SPN 3509 - FMI 3 (Fault Code 386)

SPN3509 FMI3
Sensor Supply 1 Circuit - Voltage Above Normal or Shorted to High Source

Sensor Supply Voltage

Fault Code: 386
PID(P), SID(S): S212
SPN: 3509
FMI: 3/3
Lamp: Amber

REASON: High voltage detected at sensor supply number 1 circuit.

EFFECT: Engine power derate.

Circuit Description:
The sensor supply 1 circuit of the engine control module (ECM) provides a 5 volt supply to various sensors on the engine harness. Refer to the wiring diagram for sensor supply identification.

Component Location:
Sensor Supply 1 originates in the Engine Connector portion of the ECM. It supplies 5 volts to sensors in the engine wiring harness.

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 sensor supply 1 signal voltage was out of range high.

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.
• A default value is used for all of the sensors on the sensor supply 1 circuit.

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:
• High voltage on the (+) 5 volt supply line can be caused by a short to battery voltage in the engine harness or connectors, or a malfunctioning ECM.

Read More:
SPN 1073 - FMI 11 (Fault Code 392)
SPN 1072 - FMI 11 (Fault Code 388)


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