DTC ECM-4000

Condition







Diagnostic trouble code (DTC) ECM-4000 is stored if the signal from the canister purge (CP) valve is too high, too low or missing.

Substitute value
- twin heated oxygen sensor (HO2S) control disabled.

Possible source

Signal too high:
- short-circuit to supply voltage in the signal cable
- defective canister purge (CP) valve

Signal too low:
- short-circuit to ground in the signal cable

Signal missing:
- open-circuit in the signal cable
- defective canister purge (CP) valve
- contact resistance in terminals
- open-circuit in power cable

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.