7025 Mercruiser NUT, TERMINAL STUD

Illustration 1 g06349116Recommended Actions
Note: To troubleshoot a 2533-5 or 1072-5 diagnostic code, use the "Compression Brake Low/High Override" on Cat ET. To troubleshoot a 2535-5 or 1073-5 diagnostic code, use the "Compression Brake Med/High Override" on Cat ET.Note: To troubleshoot a 2533-6 or 1072-6 diagnostic code, use the "Compression Brake Low/High Override" on Cat ET. To troubleshoot a 2535-6 or 1073-6 diagnostic code, use the "Compression Brake Med/High Override" on Cat ET.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Active and/or Logged Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Turn the keyswitch to ON.
C. Access the diagnostic overrides under the "Diagnostics" menu.
D. Start the "Compression Brake Low/High Override".
E. Once Cat ET displays the status of the compression brake solenoid, stop the "Compression Brake Low/High Override".
F. Monitor the active code screen on Cat ET. Check and record any active 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 code screen on Cat ET. Check and record any active codes.
Codes
Result: A 2533-5 diagnostic code or a 2535-5 diagnostic code is active now. 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 1072-5 diagnostic code or a 1073-5 diagnostic code is active now. 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 2533-6, diagnostic code or a 2535-6 diagnostic code is active now.
Proceed to Test Step 4.
Result: A 1072-6 diagnostic code or a 1073-6 diagnostic code is active now.
Proceed to Test Step 4.
2. Create a Short Between the Wires of the Suspect Compression Brake Solenoid at the Valve Cover Connector
A. Turn the keyswitch to OFF.
B. Disconnect the harness at the valve cover connector.
C. Fabricate a jumper wire to create a short between the supply wire for the suspect compression brake solenoid and engine ground.
D. Turn the keyswitch to ON.
E. Access the diagnostic overrides under the "Diagnostics" menu.
F. Start the override for the compression brake.
G. Once Cat ET displays the status of the compression brake solenoid, stop the override.
H. Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes.
I. Turn the keyswitch to OFF. Remove the wire short.
Note: A -5 open circuit diagnostic code will be active for the other compression brake solenoid. Ignore the diagnostic codes for the other compression brake solenoid. Ignore any diagnostic codes for the injector solenoids.
Short Circuit Detected
Result: A 2533-6, 1072-6, 1073-6 or a 2535-6 diagnostic code is active now. The harness wiring between the valve cover connector and the ECM is OK.
Proceed to Test Step 3.
Result: A 2533-5, 1072-5, 1073-5 or a 2535-5 diagnostic code is active now. The ECM did not detect the short at the valve cover connector.
Repair: Repair the harness or replace the harness. Verify that the problem is resolved.
3. Create a Short Circuit at the Compression Brake Solenoid
A. Turn the keyswitch to OFF.
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