Engine Controls - System/Component Tests - 5.7L: Introduction
Before testing separate components or systems, perform all procedures listed in BASIC TESTING article in the ENGINE PERFORMANCE 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. See appropriate TESTS W/CODES - 5.7L article in the ENGINE PERFORMANCE 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 - HOW TO USE THE ENGINE PERFORMANCE SECTION article in GENERAL INFORMATION section.
GENERAL MOTORS 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 FUEL SYSTEM in this article | ||||
| A-7, Fuel System Diagnosis | (1) See BASIC FUEL SYSTEM CHECKS | ||||
| C-1, ECM/PCM Replacement Check | (1) See ECM/PCM REPLACEMENT CHECK | ||||
| C-1, MAP Sensor | See ENGINE SENSORS & SWITCHES in this article | ||||
| C-1, Power Steering Pressure Switch | See ENGINE SENSORS & SWITCHES in this article | ||||
| C-1, Park/Neutral Position Switch | See ENGINE SENSORS & SWITCHES in this article | ||||
| C-2, Injector Balance Test | See FUEL SYSTEM in this article | ||||
| C-2, Injector Coil Test | See FUEL SYSTEM in this article | ||||
| C-2, Injector Leak Test | See FUEL SYSTEM in this article | ||||
| C-2, IAC Motor | See IDLE CONTROL SYSTEM in this article | ||||
| C-2, ISC Motor | See IDLE CONTROL SYSTEM in this article | ||||
| C-3, Canister Purge System (Fuel Evaporation Control) | See EMISSION SYSTEMS & SUB-SYSTEMS in this article | ||||
| C-4, EST Ignition Check | See BASIC IGNITION SYSTEM CHECKS in this article | ||||
| C-5, KS Ignition Check | See IGNITION SYSTEM in this article | ||||
| C-6, Air Injection System | See EMISSION SYSTEMS & SUB-SYSTEMS in this article | ||||
| C-7, EGR System | See EMISSION SYSTEMS & SUB-SYSTEMS in this article | ||||
| C-8, Manual Transmission Shift Lights (Transmission) | See MISCELLANEOUS CONTROLS in this article | ||||
| C-8, Torque Converter Clutch (Transmission) | (2) See MISCELLANEOUS CONTROLS in this article | ||||
| C-10, A/C Clutch Control | See MISCELLANEOUS CONTROLS in this article | ||||
| C-12, Electric Cooling Fan Control | See MISCELLANEOUS CONTROLS in this article | ||||
| C-16, Engine Coolant Level Switch | See ENGINE SENSORS & SWITCHES in this article | ||||
| C-16, Fuel Pump/Oil Pressure Switch | See ENGINE SENSORS & SWITCHES in this article | ||||
| C-16, Oil Level Switch | See ENGINE SENSORS & SWITCHES in this article | ||||
| C-18, Supercharger Boost Control | See AIR INDUCTION SYSTEMS in this article | ||||
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