SPN 974 - FMI 4 (Fault Code 134)
Friday, July 20, 2018
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SPN974 FMI4
Remote Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
CODES:
Fault Code: 134
PID(P), SID(S): P372
SPN: 974
FMI: 4/4
Lamp: Red
REASON: Low voltage detected at remote accelerator position signal circuit.
EFFECT: Remote accelerator will not operate.
Circuit Description:
The remote accelerator position sensor is a potentiometer attached to the remote accelerator lever. The remote accelerator position sensor varies the signal voltage to the engine control module (ECM) as the remote accelerator lever is depressed and released. Low signal voltage is received by the ECM when the remote accelerator lever is at 0 percent. A high signal voltage is received by the ECM when the remote accelerator is at 100 percent. The remote accelerator pedal position circuit contains a remote accelerator pedal position 5 volt supply, remote accelerator pedal position return, and remote accelerator pedal position signal.
Component Location:
The remote accelerator pedal or lever location varies with each original equipment manufacturer (OEM). Refer to the OEM service manual.
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 remote accelerator pedal signal voltage was out of range low.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE lamp immediately after 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 red STOP 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:
The remote accelerator pedal or lever position sensor signal voltage can be monitored with the recommended Cummins® electronic service tool or equivalent, while flexing the harness to locate the intermittent connection. Intermittent connections will show up as abrupt changes in signal voltage displayed by the recommended Cummins® electronic service tool or equivalent.
Possible causes of this fault code include:
-Remote accelerator pedal or lever position signal shorted to engine ground or return wires in the OEM harness or sensor.
-Malfunctioned remote accelerator pedal or lever position sensor.
-Open circuit in the remote accelerator signal, supply, or return wire in the harness or connectors.
NOTE: The three wires in the remote accelerator position sensor circuit must be twisted together.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 100 - FMI 4 (Fault Code 141)
SPN 100 - FMI 3 (Fault Code 135)
Blog.Teknisi
Remote Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source
 |
| Accelerator Pedal or Lever Position Sensor Circuit |
CODES:
Fault Code: 134
PID(P), SID(S): P372
SPN: 974
FMI: 4/4
Lamp: Red
REASON: Low voltage detected at remote accelerator position signal circuit.
EFFECT: Remote accelerator will not operate.
Circuit Description:
The remote accelerator position sensor is a potentiometer attached to the remote accelerator lever. The remote accelerator position sensor varies the signal voltage to the engine control module (ECM) as the remote accelerator lever is depressed and released. Low signal voltage is received by the ECM when the remote accelerator lever is at 0 percent. A high signal voltage is received by the ECM when the remote accelerator is at 100 percent. The remote accelerator pedal position circuit contains a remote accelerator pedal position 5 volt supply, remote accelerator pedal position return, and remote accelerator pedal position signal.
Component Location:
The remote accelerator pedal or lever location varies with each original equipment manufacturer (OEM). Refer to the OEM service manual.
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 remote accelerator pedal signal voltage was out of range low.
Action Taken When the Fault Code is Active:
• The ECM illuminates the red STOP ENGINE lamp immediately after 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 red STOP 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:
The remote accelerator pedal or lever position sensor signal voltage can be monitored with the recommended Cummins® electronic service tool or equivalent, while flexing the harness to locate the intermittent connection. Intermittent connections will show up as abrupt changes in signal voltage displayed by the recommended Cummins® electronic service tool or equivalent.
Possible causes of this fault code include:
-Remote accelerator pedal or lever position signal shorted to engine ground or return wires in the OEM harness or sensor.
-Malfunctioned remote accelerator pedal or lever position sensor.
-Open circuit in the remote accelerator signal, supply, or return wire in the harness or connectors.
NOTE: The three wires in the remote accelerator position sensor circuit must be twisted together.
• Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Read More:
SPN 100 - FMI 4 (Fault Code 141)
SPN 100 - FMI 3 (Fault Code 135)
Blog.Teknisi
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