GEAR 7N4716 - Caterpillar

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.
Illustration 1 g01129351
Schematic for the marine auxiliary
Illustration 2 g01158305
Schematic for the marine generator setTest Step 1. Inspect the Electrical Connectors and the Wiring
Turn the keyswitch to the OFF position.
Illustration 3 g01130303
Typical engine components for the Cat Data Link (1) J61 customer connector (2) J60 connector for the electronic service tool (3) J1/P1 connectors
Thoroughly inspect connectors (1), (2) and (3). Inspect all of the other connectors that are associated with the circuit for the Cat Data Link. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Verify that the wiring for the Cat Data Link is installed correctly. Refer to Special Instruction, REHS1187, "Electronic Installation Guide" for additional information.
Check the following components for abrasion, for corrosion, or for incorrect attachment.
Global Positioning System Interface Module (GPSIM)
Engine Vision Interface Module (EVIM)
Engine Vision Display
EMCP 3 (GSC)Ensure that the 163-3973 Cable is securely connected to the EVIM and to the Engine Vision Display.
Verify that each individual ECM is programmed to the proper engine location.
Illustration 4 g01157723
P1 terminals that are associated with the Cat Data Link (P1-8) Cat Data Link + (P1-9) Cat Data Link −
Illustration 5 g01130718
Terminals on the customer connectors that are associated with the Cat Data Link (6) Cat Data Link − (7) Cat Data Link +
Illustration 6 g01130713
Terminals on the service tool connectors that are associated with the Cat Data Link (D) Cat Data Link + (E) Cat Data Link −
Perform a 45 N (10 lb) pull test on each of the wires that are associated with the Cat Data Link.
Check the allen head screw on each ECM connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the allen head screw on the customer connector for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the wiring harnesses for abrasion, for corrosion and for pinch points.Expected Result:All connectors, pins and sockets are completely coupled and/or inserted. The harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and wiring appear to be okay. Proceed to Test Step 2.
Not OK - There is a problem in the connectors and/or the wiring.Repair: Repair the connectors and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are completely coupled. Verify that the problem is resolved.STOPTest