General Motors A & C Chart Reference
WARNING: This page does not describe the selected car, but rather 34 other vehicles, including the 1991 Pontiac Sunbird, 1991 Pontiac Grand Prix, 1991 Pontiac Grand Am, 1991 Pontiac Firebird, and 1991 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
GENERAL MOTORS A & C CHART REFERENCE
| System or Component |
Diagnostic Information Location |
| A1 & A2, "SERVICE ENGINE SOON" Light |
See DIAGNOSTIC CIRCUIT CHECK |
| A3, No Start |
See NO START - ENGINE CRANKS OKAY |
| A5, Fuel Pump Relay |
See RELAYS, SOLENOIDS & MOTORS in SYSTEM/COMPONENT TESTS |
| A7, Fuel System Diagnosis |
See BASIC FUEL SYSTEM CHECKS |
| C1, MAP Sensor |
See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS |
| C1, Power Steering Pressure Switch |
See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS |
| C1, Park/Neutral Switch |
See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS |
| C2, Injector Balance Test |
See FUEL CONTROL in SYSTEM/COMPONENT TESTS |
| C2, IAC Motor |
See IDLE CONTROL SYSTEM in SYSTEM/COMPONENT TESTS |
| C2, ISC Motor |
See IDLE CONTROL SYSTEM in SYSTEM/COMPONENT TESTS |
| C3, Canister Purge System |
See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS |
| C4F DIS Misfire |
See DIS MISFIRE - 3.1L (VIN T) "W" BODY - C4F Chart |
| C4, EST Ignition Check |
See BASIC IGNITION SYSTEM CHECKS |
| C5, ESC Ignition Check |
See IGNITION SYSTEM in in the SYSTEM/COMPONENT TESTS |
| C6, Air Injection System |
See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS |
| C7, EGR System |
See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS |
| C8, Torque Converter Clutch |
See MISCELLANEOUS ECM CONTROLS in SYSTEM/COMPONENT TESTS |
| C8, Manual Trans. Shift Lights |
See MISCELLANEOUS ECM CONTROLS in SYSTEM/COMPONENT TESTS |
| C10, A/C Clutch Control |
See MISCELLANEOUS ECM CONTROLS in SYSTEM/COMPONENT TESTS |
| C12, Electric Cooling Fan Control |
See MISCELLANEOUS ECM in SYSTEM/COMPONENT TESTS |