SPN 558 - FMI 2 (Fault Code 431)
SPN 558 - FMI 2 (Fault Code: 431)
SPN558 FMI2
CODES:
Fault Code: 431
PID(P), SID(S): S230
SPN: 558
FMI: 2/2
Lamp: AMBER
SRT:
REASON: Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent, or Incorrect. Voltage detected simultaneously on both idle validation and off-idle validation switches.
EFFECT: Engine will ONLY idle.
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.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes: The ECM detects a signal voltage detected simultaneously on both the idle validation and off-idle validation switches. Voltage will only be detected on one of the circuits.
Action Taken When the Fault Code is Active:
• The ECM will illuminate the red STOP ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE light immediately after the diagnostic runs and passes.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
Read More:
SPN 97 - FMI 4 (Fault Code 429)
SPN 558 - FMI 13 (Fault Code 432)
Blog.Teknisi
SPN558 FMI2
 |
| Accelerator Pedal or Lever Idle Validation Circuit |
CODES:
Fault Code: 431
PID(P), SID(S): S230
SPN: 558
FMI: 2/2
Lamp: AMBER
SRT:
REASON: Accelerator Pedal or Lever Idle Validation Circuit - Data Erratic, Intermittent, or Incorrect. Voltage detected simultaneously on both idle validation and off-idle validation switches.
EFFECT: Engine will ONLY idle.
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.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes: The ECM detects a signal voltage detected simultaneously on both the idle validation and off-idle validation switches. Voltage will only be detected on one of the circuits.
Action Taken When the Fault Code is Active:
• The ECM will illuminate the red STOP ENGINE light immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE light immediately after the diagnostic runs and passes.
Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
- This fault code is usually caused by an open circuit on either the idle validation on-idle or the idle validation off-idle signal circuit, a loose connection, uncalibrated accelerator pedal or lever assembly, or miswired idle validation switch.
- When installing a new accelerator pedal or lever assembly, it must be calibrated before operating the engine. To calibrate the new accelerator pedal or lever assembly, turn the keyswitch to the ON position and fully depress and release the pedal or lever three times.
Read More:
SPN 97 - FMI 4 (Fault Code 429)
SPN 558 - FMI 13 (Fault Code 432)
Blog.Teknisi
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