SPN 974 - FMI 4 (Fault Code 134)
SPN 974 - FMI 4 (Fault Code: 134)
SPN974 FMI4
CODES:
Fault Code: 134
PID(P), SID(S): P372
SPN: 974
FMI: 4/4
Lamp: RED
SRT:
REASON: Remote Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at remote accelerator position signal circuit.
EFFECT: Remote accelerator will NOT operate. Remote accelerator position will be set to zero percent.
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 electronic 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.
SPN974 FMI4
 |
| ISB, ISC, and ISL - Remote Accelerator Pedal or Lever Position Sensor 1 Circuit |
CODES:
Fault Code: 134
PID(P), SID(S): P372
SPN: 974
FMI: 4/4
Lamp: RED
SRT:
REASON: Remote Accelerator Pedal or Lever Position Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at remote accelerator position signal circuit.
EFFECT: Remote accelerator will NOT operate. Remote accelerator position will be set to zero percent.
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 electronic 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.
When the ECM senses a signal voltage lower than the normal operating range of the sensor, this fault code is set.
Component Location:
The remote accelerator pedal or lever location varies with each original equipment manufacturer (OEM).
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 that the remote accelerator pedal signal voltage is less than 0.1-VDC for more than 1 second.
Action Taken When the Fault Code is Active:
• The ECM illuminates 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:
Possible causes of this fault include:
• Remote accelerator pedal or lever position signal shorted to engine ground or return wires in the OEM harness or
sensor.
• Damaged 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.
Read More:
SPN 91 - FMI 4 (Fault Code 133)
SPN 91 - FMI 4 (Fault Code 132)
Blog.Teknisi
The remote accelerator pedal or lever location varies with each original equipment manufacturer (OEM).
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 that the remote accelerator pedal signal voltage is less than 0.1-VDC for more than 1 second.
Action Taken When the Fault Code is Active:
• The ECM illuminates 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.
- If troubleshooting an intermittent accelerator problem: The remote accelerator pedal or lever position sensor signal voltage can be monitored with the INSITE™ electronic service tool, while flexing the harness to locate the intermittent connection. Intermittent connections will show up as abrupt changes in signal voltage displayed by the INSITE™ electronic service tool.
Possible causes of this fault include:
• Remote accelerator pedal or lever position signal shorted to engine ground or return wires in the OEM harness or
sensor.
• Damaged 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.
Read More:
SPN 91 - FMI 4 (Fault Code 133)
SPN 91 - FMI 4 (Fault Code 132)
Blog.Teknisi
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