TUBE 7C9463 - Caterpillar

Test Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect ECM vehicle harness connector J1/P1, the firewall bulkhead connector, the connectors for the power train control module, and the connector terminals for the J1939 data link. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the J1939 data link. Refer to Illustration 3.
Check the ECM connector (allen head screw) for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Check the harness and wiring for abrasion and pinch points from the data link connectors back to the ECM. Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Perform the following repair:Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled.Verify that the repair eliminates the problem.STOPTest Step 2. Connect the Electronic Service Tool and Check for Active Diagnostic Codes
Connect Cat ET to the data link connector.
Turn the ignition key switch to the ON position.
Monitor the active diagnostic code screen of Cat ET. Check and record active diagnostic codes. Expected Result:One of the following diagnostic codes is active:
231-11 (58)Note: The "Powertrain Data Link" parameter is a customer parameter that must not be programmed to "J1939", unless the J1939 data link is being used. If J1939 is not connected and the parameter is programmed for J1939 the following active diagnostic code will occur:
231-11 (58)Results:
Yes - 231-11 diagnostic code is active. Proceed to Test Step 3.
No - 231-11 diagnostic code is not active. Proceed to Test Step 4.Test Step 3. Use the Special Test on the Electronic Service Tool to Check the Devices on the J1939 Data Link
Verify that Cat ET is connected to the data link connector.
Access the special test "J1939 Receive Communication Status". The special tests are located under the diagnostic menu.
Cat ET will display the J1939 sources that have transmitted at least one good message that has been successfully received by the ECM. If the ECM has not received any messages from a source, that source will not be displayed. Examples of devices that can use the J1939 data link include the following switches:
Switches that are programmed to "Instrument Cluster"
Switches that are programmed to "Body Controller"
Switches that are programmed to "Cab Controller"
Cat ET will display the J1939 source in the "Description" column. The "Status" column displays the status of the device.
If a message is not received from a device Cat ET will display "Not Receiving".
The status screens on Cat ET can be used to display the status of the inputs that are programmed for J1939 data links. The status screen will display the programmed J1939 source of the input. If the input is programmed to a device that is not sending messages,