Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-212D

Condition
The engine control module (ECM) receives information from the heated oxygen sensor (HO2S) (bank 1) about the fuel / air mixture when idling and at both the upper and lower part-load range. If the fuel / air mixture deviates from lambda=1, the short-term fuel trim will compensate for this by adjusting the injection time so that lambda=1 is achieved. When the short-term fuel trim makes an adjustment, the integrator median must be adjusted by the long-term trim. The diagnostic trouble code (DTC) is stored when the long-term trim must be adjusted to almost maximum in the lower part load area.

Substitute value
- None.

Possible source
- Intake air leakage
- High fuel pressure
- Leaking injectors
- Damaged mass air flow (MAF) sensor
- Contaminated engine oil
- Oil level too high
- Damaged heated oxygen sensor (HO2S) (bank 1).

Fault symptom[s]
- Fuel system/Excessive fuel consumption