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 MANUALSCHEVROLET1996SUBURBAN K1500, 5.7 RREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTING - DIESELFUEL SYSTEMINHIBIT SWITCH (BLACK CAP)
1996 Chevrolet Suburban K1500, 5.7 R
Inhibit Switch (Black Cap)
1996 Chevrolet Suburban K1500, 5.7 RSECTION Inhibit Switch (Black Cap)
- Remove connector from inhibit switch when engine temperature is less than 100°F (38°C). Inhibit switch is located in water crossover near front of engine. Set ohmmeter on low range. Test continuity across switch terminals. Switch should be closed (a reading of less than one ohm on ohmmeter).
- Test terminals for continuity to ground with a test light to battery voltage or ohmmeter on high scale. Light should be off. Meter should show greater than one megohm resistance. Replace switch if results are not as specified.
- Disconnect plug from switch terminals when engine temperature is greater than 125°F (52°C). Change ohmmeter setting to highest scale or use a self-powered test light. Test continuity across switch terminals. Test continuity from each terminal to ground. Switch should be open (test light off or high ohm reading of greater than one megohm on ohmmeter) and resistance to ground should be infinite. Replace switch if it is closed or if shorted to ground. When installing replacement switch, tighten to 17 ft. lbs. (23 N.m).
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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.