Cummins N14 STC, Celect, Celect Plus – Service Manual Engine Brake Does Not Operate (PT™)

Symptom Tree  t036-11

This is symptom tree
Cause Correction

Engine brake piston(s) is stuck

Check the engine brake piston(s) for freedom of movement. Replace the engine brake piston(s) if necessary. Refer to Procedure 020-024 in Section 20.

 

Engine brake power supply connection is loose

Check the engine brake power supply circuit. Check for blown fuses in the power supply wiring. Check the on/off switch for correct operation . Refer to the OEM service manual.

 

Clutch switch is malfunctioning

Check the clutch switch adjustment and the clutch switch circuit. Refer to the OEM service manual.

 

Engine brake throttle switch is malfunctioning

Check the engine brake throttle switch (fuel pump switch . Refer to the OEM service manual.

 

Service brake pressure switch or circuit is malfunctioning

Check the service brake pressure switch and circuit. Refer to the OEM service manual.

 

Engine electrical ground is malfunctioning

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

 

Solenoid valve is malfunctioning

Check for voltage at the solenoid valve. Refer to Procedure 020-024 in Section 20

 

Solenoid valve filter screen is covered with debris

Remove the solenoid valve and clean or replace the screen. Refer to Procedure 020-024 in Section 20

 

Lubricating oil leak (internal)

Check the engine brake hose connections, the engine brake housing, and the jumper tube o-rings for oil leaks. Refer to Procedure 020-024 in Section 20

 

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 Procedure 020-024 in Section 20.

 
Last Modified:  01-Mar-2012