Cummins ISB4.5 CM2150 Fault Code: 2185 PID: SID 232 SPN: 3512 FMI: 3 Sensor Supply 4 Circuit – Voltage Above Normal or Shorted to High Source.

Circuit Description
Sensor supply 4 of the engine control module (ECM) provides a 5 volt supply to the accelerator pedal position sensor. The accelerator position sensor is a Hall effect sensor attached to the accelerator pedal. The accelerator position sensor varies the signal voltage to the ECM as the accelerator pedal is depressed and released. Low signal voltage is received by the ECM when the accelerator pedal is at 0 percent. A high signal voltage is received by the ECM when the accelerator pedal is at 100 percent. The accelerator pedal position circuit contains an accelerator pedal position 5 volt supply, accelerator pedal position return, and accelerator pedal position signal.

Component Location
The accelerator pedal assembly is located in the cab. Refer to the original equipment manufacturer (OEM) troubleshooting and repair manual.

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 sensor supply 4 signal voltage is more than 5.25-VDC for more than 1 second.

Action Taken When the Fault Code is Active
-The ECM illuminates the amber CHECK ENGINE light and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
-The engine will only idle.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and let it idle for 1 minute.
-The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.
-The ECM will turn off the malfunction indicator lamp (MIL) after three consecutive ignition cycles that the diagnostic runs and passes.
-This fault code and malfunction indicator lamp (MIL) can also be cleared with INSITE™ electronic service tool.

Shop Talk
This fault code can be caused by a short circuit to a voltage source in the OEM harness or a short circuit to an actuator signal circuit that is greater than 5-VDC.