Diagnostic trouble code (DTC) information

Condition 

The EVAP canister shut-off valve is closed, this means that the fuel tank system is closed. Canister purge (CP) valve is pulsed, pressure in the fuel tank should drop rapidly. Diagnostic trouble code (DTC) ECM-4308 is stored if the pressure in the fuel tank does not drop rapidly enough.

Substitute Value 

none

Possible Source 

Signal too low: 

• leaking fuel tank, filler pipe, fuel tank filler cap, EVAP canister, EVAP canister shut-off valve or lines between these components
• blocked canister purge (CP) valve, EVAP canister, fuel tank pressure sensor or pipes between these components
• sticking canister purge (CP) valve
• defective fuel tank pressure sensor

Faulty signal: 

• loose connections
• defective fuel tank pressure sensor

Fault symptom[s] 

• none