Testing and Inspection
- Diagnostic Trouble Code Descriptions
- Manufacturer Code Charts
- Related Tests, Information and Procedures
- A Charts
- C Charts
- Chart C-1 ECM Quad Driver Check
- Chart C-1A Park/Neutral Switch Diagnosis
- Chart C-2A Injector Balance Test
- Chart C-2B Idle Air Control (IAC) Valve Check
- Chart C-3 Canister Purge Check
- Chart C-4A Ignition System Check
- Chart C-5 Electronic Spark Control (ESC) Check
- Chart C-6 Air Management Check (PEDES Valve)
- Chart C-7A Exhaust Gas Recirculation (EGR) Check
- Chart C-8A Torque Converter Clutch (TCC) Electrical Diagnosis
- Chart C-12 Engine Cooling Fan Circuit Diagnosis
A L L Diagnostic Trouble Codes ( DTC )
Need a step-by-step guide?
Get an AI-powered repair guide with parts lists, cost estimates, and clear instructions for your 1987 Pontiac.