COVER AS-OIL COOLER 9N3595 - Caterpillar

System Operation Description:Use this procedure to troubleshoot any suspect problems with the Cat Data Link.The Cat Data Link is used for communication between electronic modules. The Cat Data Link is used to communicate information from the Electronic Control Module (ECM) to the engine monitoring system. The Cat Data Link is used for programming and troubleshooting the ECM.The ECM communicates with the engine monitoring system in order to share engine information and diagnostics that may affect engine operation.The ECM communicates with the Caterpillar Electronic Technician (ET) in order to share status and diagnostic information. Cat ET can also be used to configure the ECM parameters on the engine. This information will not be available if communications fail between the ECM and Cat ET.
Illustration 1 g01055096
Typical schematic
Illustration 2 g01091329
P1 ECM connector
(P1-8) Cat Data Link +
(P1-9) Cat Data Link − Test Step 1. Inspect Electrical Connectors and Wiring
Turn the Engine Control Switch (ECS) to the OFF/RESET position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors that are associated with the circuit. 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 circuit.
Check the ECM connectors (allen head screw) for the proper torque of 6 N m (55 lb in).
Check the harness and the wiring for abrasion and for pinch points. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion or of pinch points.Results:
OK - The connectors and wiring are okay. Proceed to Test Step 2.
Not OK - The connectors and/or wiring need repair.Repair: Repair the connectors and/or wiring or replace the connectors and/or wiring.Repair CompleteTest Step 2. Check for Shorts in the Harness
Disconnect the P1 ECM connector from the ECM.
Disconnect any module that is connected to the Cat Data Link.
Measure the resistance from the following terminals to every terminal on ECM connector P1. Measure the resistance from the following terminals to engine ground.