COLLAR 5N9070 - Caterpillar

System Operation Description:Use this procedure if the electronic service tool will not communicate with the Electronic Control Module (ECM) through the data link.The following background information is related to this procedure:The data link is the standard data link that is used by the ECM in order to communicate with the electronic service tool.The ECM provides multiple connections for the data link. The technician must ensure that the correct connector is being tested.The positive signal on the data link is from P2:21 to J23:D. The negative signal on the data link is from P2:20 to J23:E. Refer to Illustration 1.The following information refers to the pin number. Ensure that the correct connector is used.CommunicationThe electronic service tool may indicate the following error message:The version of the ECM is not recognized and the integrity of the changed parameters and displayed data is not guaranteed.This message will indicate that the version of the software that is in the electronic service tool is not the same version of the software that is in the ECM. Install the latest version of the software for the electronic service tool in order to rectify the fault.
Illustration 1 g01589673
Schematic of the diagnostic connector and the ECM connector
Illustration 2 g01759897
Typical view of the P2 pin locations for the data link connectors (20) Data link - (21) Data link +Test Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect the following electrical connectors:
P2/J2 ECM connector
Pin D for the diagnostic connector
Pin E for the diagnostic connector
Connectors for the electronic service toolRefer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connectors that are associated with the data link.
Check the screw for the ECM connectors for correct torque of 5.0 N m (44 lb in).
Check the harness for abrasion and pinch points from the wires that connect the diagnostic connector to the ECM.Expected Result:All connectors, pins and sockets should be completely coupled and/or inserted. The harness should be free of corrosion, abrasion and/or pinch points.Results:
OK - Proceed to Test Step 2.
Not OK - Repair: Perform the following repair:Repair the connectors and/or the harness, or replace the connectors and/or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are completely coupled.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Determine the Type of Fault in the Data Link
Connect the electronic service tool to the diagnostic connector that is on the cabinet for the control panel.
Turn the keyswitch to the ON position.Expected Result:The power lamp should illuminate on the communications adapter.Results:
OK - The communications adapter is currently receiving the correct voltage.Repair: If you are redirected to this step from "Check the wiring of the Diagnostic Connector"and if a jumper wire has been installed between pin "A"