Cummins ISX12 CM2250 (2010-12) Fault Code: 2739 PID: SID 237 SPN: 626 FMI: 4 Start Enable Device 1 Circuit (Ether Injection)- Voltage Below Normal or Shorted to Low Source

Circuit Description
The ether injection circuit is a device used by the engine to control the ether injection operation. The ether injection circuit utilizes a Pulse Width Modulated (PWM) signal. A PWM signal is pulsed voltage signal between 0-VDC and system voltage. The frequency of the pulsed voltage signal is dependent on the application requirement.

Component Location
The control solenoid location varies by OEM. Refer to the OEM service manual to determine the location.

Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is in the ON position and when the PWM device is getting energized or de-energized. In some cases the diagnostics can also run at some fixed intervals.

Conditions for Setting the Fault Codes
The ether injection circuit PWM signal is not detected to be system voltage when the PWM signal is turned ON.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
The ether injection operation will be disabled.
Conditions for Clearing the Fault Code
To validate the repair, perform a key cycle, and leave the key in the ON position for 1 minute.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults.

Shop Talk
This fault code is logged when the ECM commands 12-VDC to the ether injection solenoid, but the voltage on the ether injection signal circuit is less than 12-VDC. The low voltage on the signal circuit usually indicates a short circuit to ground in the harness or solenoid.

Possible Cause:
1) Ether Injection Solenoid failure
2) OEM harness
3) ECM failure