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.
1987 Toyota Camry Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Idle Speed Control (ISC) Valve
- Unplug ISC valve connector. Measure resistance between "B+" terminal and "ISC1" and "ISC2" terminals. See Fig 1. Ohmmeter reading should be 16-17 ohms. If not replace ISC valve.
- Apply battery voltage to terminal "B(1)" and terminal "B(2)" while repeatedly grounding terminals "S(1)", "S(2)", "S(6)", "S(4)" and "S(1)" in sequence to cause valve to close. See Fig 1.
- Apply battery voltage to terminals "B(1)" and "B(2)" while repeatedly grounding terminals "S(4)", "S(6)", "S(2)", "S(1)" and "S(4)" in sequence to cause valve to open. Replace valve if not operating properly.
Factory Service Tools
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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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