SPN 558 - FMI 2 (Fault Code 431)
Tuesday, July 10, 2018
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SPN558 FMI2
Accelerator Pedal or Lever Idle Validation Switch - Data Erratic, Intermittent, or Incorrect
CODES:
Fault Code: 431
PID(P), SID(S): S230
SPN: 558
FMI: 2/2
Lamp: Amber
REASON: Voltage detected simultaneously on both the on-idle signal and off-idle signal circuits.
EFFECT: Engine will only idle.
Circuit Description:
The accelerator pedal or lever 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. The idle validation switch return is a shared return with other original equipment manufacturer (OEM) cab switches.
Component Location:
The idle validation switch is located on the accelerator pedal assembly.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the on-idle and off-idle signal circuits are in the same state simultaneously.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
-When installing a new accelerator pedal 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.
-Possible causes of this fault code include:
-An open circuit on the accelerator pedal or lever idle validation switch on signal
-An open circuit on the accelerator pedal or lever idle validation switch off signal
-An uncalibrated accelerator pedal assembly
Read More:
SPN 102 - FMI 2 (Fault Code 433)
SPN 558 - FMI 13 (Fault Code 432)
Blog.Teknisi
Accelerator Pedal or Lever Idle Validation Switch - Data Erratic, Intermittent, or Incorrect
 |
| Accelerator Pedal or Lever Idle Validation Circuit |
CODES:
Fault Code: 431
PID(P), SID(S): S230
SPN: 558
FMI: 2/2
Lamp: Amber
REASON: Voltage detected simultaneously on both the on-idle signal and off-idle signal circuits.
EFFECT: Engine will only idle.
Circuit Description:
The accelerator pedal or lever 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. The idle validation switch return is a shared return with other original equipment manufacturer (OEM) cab switches.
Component Location:
The idle validation switch is located on the accelerator pedal assembly.
Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the on-idle and off-idle signal circuits are in the same state simultaneously.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.
Shop Talk:
-When installing a new accelerator pedal 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.
-Possible causes of this fault code include:
-An open circuit on the accelerator pedal or lever idle validation switch on signal
-An open circuit on the accelerator pedal or lever idle validation switch off signal
-An uncalibrated accelerator pedal assembly
Read More:
SPN 102 - FMI 2 (Fault Code 433)
SPN 558 - FMI 13 (Fault Code 432)
Blog.Teknisi
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