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.
1990 Suzuki SamuraiFACTORY OEM SERVICE PROCEDURE
Idle Speed Control (ISC) Solenoid (Samurai, Swift)
- Turn ignition off. Disconnect electrical connector from ISC solenoid. The ISC solenoid is located on right side of engine, near valve cover.
- Using ohmmeter, check resistance between ISC solenoid terminals. Resistance should be 30-33 ohms. Replace ISC solenoid if defective.
- Warm engine to normal operating temperature. With running and electrical connector removed from ISC solenoid, disconnect ISC solenoid hose from lower port on ISC solenoid.
- No air should be drawn into the hose. Connect battery voltage to ISC solenoid terminals. Air should now be drawn into the hose. Replace ISC solenoid if defective. Reinstall hose.
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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