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 MANUALSCHEVROLET1999CAMARO BASE, 2D CONVERTIBLE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - SYSTEM TESTING & ENGINE COMPONENT TESTSMISCELLANEOUS CONTROLSPCM CONTROLLED GENERATOR5.7L
1999 Chevrolet Camaro Base, 2D Convertible, Automatic
Pcm Controlled Generator: 5.7L
1999 Chevrolet Camaro Base, 2D Convertible, AutomaticSECTION 5.7L
- If On-Board Diagnostic (OBD) system check has been performed, go to next step. If On-Board Diagnostic (OBD) system check has not been performed, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article.
- Install scan tool. Start engine. Using scan tool, monitor generator terminal "L" terminal. If scan tool displays generator terminal "L" active, perform DTC P1637 test. See appropriate SELF-DIAGNOSTICS article. If scan tool does not display generator terminal "L" active, go to next step.
- Using DVOM, measure voltage at battery. If voltage is 13-15 volts, check for low battery charge. A shorted output diode, malfunctioning regulator, an open or shorted rotor, or an open sense lead in generator may cause a low battery charge. If voltage is not 13-15 volts, go to next step.
- Using test light connected to ground, probe generator battery feed circuit. If test light illuminates, go to next step. If test light does not illuminate, check charging system.
- Disconnect generator harness connector. Start engine. Using DVOM, measure voltage between ground and generator harness connector terminal "B" (Brown wire). If voltage is 10 volts or more, go to step 10. If voltage is less than 10 volts, go to next step.
- Turn ignition off. Disconnect PCM harness connector C2. Using DVOM, check for continuity between generator harness connector terminal "B" (Brown wire) and PCM harness connector C2 terminal No. 15 (Brown wire). If continuity exists, go to step 8. If continuity does not exist, go to next step.
- Repair open or high resistance in generator circuit (Brown wire).
- Check for poor connection at PCM. Repair as necessary. If connection is okay, go to next step.
- Replace PCM.
- Check for poor connection at generator. Repair as necessary. If connection is okay, go to next step.
- Replace generator.
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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.