Engine Controls - System/Component Tests: Introduction
Before testing separate components or systems, perform all procedures listed in BASIC TESTING article in this section. Since many computer-controlled and monitored components will set a diagnostic trouble code if they malfunction, it is also recommended that self-diagnosis be performed. Refer to TESTS W/CODES article in this section.
NOTE:
Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens. 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 AA - USING THIS SECTION (GENERAL HELP INFORMATION) article in this section.
A & C CHART REFERENCE
| System or Component | Diagnostic Information Location | ||||
|---|---|---|---|---|---|
| A-1 & A-2, Malfunction Indicator Light (MIL) | (1) See DIAGNOSTIC CIRCUIT CHECK | ||||
| A-3, No Start | (1) See NO START - ENGINE CRANKS OKAY | ||||
| A-5, Fuel Pump Relay | See RELAYS, SOLENOIDS & MOTORS | ||||
| A-7, Fuel System Diagnosis | (1) See BASIC FUEL SYSTEM CHECKS | ||||
| C-1, ECM/PCM Replacement Check | See ECM/PCM REPLACEMENT CHECK | ||||
| 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, Injector Balance Test | See FUEL SYSTEM | ||||
| C-2, IAC Motor | See IDLE CONTROL SYSTEM in | ||||
| C-2, ISC Motor | See IDLE CONTROL SYSTEM in | ||||
| C-3, Canister Purge System (Fuel Evaporation Control) | See EMISSION SYSTEMS & SUB-SYSTEMS | ||||
| C-4, EST Ignition Check | (1) See BASIC IGNITION SYSTEM CHECKS | ||||
| C-5, ESC Ignition Check | See IGNITION SYSTEM | ||||
| C-6, Air Injection System | See EMISSION SYSTEMS & SUB-SYSTEMS | ||||
| C-7, EGR System | See EMISSION SYSTEMS & SUB-SYSTEMS | ||||
| C-8, Torque Converter Clutch (Trans.) | See MISCELLANEOUS ECM CONTROLS | ||||
| C-8, M/T Shift Lights (Trans.) | See MISCELLANEOUS ECM CONTROLS | ||||
| C-10, A/C Clutch Control (2) | See MISCELLANEOUS ECM CONTROLS | ||||
| C-12, Electric Cooling Fan Control (2) | See MISCELLANEOUS ECM CONTROLS | ||||
| C-18, Supercharger Boost Control | See AIR INDUCTION SYSTEMS | ||||
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