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 MANUALSCHEVROLET2000CAVALIER BASE, 2D COUPE, AUTOMATIC, 4T40E/MN4REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - BASIC DIAGNOSTIC PROCEDURESNO START DIAGNOSISNO START - ENGINE CRANKS OKAY (3.0L - SATURN)IGNITION SYSTEM
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4
Ignition System
2000 Chevrolet Cavalier Base, 2D Coupe, Automatic, 4T40E/MN4SECTION Ignition System
- If spark is not present at a specific cylinder, go to next step. If spark is not present at all 3 cylinders at a specific ignition coil, go to step 4 . If spark is not present at all, go to step 6 .
- Disconnect appropriate ignition control module harness connector. Connect test light between battery positive terminal and ignition coil control circuit in question. Using scan tool, command appropriate ignition coil on. If test light does not illuminate, go to next step. If test light flashes, terminal connections or ignition control module is faulty. If test light remains illuminated, ignition coil control circuit is shorted to ground, or ECM is faulty.
- Connect test light between ground and ignition coil control circuit in question. If test light illuminates, control circuit is shorted to voltage. If test light does not illuminate, control circuit is open, or terminal connections or ECM is faulty.
- Turn ignition off. Disconnect appropriate ignition control module harness connector. Turn ignition on. Connect test light between ignition control module ignition feed circuit and ignition control module ground circuit at ignition control module harness connector. If test light illuminates, go to next step. If test light does not illuminate, repair open in ignition feed circuit.
- Connect test light between engine ground circuit at ignition control module harness connector and battery positive terminal. If test light illuminates, terminal connections or ignition control module are faulty. If test light does not illuminate, repair open in engine ground circuit.
- Engine ground circuit or IGN fuse (15-amp) is faulty. If fuse is at fault and continues to blow, an ignition control module is shorted to ground. Repair as necessary.
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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.