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SPN 1072 - FMI 11 (Fault Code 388)

SPN1072 FMI11
Engine Brake Actuator Driver 1 Circuit - Root Cause Not Known

Engine Brake Relay Supply Circuit


CODES:
Fault Code: 388
PID(P), SID(S): S79
SPN: 1072
FMI: 11/11
Lamp: Amber

REASON: Low voltage detected at engine brake circuit 1.

EFFECT: None on performance.

Circuit Description:
The Engine Control Module (ECM) enables the engine brake by sending a signal directly to the engine brakes.

Component Location:
The engine brakes are located under the valve cover.

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 low voltage at the engine brake circuit 1.

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:
-Engine brake circuit 1 shorted to ground


Read More:
SPN 1112 - FMI 11 (Fault Code 393)
SPN 1073 - FMI 11 (Fault Code 392)








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