BEARING ASSEMBLY-- LOWER SHAFT-- FRONT 6L5437 - Caterpillar

cabinet and the front cab ECM compartment. Check each wire section from connector to connector for an open or a bad connection. Ensure that all connections are clean, secure, and in good condition.Repair the machine harness or replace the machine harness. STOPTest Step 2. CHECK THE VOLTAGE STATUS CIRCUITS FOR A SHORT CIRCUITThe key start switch and the battery disconnect switch remain in the OFF position.The machine harness connector J2 remains disconnected from the Drivetrain ECM connector.The cabinet harness connector J1 remains disconnected from the Motor 2 ECM.
Remove the jumper wire from the Drivetrain ECM J1 harness connector that was used in the last step.
At the Drivetrain ECM, disconnect the J1 harness connector. Examine the pins and sockets on the ECM and on the harness connector. Ensure that all of the pins and sockets are secured in the connector, the contacts are clean, and the contacts are in good condition.
At the disconnected Drivetrain ECM J2 connector, use a multimeter to measure the resistance between the status signal contact J2-29 (wire M908-YL) and a good frame ground point. Measure the resistance between the status signal contact J2-29 and all of the other circuit contacts that are used on the J1 and the J2 connector for the Drivetrain ECM. The redundant status signal contact J2-18 should measure a resistance of less than 5.0 ohms.
While observing the resistance measurement, wiggle the J1 harness connector for the Motor 2 ECM. Follow the harness out of the Inverter Cabinet wiggling the harness as you go. On the outside of the Inverter Cabinet, wiggle the machine harness that is connected to the CX-C4 connector on the side of the cabinet. Follow the harness over to the cab and wiggle the harness at the cab wall connector. If possible, wiggle the J2 harness connector for the Drivetrain ECM.Expected Result:The redundant status signal contact J2-18 should measure a resistance of less than 5.0 ohms. Except for the redundant status signal contact J2-18, each of the individual resistance measurements between the status signal contact and each of the other Drivetrain ECM circuits is greater than 4000 ohms.Results:
OK - Each of the individual resistance measurements is greater than 4000 ohms. The redundant status signal contact J2-18 should measure a resistance of less than 5.0 ohms to the status signal contact J2-29. The resistance measurements for the speed sensor circuits are indicating that there is not a short circuit between the status signal circuit and any other circuit. Proceed to Test Step 3.
NOT OK - One or more of the individual resistance measurements is less than 4000 ohms. There is a short circuit between the status signal circuit and another circuit other than the redundant circuit.Repair: The connection diagram at the beginning of this procedure shows all of the voltage status circuit connections that are in the Inverter Cabinet. For complete machine harness and connector information in the circuits between the cabinet connectors and the Drivetrain ECM, refer to the complete machine electrical system schematic. Locate and examine all