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 Hyundai Excel Base, 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Power Transistor
- Remove connector from power transistor. Apply 1.5 volts (3 volts on Sonata 2.4L) between power transistor terminals No. 1 and 2. See Fig 1 & Fig 2 .
- Check continuity between terminals No. 2 and 3 with terminal No. 1 disconnected from battery, no continuity should be present. With terminal No. 1 connected to battery, there should be continuity between terminals No. 2 and 3.
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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