Cummins ISB4.5 CM2150 Fault Code: 2363 PID: SID 29 SPN: 1073 FMI: 4 Engine Brake Actuator Driver Output 2 Circuit – Voltage Below Normal or Shorted to Low Source.

Circuit Description
The engine control module (ECM) controls engine brakes on cylinders 4, 5, and 6 by sending a signal on the engine brake solenoid number 2 signal circuit. A 2-pin Weather Pack™ connector is located near the number 3 injector pass-through connector at the back of the engine. There is a jumper harness from this connector to the engine brake pass-through connectors on the rocker lever housing.

Component Location
The engine brake solenoids are located under the valve cover. The engine brake solenoids are controlled through the engine harness by the ECM.

Conditions for Running the Diagnostics
This diagnostic runs when the keyswitch is in the ON position and when the pulse width modulated (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 engine brake 2 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 engine brake 2 circuit will be disabled.

Conditions for Clearing the Fault Code
-To validate the repair, start the engine and operate the vehicle so that the engine brakes are activated. This will allow the diagnostics to run and pass.
-The ECM will turn off the amber CHECK ENGINE light and the fault code will go inactive immediately after the diagnostic runs and passes, or at the next key cycle.
-This fault code can also be cleared with the INSITE electronic service tool.

Shop Talk
The engine brake fault code will only become active once the engine brakes are activated and will remain active until the ECM is powered down. Once the ECM is powered down, the fault code will be inactive until the engine brakes are activated again, if the circuit interruption is still present. This tree is designed to troubleshoot an active or inactive fault code.

Possible Causes
-A short circuit to ground in the engine harness, connectors, or engine brake solenoids
-A malfunctioning ECM.