HUB 9R0314 - Caterpillar

Table 4
Troubleshooting Test Steps    Values    Results    
3. Create a Short Circuit at the Compression Brake Solenoid
Two solenoids are activated in order to create a medium braking action. The open could be in either solenoid or in the harness. In order to isolate the problem for a medium braking action, run this test step for each of the solenoids. The short must be created separately at each solenoid.
In order to troubleshoot a 2533-5 or 1072-5 diagnostic code, use the "Compression Brake Low/High Override" on Cat ET. In order to troubleshoot a 2535-5 or a 1073-5 diagnostic code, use the "Compression Brake Med/High Override" on Cat ET.
A. Turn the keyswitch to the OFF position.
B. Remove the valve cover.
C. Reconnect the valve cover connector.
D. Disconnect the connector on the suspect compression brake solenoid.
E. Inspect the terminals on the connector for the compression brake solenoid for damage.
F. Fabricate a jumper wire in order to short the two wires for the suspect solenoid on the solenoid connector. Crimp a pin to each end of the jumper wire.
G. Make sure that the solenoid connector securely holds the jumper wire.
Worn terminals and/or damaged terminals on the solenoid connector could cause an intermittent "Open".
H. Turn the keyswitch to the ON position.
I. Access the diagnostic override under the "Diagnostics" menu.
J. Start the override for the compression brake.
K. Once Cat ET displays the status of the compression brake solenoid, stop the override.
L. Monitor the active diagnostic code screen on Cat ET.