduim leak an error is detected. Two Trip Fault.

POSSIBLE CAUSES
- Good Trip to Zero
- Leak at Gas Cap
- 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