Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM L3)NO. 9 FAST IDLE/RUNS ONNOTES

2006 Mazda 6 i, 4D Sedan, Automatic

No. 9 Fast Idle/Runs On: Notes

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Notes

POSSIBLE CAUSE DESCRIPTION

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

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.