Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information EFI-233

EFI-233 Adaptive idle air trim

Condition




Diagnostic trouble code (DTC) EFI-233 is stored when the air mass through the valve increases or decreases too much, in order to hold the correct idling speed.
The permitted range for idle air trim adaptation is between +22Kg/h (upper limit and -8Kg/h (lower limit).

Substitute value
- none.

Possible source

Upper limit:
- blocked air cleaner (ACL) or air intake
- contact resistance in terminals
- incorrectly adjusted throttle body
- defective idle air control (IAC) valve

Lower limit:
- air leakage
- contact resistance in terminals
- incorrectly adjusted throttle body
- defective idle air control (IAC) valve.

Fault symptom[s]
- idling speed too high or low.