Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-4000

Condition




The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the signal from the evaporative emission system (EVAP) valve is too high, too low or missing.
The diagnostic is active at ignition on and with the engine running.

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

Possible source

Signal too high
- Short-circuit to supply voltage in the signal cable
- Damaged evaporative emission system (EVAP) valve.

Signal too low
- Short-circuit to ground in the signal cable.

Signal missing
- Open-circuit in the signal cable
- Damaged evaporative emission system (EVAP) valve
- Contact resistance in the terminals
- Open-circuit in the power cable.

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