104 RENR5042-02 Troubleshooting Section It is unlikely that the ECM has failed. Perform this entire procedure again. Replace the ECM if the display does not operate correctly. Refer to Troubleshooting, “Replacing the ECM”. STOP. Not OK The J1939 display does not operate properly on another engine. Repair: Replace the J1939 display. Verify that the problem is resolved. STOP. i02289831 Cat Data Link Circuit - Test SMCS Code: 1901-038 System Operation Description: Note: This procedure checks for an open circuit or a short circuit in the Cat Data Link.
If you are experiencing problems with communications between the Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM), refer to Troubleshooting, “Electronic Service Tool Will Not Communicate with ECM” before you use this procedure. The Cat Data Link is the standard data link that is used by the ECM to communicate with Cat ET. The ECM communicates with Cat ET in order to share status information and diagnostic information. Cat ET can also be used to configure the ECM parameters. This information will not be available if communication fails between the ECM and Cat ET.
g01121169 Illustration 29 Engine components for the Cat Data Link (1) P63 connector for the electronic service tool (2) P61 customer connector (3) J1/P1 connectors B. Thoroughly inspect connectors (1), (2), and (3). Refer to Troubleshooting, “Electrical Connectors - Inspect”. g01119836 Illustration 28 Schematic diagram of the Cat Data Link Test Step 1. Inspect the Electrical Connectors and the Wiring A. Turn the keyswitch to the OFF position.