Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-2A00

Condition




The engine control module (ECM) assumes two initial values for probe voltage, 0 V and 5 V. If probe preheating is active and if at least one fuel shut-off has been made, the heated oxygen sensor (HO2S) maximum value must have exceeded 0.3 V and the minimum value must have been below 1.0 V. The diagnostic trouble code (DTC) is stored and the engine control module (ECM) interprets it as a fault if these limit values are not achieved after approximately 5 minutes and both the accumulated and actual heated oxygen sensor preheating have reached certain limit values.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
- Center heated oxygen sensor (HO2S) control shut off.

Possible source

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

Signal too low
- Short-circuit to ground in the signal cable
- Open-circuit in the signal cable
- Damaged center heated oxygen sensor (HO2S).

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