Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-217C

Condition
The control module receives information from the heated oxygen sensor (HO2S) (bank 2) about the fuel / air mixture when idling and at both the lower and upper 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) will be stored when the long-term trim must be adjusted almost to maximum in the idle range.

Substitute value
- None.

Possible source
- Intake air leakage
- Air leakage in the exhaust system
- Damaged heated oxygen sensor (HO2S) (bank 2).

Fault symptom[s]
- None.