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Home >> Isuzu >> 2002 >> Trooper S, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1299: Electric Throttle Control Forced Engine Shutdown Mode >> Diagnostic 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. Perform ELECTRIC THROTTLE CONTROL SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing electronic throttle control system check, go to next step.
  3. Ensure engine is at an operating temperature 176°F (80°C) or more. Turn ignition on. While slowly opening throttle, observe TPS angle parameters on scan tool. See CHECKING THROTTLE POSITION SENSORS  table. Both TPS parameters should increase smoothly and evenly from closed to wide open throttle. If both TPS angle parameters display as specified, go to next step. If both TPS angle parameters do not display as specified, go to step  5.
    CHECKING THROTTLE POSITION SENSORS

    Throttle Position Sensor Specification
    Throttle Position Sensor 1
    Closed Throttle 6-12 %
    Wide Open Throttle 79-83 %
    Throttle Position Sensor 2
    Closed Throttle 88-94 %
    Wide Open Throttle 19-23 %
  4. Turn ignition on. Review and record scan tool FAILURE RECORDS data. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, monitor SPECIFIC DTC information for DTC P1295 until DTC P1295 test runs. Note result. If scan tool indicates DTC P1295 FAILED THIS IGNITION, go to step  8. If scan tool display is not as specified, see DIAGNOSTIC AIDS .
  5. Check for open or short circuit in circuits between TPS1 and TPS2 and PCM. See WIRING DIAGRAMS article. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to next step.
  6. Turn ignition on. Operate throttle lever by hand. Do not operate the accelerator pedal. Using scan tool, retrieve DTCs. If DTC P1515 or P1516 are set, go to step  8. If DTCs are not set, go to next step.
  7. Replace TPS. See REMOVAL, OVERHAUL & INSTALLATION article. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  8. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.
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