M11 Industrial Operation and Maintenance – Engine Brake Does Not Operate

Symptom Tree  

Electronic fault codes are active

For instructions on how to read active fault codes, refer to Procedure 101-007 (Electronic Controlled Fuel System) in Section 1. If fault codes are active, contact a Cummins Authorized Repair Facility.


Engine brake harness connectors are loose or broken

Check the engine brake harness connectors.


Engine brake on/off switch is off

Turn on the switch.


Engine electrical ground is malfunctioning

Check engine ground to chassis and chassis ground to battery negative (-) post. Refer to the OEM service manual.


Engine brake switch wires or connectors are loose

Check the engine brake on/off switch, selector switch, clutch switch, and throttle switch for loose wires and connections.


Lubricating oil leak (internal)

Check the engine brake hose connections, the engine brake housing, and the jumper tube o-rings for oil leaks. the OEM service manual


Engine brake lubricating oil supply line is restricted

Remove the oil supply line. Inspect the supply line for a restriction.


Engine brake adjustment is not correct

Adjust the engine brakes. Refer to a Cummins Authorized Repair Location.

Contact a Cummins Authorized Repair Facility

Last Modified:  09-Dec-2004