SHIM 1076265 - Caterpillar

Use this procedure for the following diagnostic trouble codes:
Table 1
Diagnostic Codes
J1939 Code Code Description
(code descriptions may vary) Comments
1072-5 Engine (Compression) Brake Output #1 : Current Below Normal The code is logged.
1072-6 Engine (Compression) Brake Output #1 : Current Above Normal The code is logged.
1073-5 Engine (Compression) Brake Output #2 : Current Below Normal The code is logged.
1073-6 Engine (Compression) Brake Output #2 : Current Above Normal The code is logged. The compression brake uses the engine in order to provide auxiliary braking for the machine. The compression brake reduces wear of the wheel brake components, brake oil temperature, and the chance for engine overspeed. The compression brake also aids in the controllability of the machine.If the retarder is installed on the engine, the configuration parameter for the engine retarder must be set to "Enabled" for this function to operate. The engine ECM will activate the appropriate compression brake solenoids in order to meet the requested level of braking. "Compression Brake Solenoid Override"The Compression Brake Low/High Override and Compression Brake Med/High Override are diagnostic overrides that are available on Caterpillar Electronic Technician (ET). Use the overrides to assist in troubleshooting problems in the circuit for the compression brake. The ECM will only detect shorts in the circuit for the compression brake when the overrides are active. The overrides must be activated and then deactivated before the ECM will detect an open circuit. The ECM will only detect opens in the circuit for the compression brake when the overrides are not active.Note: The engine speed must be zero before the overrides will function.
Illustration 1 g01199118
Location of the compression brake solenoid (typical example)
Illustration 2 g02946837
Table 2
Troubleshooting Test Steps Values Results
1. Check for Active Diagnostic Codes and/or Logged Diagnostic Codes
A. Connect Cat ET to the service tool connector.
B. Turn the keyswitch to the ON position.
C. Access the diagnostic overrides under the "Diagnostics" menu.
D. Start the "Compression Brake Low/High Override" on Cat ET.
E. Once Cat ET displays the status of the compression brake solenoid, stop the "Compression Brake Low/High Override".
F. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
G. Start the "Compression Brake Med/High Override" on Cat ET.
H. Once Cat ET displays the status of the compression brake solenoid, stop the "Compression Brake Med/High Override".
I. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
Diagnostic Trouble codes
Result: A 1072-5 diagnostic code or a 1073-5 diagnostic code is active at this time. If both diagnostic codes are active, the problem is most likely in the shared return wire. Inspect the wire and/or connectors for an open circuit.
Proceed to Test Step 2.
Result: A 1072-6 diagnostic code or a 1073-6 diagnostic code is active at this time.
Proceed to Test Step 4.
Table 3
Troubleshooting Test Steps Values Results
2. Create a Short Between the Wires of the Suspect Compression Brake Solenoid at the Valve Cover Connector
In order to troubleshoot a 1072-5