Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-2A0A

Condition




The engine control module (ECM) checks that there are no faults in the probe or the wiring. Diagnostic trouble code (DTC) ECM-2A0A is stored if the control module registers that the signal deviates from the permitted operating range.

Substitute value
- twin heated oxygen sensor (HO2S) control is disabled
- Three-way catalytic converter (TWC) diagnostics are disabled.

Possible source

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

Signal too low:
- Short-circuit to ground in the signal cable
- Short-circuit to ground in the ground lead
- Defective heated oxygen sensor (HO2S).

Faulty signal:
- Short-circuit in the signal cable for the pre-heating circuit
- Short-circuit in the ground lead for the preheating circuit
- Defective heated oxygen sensor (HO2S).

Signal missing:
- Contact resistance or oxidation in the connectors
- Open-circuit in the signal cable
- Open-circuit in the ground lead
- Defective heated oxygen sensor (HO2S).

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