Diagnostic trouble code (DTC) information
Condition
The EVAP canister shut-off valve is open and the fuel tank system is vented. The canister purge (CP) valve is pulsed and because of the vacuum in the intake manifold the engine starts to suck air through the EVAP canister. Because the engine control module (ECM) is open the pressure in the fuel tank will start to drop slowly, if the pressure in the fuel tank drops too rapidly diagnostic trouble code (DTC) ECM-4019 is stored.
Substitute Value
leak diagnostic disabled
Possible Source
- blocked/sticking EVAP canister shut-off valve
- blocked EVAP canister shut-off valve filter
- blocked EVAP canister shut-off valve hose connector on EVAP canister
- blocked/jammed hose between EVAP canister and EVAP canister shut-off valve or filter and EVAP canister shut-off valve
- leaking canister purge (CP) valve
- fuel tank pressure sensor steady under 1000 Pa
Fault symptom[s]
- none