1997 Isuzu Trooper LSFACTORY OEM SERVICE PROCEDURE

Retrieving Codes

NOTE: Codes can be retrieved using a scan tester. Trouble codes are referred to as DTCs.
  1. Code retrieval starts with diagnostic circuit check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK  . MIL will come on when ignition is on and engine is not running. When engine is started, MIL should go off. If light remains on while engine is running, a DTC is present.
  2. If light does not come on with ignition on and engine off, inspect MIL circuit before continuing. If MIL fails to operate, see ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK  .
  3. To retrieve codes, install scan tool. Select MIL dash lamp control and command the MIL OFF. Ensure MIL light is off and attempt to start engine. If vehicle does not start, go to vehicle NO-START tests. See appropriate BASIC DIAGNOSTIC PROCEDURES article.
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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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