WATER PUMP 4S8935 - Caterpillar

to replacement of the controller, ensure that replacement is absolutely necessary. The controller is not normally the cause of a diagnostic code. Follow the troubleshooting flow chart in the Testing and Adjusting section. Note the Troubleshooting Exit Number on the SIMS report.If a specific fault code or a specific error message exists on the monitor, follow the troubleshooting steps for that condition. Consult the Systems Operation section for a description of the error codes. If an intermittent fault or a general error message exists, ensure that the following tests and inspections have been performed before replacing the ECM:
Inspection of the electrical connectors When the controller is replaced, adjustments or calibrations are required. Refer to Testing and Adjusting, "Auxillary Hydraulic Electronic Control System - Test and Reprogram".
Turn the disconnect switch and the keyswitch to the OFF position.
Disconnect the machine harnesses from the controller.
Remove the controller.
Verify that the replacement for the controller has the correct part number.
Install the new controller.
Connect the machine harness to the controller.
Turn the disconnect switch and the keyswitch to the ON position.
Refer to Testing and Adjusting, "Auxillary Hydraulic Electronic Control System - Test and Reprogram" in order to input the required settings for the auxiliary tool that will be used on the machine.
Verify proper operation of the controller.