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Home >> Isuzu >> 2002 >> Axiom Base, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.2L >> Self-Diagnostic System >> Electric Throttle Control System Check >> Test Description
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Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

  1. 2

    In this step visually and physically inspect damage to throttle valve assembly.
  2. 3

    In this step visually and physically inspect damage to accelerator pedal assembly.
  3. 5

    Check throttle valve and throttle valve motor resistance. Check TPS resistance. See THROTTLE POSITION SENSOR table.
    THROTTLE POSITION SENSOR

    TPS No.: Measure Between Pins Specification (Ohms)
    Throttle Position Sensor No. 1
    No. 1 (Green wire) & No. 5 (Red wire) 1000-7000
    No. 1 (Green wire) & No. 6 (Blue wire) (1)
    Throttle Position Sensor No. 2
    No. 4 (Green/White wire) & No. 8 (Red/White wire) 1000-7000
    No. 4 (Green/White wire) & No. 7 (Blue/White wire) (1)
    (1) Resistance should change from .3-100 ohms as throttle is moved from closed throttle to wide open throttle.
  4. 7

    Check Accelerator Pedal Sensor (APS) resistance. See ACCELERATOR POSITION SENSOR table.
    ACCELERATOR POSITION SENSOR

    APS No.: Measure Between Pins Specification (Ohms)
    APS No. 1
    No. 10 (Black wire) & No. 4 (Red wire) 4-6
    No. 4 (Red wire) & No. 5 (White wire) (1)
    APS No. 2
    No. 3 (Blue wire) & No. 8 (Green wire) 4-6
    No. 3 (Blue wire) & No. 9 (Yellow wire) (1)
    APS No. 3
    No. 1 (Orange wire) & No. 7 (Orange/Blue wire) 4-6
    No. 6 (Blue/Green wire) & No. 7 (Orange/Blue wire) (1)
    (1) Resistance should change smoothly and steadily as accelerator pedal is pressed.
  5. 10

    This step checks for electronic throttle control software DTC errors.
  6. 11

    This step checks for electronic throttle control software DTC errors.