Diagnostic Trouble Code (DTC) Information ECM-4308

Condition 

The engine control module (ECM) checks for leaks in the fuel system by taking a reading of the power consumption of the leak diagnosis pump during pressurization.

If a certain pressure is not achieved in the system within a reasonable time, the engine control module (ECM) interprets this as leakage from the fuel injection system.

The diagnostic trouble code (DTC) can be diagnosed when the leak diagnostic system is run.

Substitute Value 

• None.

Possible Source 

Minor leak 

• Leaking fuel tank, fuel filler pipe, fuel tank filler cap, EVAP canister, evaporative emission system (EVAP) valve, or in the hoses between these components.

Major leak 

• The fuel tank filler cap is not correctly tightened or is missing
• Leaking fuel tank, fuel filler pipe, fuel tank filler cap, EVAP canister, evaporative emission system (EVAP) valve, or in the hoses between these components.

Fault symptom[s] 

• Malfunction indicator lamp (MIL) lit.