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No. 9 Fast Idle/Runs On: Notes

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DESCRIPTION & POSSIBLE CAUSE

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