Diagnostic trouble code (DTC) information
Condition
The control module carries out a flow check of the evaporative emission (EVAP) system. The canister purge (CP) valve is pulsed when the fuel tank system is pressurized. At the same time the control module checks that the pressure in the fuel tank system drops. If the diaphragm in the leak diagnostic pump does not move from the active to the resting position rapidly enough (the pressure does not drop), the control module interprets it as a blockage in the evaporative emission (EVAP) system. For further information about leak diagnostics, see Leak diagnostic .
Substitute Value
None.
Possible Source
- Blocked canister purge (CP) valve
- Blocked hose between the canister purge (CP) valve and the vacuum tank
- Blocked hose between the EVAP canister and the canister purge (CP) valve.
Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.