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QSK60 CM2358 Fault Code 1117 Power Supply Lost With Ignition OnData Erratic, Intermittent, or Incorrect.Supply voltage to the ECM fell below a calibrated limit momentarily, or the ECM was not allowed to power down correctly.Possible reduced engine performance.
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Circuit Description
The engine control module (ECM) receives constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the keyswitch wire when the keyswitch is turned ON.
Component Location
The ECM is connected to the battery by a combination of engine harness and OEM harness connected in series. This direct link provides a constant power supply for the ECM. The location of the battery will vary with the original equipment manufacturer (OEM). Refer to the OEM service manual.
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 ECM power supply was removed before power-down parameters could be saved. The fault code will be active when the keyswitch is turned ON following the incomplete power-down event.
Action Taken When the Fault Code is Active
The ECM logs the fault code immediately when the diagnostic runs and fails.
Power-down data like trip information, maintenance monitor, and fault information will not get saved to permanent memory when the keyswitch is turned OFF.
Conditions for Clearing the Fault Code
To validate the repair, start the engine, let it idle for 1 minute, and then shutdown the engine.
The fault code status displayed by the recommended Cummins
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