WASHER 0686753 - Caterpillar

Procedure
Turn the key start switch to the OFF position. Turn the disconnect switch to the OFF position. The ECM for the D250E and the D300E is located behind the operator compartment. The ECM is accessible after the rear panel is removed. Disconnect the machine harness connectors J1-1 and J1-2 from the ECM.
Illustration 1 g00445510
(1) ECM location for the D250E and D300E.
Illustration 2 g00618977
(2) ECM location for the D350E and the D400E.Note: The ECM for the D350E and D400E is located on the outside of the cab under the engine hood.
Remove the ECM from the machine.
Make sure that the replacement ECM has the correct part number.
Install the replacement ECM.
Connect the machine harness to the ECM.
Turn the disconnect switch and the key start switch to the ON position. Make sure that the ECM successfully completes the start-up test.
Determine whether the replacement ECM is programmed. Connect the Caterpillar Electronic Technician (ET) service tool to the service tool connector of the machine.If the ECM is NOT programmed, the service tool will indicate the problem. An ECM that is NOT programmed must be programmed before use. Use the Caterpillar Electronic Technician (ET) service tool to flash the ECM.If the ECM is programmed, the service tool provides access to the expected areas of the ECM.Select the "Service" menu item with the service tool. Select the "Configuration" function. A list of items will appear. Select the proper items and program the correct information. This information is available from the old ECM or from your dealer.No calibrations are required.