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.
1994 Hyundai Excel GL, StandardFACTORY OEM SERVICE PROCEDURE
Idle Switch
- The idle switch is incorporated in the idle speed control position sensor. Ensure switch is adjusted correctly. See ON-VEHICLE ADJUSTMENTS article. Disconnect idle switch connector. Using ohmmeter, check continuity between terminal No. 3 (Yellow/Green wire) and ground. See Figure and Figure .
- With accelerator pedal depressed, continuity should not exist. With accelerator pedal released, continuity should exist. If continuity is not as specified, replace idle switch.
- Measure power supply voltage from ECM to idle switch. Turn ignition on. Using DVOM, measure voltage between idle switch harness connector terminal No. 3 (Yellow/Green wire) and vehicle ground. Voltage should be 4 volts or more. If voltage is not within specification, turn ignition off.
- Disconnect ECM harness connector. Connect jumper wire between vehicle ground and terminal No. 7 (24-pin connector) on Federal models, terminal No. 17 (22-pin connector) on California models. See Figure . Using ohmmeter, check resistance between idle switch harness connector terminal No. 3 (Yellow/Green wire) and vehicle ground.
- If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, substitute ECM with known good unit and retest.
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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