2002 Isuzu Trooper LS, 4WDFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Turn ignition on. Install scan tool. Start and idle engine. Select DTC INFO on scan tool. If scan tool indicates DTC P1636 failed, go to next step. If scan tool indicates DTC P1636 did not fail, see DIAGNOSTIC AIDS .
  3. Using scan tool, clear DTC P1636. Start and idle engine. Select DTC INFO. If scan tool indicates DTC P1625 failed, go to next step. If scan tool indicates DTC P1636 did not fail, see DIAGNOSTIC AIDS .
  4. Check vehicle for aftermarket electronic devices, such as phones, alarms, etc. If an aftermarket device is incorrectly installed PCM may detect a false sensor reading. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
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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