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.
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HOMESERVICE MANUALSHYUNDAI1994EXCEL BASE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESDIAGNOSTIC TESTSCODE 15 - IDLE SPEED CONTROL MOTOR POSITION SENSOR FAILUREHARNESS INSPECTION
1994 Hyundai Excel Base, Standard
Harness Inspection
1994 Hyundai Excel Base, StandardSECTION Harness Inspection
- Measure power supply voltage to sensor. Disconnect Motor Position Sensor (MPS) harness connector. Turn ignition on. Using DVOM, measure voltage between MPS harness connector terminals No. 1 and 5 (Green/Red wires) and vehicle ground. Voltage should be 4.8-5.2 volts. If voltage is not within specification, check continuity of circuit.
- Turn ignition off. Disconnect ECM harness connector. Connect jumper wire between ECM harness connector terminal No. 1 (Green/Red wire, 22-pin connector) and vehicle ground. See Figure . Using ohmmeter, check resistance between MPS harness connector terminals No. 1 and 5 (Green/Red and Green/Yellow wires) 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.
- Check continuity of ground circuit. Using ohmmeter, check resistance between MPS harness connector terminal No. 4 (Black wire) and vehicle ground. If continuity does not exist, inspect and repair circuit as needed.
- Check continuity of input circuit between MPS and ECM. Connect jumper between ECM harness connector terminal No. 22 (Light Green wire, 26-pin connector) and vehicle ground. Using ohmmeter, check resistance between MPS harness connector terminal No. 2 (Light Green wire) and vehicle ground. If continuity does not exist, inspect and repair wire as needed.
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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.