Другие предметы \ Детали машин

Compression Brake Solenoid Circuit. Location of the compression brake solenoid. Schematic for the compression brake circuit, страница 5

STOP

  • Not OK - A low current diagnostic code (05) is active at this time. The ECM did not detect the short circuit.

Repair: Repair the harness between the connector for the compression brake solenoid and the valve cover connector for the suspect compression brake solenoid.Verify that the repair eliminates the problem.

STOP

Test Step 8. Create an Open Circuit at the Compression Brake Solenoid

  1. Turn the keyswitch to the OFF position.
  1. Reconnect the valve cover connector.
  1. Remove the valve cover.
  1. Disconnect the connector on the suspect compression brake solenoid.
  1. Inspect the terminals on the solenoid connector for damage.
  1. Turn the keyswitch to the ON position.
  1. Access the "Special Tests" under the "Diagnostics" menu.
  1. Start the "Compression Brake Solenoid Test" on Cat ET.
  1. Once Cat ET displays the status of the compression brake solenoid, stop the "Compression Brake Solenoid Test".
  1. Check for active diagnostic codes and/or logged diagnostic codes that are associated with the compression brake solenoids.

Expected Result:

A low current diagnostic code (05) is active at this time.

Results:

  • OK - A low current diagnostic code (05) is active at this time. The ECM detected the open at the compression brake solenoid. The harness wiring between the solenoid connector for the suspect compression brake solenoid and ECM connector P2 is OK.

Repair: Temporarily connect a new compression brake solenoid to the harness, but do not install the new compression brake solenoid in the engine. Verify that there are no active diagnostic codes for the compression brake solenoid. If there are no active diagnostic codes for the compression brake solenoid, permanently install the new compression brake solenoid. Clear any logged diagnostic codes.

STOP

  • Not OK - A high current diagnostic code (06) is logged at this time. The ECM did not detect the open.

Repair: Repair the harness between the connector for the compression brake solenoid and the valve cover connector for the suspect compression brake solenoid.Verify that the repair eliminates the problem.

STOP

Test Step 9. Check the Status of the Compression Brake Switch

Note: A switch input to the brake electronic control module sets the status of the compression brake. The status is off or automatic. Software for the brake electronic control module controls the level of braking. The levels of braking are low, medium and high. The brake electronic control module requests the engine electronic control module in order to actuate the compression brake solenoids. The request is sent over the Cat data link.

  1. Turn the keyswitch to the ON position.
  1. Use Cat ET in order to connect to the brake ECM.
  1. Operate the compression brake switch and monitor the status for the compression brake.

Expected Result:

The status for the compression brake switch changes from the off state to the automatic state.

Results:

  • OK - The compression brake switch is operating correctly.

Repair: If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".

STOP

  • Not OK - There is a problem in the circuit for the compression brake switch. Proceed to Test Step 10.

Test Step 10. Short the Wires at the Compression Brake Switch

  1. Turn the keyswitch to the OFF position.
  1. Disconnect the connector for the compression brake switch.
  1. Insert a jumper wire between the following terminals of the connector on the harness side:
    • Terminal 2
    • Terminal 3
Скачать файл