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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )
1990 Chevrolet Lumina APV V6-191 3.1L
A L L Diagnostic Trouble Codes ( DTC )
1990 Chevrolet Lumina APV V6-191 3.1LSECTION A L L Diagnostic Trouble Codes ( DTC )
Testing and Inspection- Manufacturer Code Charts
- Related Tests, Information and Procedures
- A Charts
- C Charts
- Chart C-1A Park/Neutral Switch Diagnosis
- Chart C-1B Crank Signal Diagnosis
- Chart C-1D Manifold Absolute Pressure (MAP) Output Check
- Chart C-2C Idle Air Control (IAC) System Check
- Chart C-4B Ignition System Check
- Chart C-5 Electronic Spark Control (ESC) Check
- Chart C-7 EGR System Check
- Chart C-8 Torque Converter Clutch (TCC) Diagnosis
- Chart C-10 A/C Clutch Control Circuit Diagnosis
- Chart C-12 Coolant Fan Control Circuit
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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.