FixVault

Unstable idling

Inspection Procedure Possible Cause
  1. Inspect fuel pressure
  2. Inspect injector
  3. Inspect long-term fuel trim and short-term fuel trim
  4. Inspect idle speed control system (Check the DTC)
  5. Inspect and test Electronic Throttle Control (ETC) module
  6. Inspect Engine Coolant Temperature Sensor (ECTS) and circuit (Check the DTC)
  • Check the DTC
  • Low fuel pressure
  • Intake air leakage
  • Contaminated fuel
  • Weak sparks when ignited