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
- INSPECT THROTTLE BODY IDLE SPEED CONTROL VALVE ASSY NOTE:
- Since the Idle Speed Control Valve (ISC valve) has an internal IC circuit which converts the ECM duty signal into the drive signal, it is impossible to check its resister value and valve operation with the valve alone.
- Clear the DTC after inspection.
HINT:
If the ISC valve system has malfunction other than valve stuck, DTC P0505 will be set.
- Operation inspection.
- Connect the ISC valve connector to the ISC valve.
- Check the valve movement when the ignition switch is turned ON.
Movement: Half open --> fully close --> fully open --> half open
HINT:
The series of the valve movement mentioned above is done within 0.5 second.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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