Diagnostic Trouble Code (DTC) Information ECM-214D: Notes

Condition 

This diagnostic trouble code can only be stored during lambda regulation quick tests. This is a workshop test, for detecting air leaks or low fuel pressure. During the quick test, the Engine control module (ECM) receives information from the heated oxygen sensor about the fuel/air mixture with reset fuel adaptations. If the fuel/air mixture is outside certain parameters, this means that there is a fault that can cause diagnostic trouble codes related to lambda regulation to be stored during normal operation. I. e. diagnostic trouble codes ECM-21AC, ECM-21AD, ECM-21CC or ECM-21DD.

The diagnostic trouble code (DTC) is stored if the control module detects that:

• Fuel/air mixture (lambda) deviates abnormally from the expected (λ=1).

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

• Activate quick test

Substitute Value 

• None.

Possible Source 

• Air leakage in the intake system.
• Low fuel pressure. High fuel pressure.
• Leaking injectors.
• Damaged mass air flow (MAF) sensor.
• Contaminated engine oil.
• Oil level too high.
• Damaged heated oxygen sensor (HO2S).

Fault symptom[s] 

• None.