BEARING 9S6124 - Caterpillar

Use this procedure if the electronic service tool will not communicate with the ECM through the data link. Also use this procedure if the following diagnostic code is active:
Table 1
Diagnostic Trouble Code for Data Link
CDL Code Description Information About the Code
248-9 Cat Data Link not communicating The engine ECM cannot communicate with the electronic service tool.
There are no 168 diagnostic codes.
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 connection that is used is dependent on the application.If the diagnostic connector is off the engine, the positive data link signal will be from P1:23 to pin "D" of the diagnostic connector. The negative data link signal will be from P1:24 to pin "E" of the diagnostic connector.If the diagnostic connector is on the engine, the positive data link signal will be from P2:21 to pin "D" of the diagnostic connector. The negative data link signal will be from P2:20 to pin "E" of the diagnostic connector.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is not guaranteed.This message will indicate that the version of the software that is in the electronic service tool is obsolete. Install the latest version of the software for the electronic service tool in order to rectify the fault.
Illustration 1 g03363056
Schematic of the diagnostic connector and the data link connector for a diagnostic connector that is mounted off engine
Illustration 2 g03363132
Schematic of the diagnostic connector and the data link connector for an engine mounted diagnostic connector
Illustration 3 g03363075
View of the pin locations for the data link on the P1 connector
(23) Data link positive
(24) Data link negative
Illustration 4 g03362706
View of the pin locations for the data link on the P2 connector
(20) Data link negative
(21) Data link positive
Table 2
Troubleshooting Test Steps Values Results
1. Inspect Electrical Connectors and Wiring
A. Turn the keyswitch to the OFF position.
B. Inspect the connectors in the circuit for the data link.
Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
C. Perform a 45 N (10 lb) pull test on each of the wires that are associated with the data link.
D. Check the screw for the P1 and P2 ECM connectors for correct torque of 6 N m (53 lb in).
E. Check all of the wiring associated with the data link for abrasions and pinch points.
Damaged wire or connector
Result: A damaged wire or damaged connector was found.
Repair: Repair the damaged wire or the damaged connector.
Use the electronic service tool to clear all logged diagnostic codes. Verify that the repair eliminates the fault.
Result: A damaged wire or damaged connector was not found.
Proceed to Test Step 2.
2. Determine the Type of Fault in the Data Link
A.