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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, Malfunction Indicator Light See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING article
A-2, DLC & MIL On Steady See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING article
A-2, No Scan Tool Data See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING article
A-3, No-Start Diagnosis See A-3, NO-START - ENGINE CRANKS OKAY in BASIC TESTING article
A-4, Injector Circuit Diagnosis See appropriate BASIC FUEL SYSTEM CHECKS in BASIC TESTING article
A-5, Fuel Pump Relay See RELAYS, SOLENOIDS, MOTORS & MODULES
A-6, Fuel System Diagnosis See appropriate BASIC FUEL SYSTEM CHECKS in BASIC TESTING article
A-7, Injector Balance Test See FUEL SYSTEM 
C-1, MAP Sensor See ENGINE SENSORS & SWITCHES 
C-1, Power Steering Pressure Switch See ENGINE SENSORS & SWITCHES 
C-1, Park/Neutral Switch See ENGINE SENSORS & SWITCHES 
C-2, IAC Motor See IDLE CONTROL SYSTEM  under FUEL SYSTEM
C-3, Fuel Evaporation Control See EMISSION SYSTEMS & SUB-SYSTEMS 
C-4, Ignition Control Circuit See IGNITION SYSTEM 
C-5, ESC Ignition Check See IGNITION SYSTEM 
C-7, EGR System See EMISSION SYSTEMS & SUB-SYSTEMS 
C-8, Torque Converter Clutch (1) See MISCELLANEOUS PCM/VCM CONTROLS 
C-8, Manual Transmission Shift Lights (1) See MISCELLANEOUS PCM/VCM CONTROLS 
C-10, A/C Clutch Control (2) See MISCELLANEOUS PCM/VCM CONTROLS 
C-12, Electric Cooling Fan Control (2) See MISCELLANEOUS PCM/VCM CONTROLS 
(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.
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