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.
On-Vehicle Inspection
- INSPECTION THROTTLE BODY IDLE SPEED CONTROL VALVE ASSY NOTE:
- It is impossible to check the resister value and the operation of ISC valve by itself, because the ISC valve has an IC circuit inside it, which transforms the duty signal from the ECM to the derive signal.
- After checking, erase the DTC.
- Clear the DTC after inspection.
HINT:
When the ISC valve system has malfunctions except for its adherence, DTC P0505 is detected.
- Operation inspection.
- Connect the ISC connector to the ISC valve.
- Check the ISC valve movement when the ignition switch is turned ON.
Movement: Half open --> fully close --> fully open --> half open
HINT:
ISC valve moves within 0.5 second.
Use the Manual With the Right Hardware
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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.
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