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 MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN PASSENGER, 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM & COMPONENT TESTSMISCELLANEOUS CONTROLSPCM CONTROLLED WARNING LIGHTS & GAUGESSHIFT LIGHT CIRCUIT DIAGNOSIS (MANUAL TRANSMISSION)
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 J
Shift Light Circuit Diagnosis (Manual Transmission)
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 JSECTION Shift Light Circuit Diagnosis (Manual Transmission)
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. Go to next step.
- Turn ignition off. Install scan tool. Turn ignition on. Using scan tool, command shift light on. If shift light illuminates, go to step 4. If shift light does not illuminate, go to next step.
- Turn ignition off. Disconnect PCM harness connector that contains shift light circuit. Turn ignition on. Connect a fused jumper wire between ground and shift light control circuit (Tan/Black wire) at PCM harness connector. If shift light illuminates, go to step 5. If shift light does not illuminate, go to step 6.
- Using scan tool, command shift light off, and then on. If shift light operates as commanded, system is okay. If shift light does not operate as commanded, go to step 8.
- Check shift light control circuit (Tan/Black wire) for poor connection at PCM. If problem exists, go to step 7. If problem does not exist, go to step 10.
- Repair open in shift light control circuit between PCM and instrument cluster. After repairs, go to step 11.
- Repair poor connection as necessary. After repairs, go to step 11.
- Turn ignition off. Disconnect PCM harness connector that contains shift light circuit. Turn ignition on. If shift light illuminates, go to next step. If shift light does not illuminate, go to step 10.
- Repair short to ground in shift light control circuit (Tan/Black wire) between PCM and instrument cluster. After repairs, go to step 11.
- Replace PCM and reprogram. Perform VTD password relearn procedure and perform crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES in GENERAL INFORMATION article. After repairs, go to next step.
- Using scan tool, clear DTCs. Start engine and let idle until normal operating temperature is obtained. Using scan tool, select DTC, and then SPECIFIC DTC. Enter the DTC number which was set. Operate vehicle under conditions for setting DTC until scan tool indicates the diagnostic ran. If scan tool indicates the diagnostic passed, go to next step. If scan tool does not indicate the diagnostic passed, go to step 2
- If scan tool does not display any DTCs, system is okay. If scan tool displays any DTCs, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
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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.