A & C Chart Reference Table

NOTE: The following table provides the location of commonly used diagnostic information. These former "A" and "C" charts are now written in text and inserted into the appropriate location in the new Engine Performance workflow. To familiarize yourself with the Engine Performance workflow, see HOW TO USE THE ENGINE PERFORMANCE SECTION in this section.

GENERAL MOTORS A & C CHART REFERENCE

System Or Component

Diagnostic Information Location

A-1 & A-2, MALFUNCTION INDICATOR LIGHT (MIL)

See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK

A-2, DLC Diagnosis

See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK

A-3, No Start

See NO START - ENGINE CRANKS OKAY

A-4, No Scan Tool Data

See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK

A-5, Fuel Pump Relay

See FUEL SYSTEM in SYSTEM/COMPONENT TESTS article

A-7, Fuel System Diagnosis

See BASIC FUEL SYSTEM CHECKS (A-7)

C-1, PCM Replacement Check

See PCM REPLACEMENT CHECK

C-1, MAP Sensor

See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS article

C-1, Power Steering Pressure Switch

See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS article

C-1, Park/Neutral Position Switch

See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS article

C-2, Injector Balance Test

See FUEL SYSTEM in SYSTEM/COMPONENT TESTS article

C-2, Injector Coil Test

See FUEL SYSTEM in SYSTEM/COMPONENT TESTS article

C-2, Injector Leak Test

See FUEL SYSTEM in SYSTEM/COMPONENT TESTS article

C-2, IAC Motor

See IDLE CONTROL SYSTEM in SYSTEM/COMPONENT TESTS article

C-3, Canister Purge System (Fuel Evap. Control)

See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article

C-5, KS Ignition Check

See IGNITION SYSTEM in SYSTEM/COMPONENT TESTS article

C-6, Air Injection System

See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article

C-7, EGR System

See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM/COMPONENT TESTS article

C-8, Manual Transmission Shift Lights (Trans.)

See MISCELLANEOUS CONTROLS in SYSTEM/COMPONENT TESTS article

C-8, Torque Converter Clutch (Trans.)

⁽¹⁾ See MISCELLANEOUS CONTROLS in SYSTEM/COMPONENT TESTS article

C-10, A/C Clutch Control

⁽²⁾ See MISCELLANEOUS CONTROLS in SYSTEM/COMPONENT TESTS article

C-12, Electric Cooling Fan Control

⁽²⁾ See MISCELLANEOUS CONTROLS in SYSTEM/COMPONENT TESTS article

C-16, Engine Coolant Level Switch

See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS article

C-16, Fuel Pump/Oil Pressure Switch

See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS article

C-16, Oil Level Switch

See ENGINE SENSORS & SWITCHES in SYSTEM/COMPONENT TESTS article

C-16, PCM Controlled Warning Lights

See MISCELLANEOUS CONTROLS in SYSTEM/COMPONENT TESTS article

⁽¹⁾	Covered in entirety in appropriate AUTO TRANS DIAGNOSIS article.

⁽²⁾	Covered in entirety in A/C-HEATER SYSTEM article in the AIR CONDITIONING & HEAT section.

NOTE: Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure.