SPN 1244 - FMI 6 (Fault Code 397)

SPN1244 FMI6
Fuel Control Valve Solenoid Driver 2 - Current Above Normal or Grounded Circuit

Rear Fueling Actuator Circuit

Fault Code: 397
PID(P), SID(S): S83
SPN: 1244
FMI: 6/6
Lamp: Amber

REASON: High current detected at rear fueling actuator circuit.

EFFECT: Possible reduced engine performance.

Circuit Description:
The fuel actuators are actuated by the engine control module (ECM) to control fuel metering. Each fuel actuator is connected to the ECM by a supply and a return wire. An electrical pulse is sent to the fuel actuator from the ECM on the supply wire and returns to the ECM on the return wire. Each solenoid valve is normally closed, and it is only opened by an electrical pulse from the ECM during metering.

Component Location:
The rear fueling actuator is mounted on the fuel control housing.

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) has detected high current at the rear fueling actuator circuit.

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.

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:
Possible causes of this fault code include:
A short circuit to battery in the harness.
• Supply wire open or shorted to ground.
• Low actuator resistance.

Read More:
SPN 1245 - FMI 6 (Fault Code 399)
SPN 1245 - FMI 5 (Fault Code 398)


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