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 In BASIC TESTING Article

A3, No Start

See NO START - ENGINE CRANKS OKAY In BASIC TESTING Article

A5, Fuel Pump Relay

See MOTORS, RELAYS & SOLENOIDS In This Article

A7, Fuel System Diagnosis

See BASIC FUEL SYSTEM CHECKS In BASIC TESTING Article

C1, MAP Sensor

See ENGINE SENSORS & SWITCHES In This Article

C1, Power Steering Pressure Switch

See ENGINE SENSORS & SWITCHES In This Article

C1, Park/Neutral Switch

See ENGINE SENSORS & SWITCHES In This Article

C2, Injector Balance Test

See FUEL CONTROL In This Article

C2, IAC Motor

See IDLE CONTROL SYSTEM In This Article

C2, ISC Motor

See IDLE CONTROL SYSTEM In This Article

C3, Canister Purge System

See EMISSION SYSTEMS & SUB-SYSTEMS In This Article

C4, EST Ignition Check

See BASIC IGNITION SYSTEM CHECKS In BASIC TESTING Article

C4, DIS Ignition "Misfire"

See DIS MISFIRE - 3.1L (VIN T) "W" BODY - C4F Chart In This Article.

C5, ESC Ignition Check

See IGNITION SYSTEM In This Article

C6, Air Injection System

See EMISSION SYSTEMS & SUB-SYSTEMS In This Article

C7, EGR System

See EMISSION SYSTEMS & SUB-SYSTEMS In This Article

C8, Torque Converter Clutch

See MISCELLANEOUS ECM CONTROLS In This Article

C8, Manual Trans. Shift Lights

See MISCELLANEOUS ECM CONTROLS In This Article

C10, A/C Clutch Control

⁽¹⁾ See MISCELLANEOUS ECM CONTROLS In This Article

C12, Electric Cooling Fan Control

⁽¹⁾ See MISCELLANEOUS ECM CONTROLS In This Article

⁽¹⁾	Also see ENGINE COOLING FAN article in the ENGINE COOLING section.