Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent or Incorrect
|Fault Code: 431
Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent or Incorrect. Voltage detected simultaneously on both idle validation and off-idle validation switches.
Automotive: Engine will only idle.
Marine: Severe derate in engine speed. Limp home capability only.
Accelerator Pedal or Lever Idle Validation Circuit
The idle validation switch is used by the electronic control module (ECM) to indicate when the accelerator pedal or lever 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 or lever position.
The solid state sensor switch (SSS) is located on the accelerator pedal or lever assembly.
- This fault code is usually caused by an open circuit on either the idle validation on-idle or off-idle signal circuits, a loose connection, uncalibrated accelerator pedal or lever assembly, or miswired idle validation switch.
- Since the solid state sensor switch (SSS) uses an integrated circuit to output idle and off-idle signals, the internal resistance can not be checked with a multimeter as it is for the integrated sensor switch and nonintegrated sensor switch.
- When installing a new accelerator pedal or lever assembly, it must be calibrated before operating the engine. To calibrate, turn the keyswitch to the ON position and fully depress and release the pedal three times.