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Accelerator Pedal or Lever Idle Validation Circuit – Data Erratic, Intermittent, or Incorrect
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 431 PID: S230 SPN: 558 FMI: 2/2 LAMP: Amber SRT: |
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
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Circuit Description
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 switch return is a shared return with other OEM cab switches.
Component Location
The integrated sensor switch (ISS) is located on the accelerator pedal or lever assembly.
Shop Talk
- This fault code is usually caused by an open circuit on either the idle validation on-idle or off-idle signal circuit, a loose connection, uncalibrated accelerator pedal or lever assembly, or miswired idle validation switch.
- The integrated sensor switch (ISS) has a different internal resistance specification (125 ohms) than the nonintegrated sensor switch (NISS).
- 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.
Refer to Troubleshooting Fault Code t05-431
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