Cummins ISX11.9 CM2250 – Service Manual 019-036 Engine Brake Level Switch

If INSITE™ electronic service tool is available, monitor the engine brake level switch for proper operation. If INSITE™ electronic service tool is not available, see the tables below for the type of switch the vehicle is configured with.

Label the wires with the location on the switch or the wire number. Disconnect the four electrical connectors from the switch.

SMALL | MEDIUM | LARGE

Six-Position Switch
Switch	Terminal C	Terminal B	Terminal A
Position	Engine BrakeSelector Signal #3	Engine BrakeSelector Signal #2	Engine BrakeSelector Signal #1
1	Open	Open	Closed
2	Open	Closed	Open
3	Closed	Open	Open
4	Closed	Open	Closed
5	Closed	Closed	Open
6	Closed	Closed	Closed

Three-Position Switch
Switch	Terminal C	Terminal B	Terminal A
Position	Engine BrakeSelector Signal #3	Engine BrakeSelector Signal #2	Engine BrakeSelector Signal #1
1	Open	Closed	Open
2	Closed	Open	Closed
3	Closed	Closed	Closed