Electronic Control Module (ECM) - Replace
Prior to the replacement of the ECM, ensure that replacement is necessary. The ECM is seldom the cause of a failure. Always check that power is available to all of the contacts of the ECM that are marked with "+ Battery".
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 corrupted software. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".
Procedure
- Connect the Caterpillar Electronic Technician (ET). Note all configurations.
- Turn the disconnect switch and the key start switch to the OFF position.
- Disconnect the machine harness connectors from the ECM.
- Verify that the part number of the replacement ECM is correct.
- Install the replacement ECM.
- Connect the machine harness to the ECM.
- Turn the disconnect switch and the key start switches to the ON position.
- Check for correct configurations. If necessary, use the ET to install the configuration software. Refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section of this manual.
- Clear any diagnostic codes that were caused by the previous procedures.
- Verify that the ECM operates correctly.
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