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 MANUALSHYUNDAI1990EXCEL BASE, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMISC SERVO STEPPER MOTOR (3.0L)
1990 Hyundai Excel Base, 4D Sedan, Standard
ISC Servo Stepper Motor (3.0L)
1990 Hyundai Excel Base, 4D Sedan, StandardSECTION ISC Servo Stepper Motor (3.0L)
- Measure resistance between terminals No. 2 and No. 3, then No. 2 and No. 5. The resistance should be 28-33 ohms. Measure resistance between terminals No. 5 and No. 4, then No. 5 and 6. Resistance should be 28-33 ohms. See Fig 1 .
- To check stepper motor operation, remove 6-terminal ISC stepper motor connector. Apply approximately 6 volts (from a separate power supply) to ISC motor terminals No. 2 and No. 5. Connect negative lead of 6-volt power supply to terminals No. 1 and No. 4, then No. 3 and No. 4, then No. 3 and No. 6, and, finally, No. 1 and No. 6. If stepper motor moves as voltage is applied to each of the 2 terminals, the stepper motor is operating correctly.
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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.