HOW TO CHECKING THE ACCELERATOR PEDAL SENSOR CALIBRATION?

POSSIBLE CAUSES

  • MIS-WIRED APPS
  • VOLTAGE NOT CHANGING DURING SWEEP
  • THROTTLE PEDAL NOT MOVING FREELY
  • APPS

DIAGNOSTIC PROCEDURE

NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

  1. Turn the ignition off. Remove the APPS cover. Inspect both APPS connector and ECM for proper wiring. Are both connectors wired correctly?
    Yes –> Go To 2
    No –> Repair mis-wired APPS connector at APPS or ECM. Perform POWERTRAIN VERIFICATION TEST VER – 1 (DIESEL).
  2. Ignition on, engine not running. Remove APPS cover. With the DRBIII® in Sensors, read the APPS voltage while sweeping the APPS from the lower to the upper stops. Does voltage vary between less than 1.0 volt (closed) and more than 3.0 volts (open)?
    Yes –> Test complete. No trouble found. Perform POWERTRAIN VERIFICATION TEST VER – 1 (DIESEL).
    No –> Go To 3
  3. Ignition on, engine not running. Remove APPS cover. Look for proper Throttle operation.
    Does the Throttle Pedal move freely between the upper and lower stops?
    Yes –> Replace the APPS. Perform POWERTRAIN VERIFICATION TEST VER – 1 (DIESEL).
    No –> Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER – 1 (DIESEL).
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