DTC ECM-4338

Condition
If no fault is detected in the leak diagnostic unit, the control module runs a leak diagnostic of the fuel tank system. If the control module detects a leakage that is 1 mm or larger after refueling, the control module interprets this as the fuel tank filler cap missing or loosely installed. Diagnostic trouble code (DTC) ECM-4338 is then stored.

Substitute value
- None.

Possible source

Fuel tank filler cap missing:
- Fuel tank filler cap missing or not tightened
- Leakage that is 1 mm or greater in the fuel tank, fuel filler pipe, fuel tank filler cap, evaporative emission system (EVAP) canister, EVAP canister purge valve, or in the hoses between these components
- The fuel gauge does not function (This fault is detected by the rear electrical module).

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.