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Home >> Mazda >> 2005 >> 3 i, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine] >> No.9 Fast Idle/Runs On >> Notes
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No.9 Fast Idle/Runs On: Notes

POSSIBLE CAUSES OF FAST IDLE/RUNS ON

9 FAST IDLE/RUNS ON
DESCRIPTION 
  • The engine speed continues at fast idle after warm-up.
  • The engine runs after the ignition switch is turned off.
POSSIBLE CAUSE 
  • ECT sensor malfunction
  • Air leakage from intake-air system
  • Throttle body malfunction
  • Accelerator pedal position sensor misadjustment
  • Cruise control system operation improperly
  • Improper load signal input
  • Improper operation of electronic throttle control system