Measured idle RPM is lower than the commanded idle.
SYMPTOMS
- Check-engine light
- Low or rough idle
- Possible stalling
LIKELY CAUSES
- Dirty throttle body
- Vacuum leak
- High electrical/mechanical load
- Faulty throttle body
DIAGNOSIS STEPS
- Inspect/clean the throttle body
- Smoke-test the intake
- Check idle live data and adaptation
RELATED PARTS
- Throttle body (drive-by-wire)