0172845 JOHNSON END CAP AND BEARING ASSY

Illustration 1 g00652190
Schematic for Power train data link
Illustration 2 g00714306
ECM pin locationsTest Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect the J1/P1 ECM connector, the firewall bulkhead connector, the connectors for the power train control module, and the connector terminals for the SAE J1922 data link or 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 SAE J1922 data link or the J1939 data link.Refer to Illustration 4.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
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 should be completely coupled and/or inserted and the harness and wiring should be free of corrosion, abrasion, or 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. Check for Active Diagnostic Codes
Connect Cat ET to the data link connector.
Turn the key switch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record active diagnostic codes.Expected Result:There is an active diagnostic code for the SAE J1922 data link or the SAE J1939 data link.Note: The "Powertrain Data Link" parameter is a customer parameter that must not be programmed to J1939, or J1922 and J1939, unless the J1939 data link is being used.Results:
J1939 - Proceed to Test Step 3.
J1922 - Proceed to Test Step 5.
Not OK - Proceed to Test Step 4.Test Step 3. Check the Devices on the J1939 Data Link.
Connect Cat ET 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 an expected message is not received from a device, Cat ET will display "Not Receiving".
The status screen on Cat ET can be set to display the status of a device that is not working. The status screen will display "No Comm" if a message is not received from the device.Expected Result:Cat ET displays the devices that are used on the vehicle and the ECM is receiving messages from the devices.Results:
Yes - The ECM is receiving messages from the devices that are installed on the vehicle.STOP
No - The ECM is not receiving messages from the devices that are installed on the vehicle.Repair: The devices that can be programmed to use the J1939 data link can be circuits with two wires or circuits with three wires. Bad connections are the most frequent problem. Repair the suspect component or replace the suspect component. This may include the connectors, the wiring, and/or the device. Ensure that the connectors are free of corrosion.STOPTest Step 4. Check the Power Train Status Screen
Illustration 3 g00714416
Table 1
Powertrain Status Group Definition Table    
Heading On Status Screen