Idle Control System Fuel Quantity Lower Than Expected
At idle the ECU expects a calibrated fuel quantity to maintain set-speed. The actual quantity is significantly less than modelled - typical for a tight engine, very low friction, dragging accessory load missing, or implausible idle airflow.
Affected components
- Idle control strategy
- Fuel metering
Common causes
- High likelihood: Expected accessory load missing
- Medium likelihood: Idle airflow offset
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.