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 MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 24 (ENGINE CONTROLS - BASIC TESTING - 2.2L)DIAGNOSTIC CIRCUIT CHECKA-1, MALFUNCTION INDICATOR LIGHT (MIL) INOPERATIVE
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
A-1, Malfunction Indicator Light (Mil) Inoperative
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION A-1, Malfunction Indicator Light (Mil) Inoperative
WARNING: This page is about a different car, the 1995 GMC Sonoma and 1995 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- If MIL does not illuminate with ignition on and engine off, attempt to start engine. If engine starts, go to step 3). If engine does not start, check fusible links at battery. Also check PCM fuse. If fusible links or PCM fuse are blown, repair short to ground.
- If fusible links and PCM fuse are okay, turn ignition on and check power circuits to PCM, including keep-alive memory and ignition feed. See appropriate WIRING DIAGRAM in the WIRING DIAGRAMS section for power terminal identification. If power to PCM power terminals is not available, check for open in power circuits. If power to PCM power terminals is available, check for poor PCM ground circuits. If circuits are okay, replace faulty PCM.
- Turn ignition off. Disconnect PCM connectors. Turn ignition on, and connect PCM MIL driver terminal to ground using a test light. See See appropriate WIRING DIAGRAM in the WIRING DIAGRAMS section for power terminal identification.
- If MIL is now on, repair MIL driver terminal connections at PCM, or replace faulty PCM. If MIL stays off when test light is used to ground MIL driver terminal, check for blown instrument panel fuse, faulty bulb, open in MIL driver circuit between PCM and bulb, short in driver circuit to voltage or open in ignition feed to MIL.
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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.