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 MANUALSCHEVROLET1990STEP VAN 6.2 J, AUTOMATIC, 3L80-HD/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSFUEL SYSTEM (DIESEL)INHIBIT SWITCH (BLACK CAP)
1990 Chevrolet Step Van 6.2 J, Automatic, 3L80-HD/M40
Inhibit Switch (Black Cap)
1990 Chevrolet Step Van 6.2 J, Automatic, 3L80-HD/M40SECTION Inhibit Switch (Black Cap)
- Remove connector from inhibit switch when engine temperature is below 100°F (38°C). Inhibit switch is located in water crossover near front of engine. Set ohmmeter on low range. Test across switch terminals. Switch should be closed (a reading of less than 1.0 ohm on meter.)
- Test terminals to ground with a test light or ohmmeter on high range. Light should be off. Meter should show greater than 1.0 megohm. Replace switch if results are not as specified.
- Disconnect plug from switch terminals when engine is above 125°F (52°C). Change ohmmeter setting to highest scale or use a self-powered test light. Test across switch terminals. Test from each terminal to ground. Switch should be open (test light off or high ohm reading of greater than 1.0 megohm on meter). Replace switch if it is closed. When installing replacement switch, tighten to 17 ft. lbs. (23 N.m).
RENDER: 1.0x
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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.