Diagnostic trouble code (DTC) information ECM-439C
Condition
If no fault has been detected in the leak diagnostic unit, the engine control module (ECM) carries out a leak diagnostic of the fuel tank system. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects a leak which is larger than 1.0 mm.
Substitute Value
None.
Possible Source
- The fuel tank filler cap is missing or not properly tightened
- Leakage that is 1.0 mm or greater in the fuel tank, fuel filler pipe, fuel tank filler cap, EVAP canister, canister purge (CP) valve, or in the hoses between these components.
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.