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 MANUALSCHEVROLET1987STEP VAN P20, 7.4 W, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TBI TESTS W/CODESDIAGNOSTIC CHARTSCODE 43 - ESC (2.8L/4.3L/5.0L/5.7L) ("SCAN" DIAGNOSTICS)DIAGNOSTIC AIDS
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40
Diagnostic Aids
1987 Chevrolet Step Van P20, 7.4 W, Automatic, 400/M40SECTION Diagnostic Aids
Code 43 can be caused by a faulty connection at the knock sensor, at the ESC module, or at the ECM. Also check circuit No. 485 for possible open or short to ground.
See INTERMITTENT TROUBLE CODES in TROUBLE SHOOTING section.
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.