Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-2120

Condition




This diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers a short-circuit to ground or supply voltage in the signal cable for the front heated oxygen sensor (HO2S) or if there is an open-circuit.
The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute value
- Fuel trim switched off.

Possible source

Signal too high
- Short-circuit to supply voltage in the signal cable
- Short-circuit to ground in the signal cable
- Damaged front heated oxygen sensor (HO2S).

Signal too low
- Open-circuit in the signal cable
- Damaged front heated oxygen sensor (HO2S).

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