SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1993SPORTVAN G20, 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSINTRODUCTION
1993 Chevrolet Sportvan G20, 5.7 K

Engine Controls - System/Component Tests: Introduction

1993 Chevrolet Sportvan G20, 5.7 KSECTION Introduction

Before testing separate components or systems, perform procedures in BASIC TESTING article in this section. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in appropriate 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 and refer to WIRING DIAGRAMS to isolate wiring harness shorts or opens.

IMPORTANT: 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 GENERAL INFORMATION.

GENERAL MOTORS "A" & "C" CHART REFERENCE

System or Component Diagnostic Information Location
DIAGNOSTIC CIRCUIT CHECK See DIAGNOSTIC CIRCUIT CHECK in BASIC DIAGNOSTIC PROCEDURES
A-1 & A-2, Malfunction Indicator Light (MIL) See DIAGNOSTIC CIRCUIT CHECK in BASIC DIAGNOSTIC PROCEDURES
A-3, No-Start See NO-START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES
A-5, Fuel Pump Relay See RELAYS, SOLENOIDS, MOTORS & MODULES in SYSTEM & COMPONENT TESTING
A-6 & A-7, Fuel System Diagnosis See BASIC FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES
C-1, MAP Sensor See ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING
C-1, Power Steering Pressure Switch See ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING
C-1, Park/Neutral Switch See ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING
C-2, Injector Balance Test (PFI) See FUEL CONTROL in SYSTEM & COMPONENT TESTING
C-2, IAC Motor See IDLE CONTROL SYSTEM in SYSTEM & COMPONENT TESTING
C-3, Canister Purge System See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING
C-4, EST Ignition Check See BASIC IGNITION SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES
C-5, ESC Ignition Check See IGNITION SYSTEM in SYSTEM & COMPONENT TESTING
C-6, Air Injection System See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING
C-7, EGR System See EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING
C-8, Torque Converter Clutch See MISCELLANEOUS ECM CONTROLS in SYSTEM & COMPONENT TESTING
C-8, Manual Transmission Shift Lights See MISCELLANEOUS ECM CONTROLS in SYSTEM & COMPONENT TESTING
C-10, A/C Clutch Control See MISCELLANEOUS ECM CONTROLS in SYSTEM & COMPONENT TESTING
C-12, Electric Cooling Fan Control (1) See MISCELLANEOUS ECM CONTROLS in SYSTEM & COMPONENT TESTING
(1) Covered in entirety in ENGINE COOLING article.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.