The idle validation switch is used by the Electronic Control Module (ECM) to indicate when the accelerator pedal is released (on-idle) or depressed (off-idle). The switch is adjusted at the factory to switch from on-idle to off-idle at the correct accelerator pedal position
This fault code is usually caused by a loose connection, an accelerator pedal that is not calibrated,a failed pedal assembly or Throttle position sensor.
If all wiring and sensor checks are good, replace the idle validation switch circuit wires, between the accelerator pedal and ECM, with new wires. Run the wires through or around the bulkhead without using the bulkhead connector. Test the truck with the test wires in place. If the fault clears, replace the OEM harness.
Verify that the three idle validation switch circuit wires are twisted together.
The ECM and accelerator pedal assembly must be electrically calibrated to each other for proper engine response.
The ECM and accelerator pedal assembly must be calibrated when an accelerator pedal is initially installed, replaced, when an ECM is replaced, when a new calibration is downloaded to the ECM, and when the accelerator pedal wiring is disconnected while the vehicle keyswitch "ON".
With keyswitch "ON", gradually push the accelerator to the floor and release. Depress and release the accelerator pedal three times. This procedure will recalibrate the ECM and accelerator pedal.
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