SPN 1072 - FMI 11 (Fault Code 388)
Friday, July 13, 2018
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SPN1072 FMI11
Engine Brake Actuator Driver 1 Circuit - Root Cause Not Known
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)
Blog.Teknisi
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)
Blog.Teknisi
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