Cummins ISC CM2150 (2007-09) Fault Code: 1117 PID: SID 251 SPN: 627 FMI: 2 Power Supply Lost With Ignition On - Data Erratic, Intermittent, or Incorrect. Supply voltage to the ECM fell below +6.2-VDC momentarily, or the ECM was not allowed to power down correctly (retain battery voltage for 30 seconds after

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM.

This fault is set active if the ECM battery supply voltage drops below +6.2-VDC while the keyswitch is in the ON position.

Make sure the ECM unswitched battery supply is coming directly from the battery and not the starter. If unswitched power is coming from the starter, it is possible for the battery voltage to drop low enough during cranking to set this fault active.

Where the fault code is inactive, familiarize yourself with the vehicle shutdown practices used by the operator. For example, if there are controls inside the cab that can interrupt the (ECM) power supply (before the end of the 30 second power down process after key OFF), these should be considered as a potential cause when the fault code is being addressed. This should be explained to the operator.

This fault can also be caused by resistance in the ECM battery supply (+) or (-) circuits. Resistance in these circuits can cause the voltage level at the ECM input to drop low enough to set Fault Code 1117 active.

An active Fault Code 1117 can prevent critical aftertreatment soot load information from being saved to permanent memory in the ECM. The use of battery disconnect switches to turn the engine off or any device that disconnects battery voltage to the ECM within 10 seconds of turning the keyswitch OFF can cause damage to the aftertreatment system. Donot operate the vehicle with an active Fault Code 1117.

Possible repairs:

1)Tighten the loose connections and clean the terminals.
2)Charge or replace the battery.
3)Flush the dirt, debris, or moisture from the connector pins.
4)Install the appropriate connector seal if it is damaged or missing.
5)Repair the engine harness.
6)Replace the ECM.
7)Replace the OEM harness
8)Replace the blown fuse(s).
9)Repair or replace the OEM power harness from the OEM power connector to the batteries.
10)Repair or replace the ECM power harness