993K Wheel Loader Power Train Caterpillar

Ensure that replacement of the ECM is absolutely necessary prior to replacement of the ECM. The ECM is seldom the cause of a diagnostic code. Always check that the proper ground and power is available to the ECM. Before replacing an ECM, contact the help desk of the ECM Hotline. The ECM Hotline will provide guidance for replacing an ECM. Technical Communicators have information for contacting the ECM Hotline.

Note: New electronic control modules are available either previously programmed for a particular machine or the ECM is not programmed. An ECM that has not been programmed must be programmed by using the Caterpillar Electronic Technician (Cat ET). Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program". See item 6 in order to determine whether the ECM has been programmed.

Note: Corrupted configuration software or the wrong software may cause an ECM to incorrectly report diagnostic codes. Prior to replacing the ECM, flash the ECM with the correct configuration software in order to verify that the failure is not related to the corrupted software. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".

1. Turn the key start switch and the disconnect switch to the OFF position.

2. Disconnect the machine harness from the ECM.

3. Remove the ECM.

4. Ensure that the replacement ECM has the correct part number.

5. Connect the machine harness to the ECM.

6. Determine whether the ECM has been programmed. Connect the Cat ET to the service tool connector. The Cat ET communicates to the ECM.

   The Cat ET will indicate whether the ECM has been programmed. An ECM that has not been programmed must be programmed by using the WinFlash software which is contained in the Cat ET. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".

   The Cat ET will provide access to the ECM, if the ECM has already been programmed.

Note: Some variations in the Cat ET menu may be experienced. View the proper subject for information about a specific ET menu.

Note: Performance will be affected by ANY calibration procedures that are omitted. Make sure that all calibration procedures are performed. Perform all calibration procedures, even if the replacement ECM was acquired from a similar machine.

Note: The profile of the operator will be lost when the ECM is replaced.