DTC ECM-268A

Condition
The control module receives information from the heated oxygen sensor (HO2S) about the fuel/air mixture. 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. Diagnostic Trouble Code (DTC) ECM-268A will be stored if the short-term fuel trim deviates too much from its central position (value) when the long-term fuel trim diagnostics are activated.

Substitute value
- none

Possible source

Upper limit
- intake air leakage
- exhaust system air leakage
- low fuel pressure
- defective heated oxygen sensor (HO2S)

Lower limit
- intake air leakage
- high fuel pressure
- leaking injectors
- defective mass air flow (MAF) sensor
- contaminated engine oil
- oil level too high
- defective heated oxygen sensor (HO2S)

Fault symptom[s]
- none.