SPN 558 - FMI 4 (Fault Code 551)
Wednesday, July 04, 2018
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SPN558 FMI4
Accelerator Pedal or Lever Idle Validation Switch Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 551
PID(P), SID(S): S230
SPN: 558
FMI: 4/4
Lamp: Amber
REASON: No voltage detected simultaneously on both the idle validation off-idle and idle-signal pins of the OEM interface harness.
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 accelerator pedal or lever position sensor is mounted to 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 Low voltage on both idle and off-idle signals.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
The engine will only idle.
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.
• It is necessary to use the "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent to clear this fault.
Shop Talk:
Possible causes of this fault code include:
-Malfunctioning accelerator pedal or lever position sensor.
-Incorrect ECM software for this application
-Damaged wiring harness
Read More:
SPN 157 - FMI 16 (Fault Code 553)
SPN 157 - FMI 18 (Fault Code 559)
Blog.Teknisi
Accelerator Pedal or Lever Idle Validation Switch Circuit - Voltage Below Normal or Shorted to Low Source
 |
| Accelerator Pedal or Lever Idle Validation Circuit |
CODES:
Fault Code: 551
PID(P), SID(S): S230
SPN: 558
FMI: 4/4
Lamp: Amber
REASON: No voltage detected simultaneously on both the idle validation off-idle and idle-signal pins of the OEM interface harness.
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 accelerator pedal or lever position sensor is mounted to 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 Low voltage on both idle and off-idle signals.
Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
The engine will only idle.
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.
• It is necessary to use the "Reset All Faults" command in the recommended Cummins® electronic service tool or equivalent to clear this fault.
Shop Talk:
Possible causes of this fault code include:
-Malfunctioning accelerator pedal or lever position sensor.
-Incorrect ECM software for this application
-Damaged wiring harness
Read More:
SPN 157 - FMI 16 (Fault Code 553)
SPN 157 - FMI 18 (Fault Code 559)
Blog.Teknisi
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