Diagnostic Trouble Code (DTC) Information

ECM-4308 LEAK DIAGNOSTIC LARGE LEAK
DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION




Condition
when the EVAP canister shut-off valve is closed the fuel tank system should be sealed. When the EVAP canister purge (CP) valve is activated the fuel tank pressure must fall to a set negative pressure or it will be interpreted as a major leak. Then the canister purge (CP) valve closes. Fuel tank pressure must then remain within certain limits or it will be interpreted as a minor leak. Diagnostic trouble code (DTC) ECM-4308 is stored if the control module registers a minor or major leak.

Condition
None.

Possible source

Major leak:
- Leaking fuel tank, filler pipe, fuel tank filler cap, evaporative emission system (EVAP) canister, evaporative emission system (EVAP) canister shut-off valve or lines between these components
- Blocked evaporative emission system (EVAP) valve
- Blocked hoses to the fuel tank pressure sensor or defective fuel tank pressure sensor. Does not react to changes in pressure.

Minor leak:
- Leaking fuel tank, filler pipe, fuel tank filler cap, EVAP canister, canister purge (CP) valve or lines between these components

Condition
None.