1996 Isuzu Trooper S, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Controls - System/Component Tests: Introduction

Before testing separate components or systems, perform procedures in BASIC TESTING article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in appropriate (if more than one) TESTS W/CODES article.

NOTE: Testing individual components does not isolate shorts or open circuits. 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 shorted or open wiring harness.
CHART REFERENCE

System Or Component Diagnostic Information Location
Malfunction Indicator Light See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING article.
DLC & MIL On Steady See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING article.
No Scan Tool Data See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING article.
No-Start Diagnosis See ENGINE CRANKS BUT WILL NOT RUN in BASIC TESTING article.
Injector Circuit Diagnosis See FUEL SYSTEM DIAGNOSIS in BASIC TESTING article.
Fuel Pump Relay See FUEL PUMP RELAY TESTING in BASIC TESTING article.
Fuel System Diagnosis See FUEL SYSTEM DIAGNOSIS in BASIC TESTING article.
MAP Sensor See ENGINE SENSORS & SWITCHES  .
IAC Motor See IDLE CONTROL SYSTEM  under FUEL SYSTEM.
Fuel Injector Balance Test See FUEL CONTROL.
Fuel Evaporation Control See EMISSION SYSTEMS & SUB-SYSTEMS  .
Ignition Control Circuit See IGNITION SYSTEM in THEORY/OPERATION article.
ESC Ignition Check See IGNITION SYSTEM in THEORY/OPERATION article.
EGR System See EMISSION SYSTEMS & SUB-SYSTEMS  .
Torque Converter Clutch See MISCELLANEOUS PCM CONTROLS  .
Manual Transmission Shift Lights See MISCELLANEOUS PCM CONTROLS  .
A/C Clutch Control See MISCELLANEOUS PCM CONTROLS  .
Factory Service Tools

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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.

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