New Troubleshooting Procedure to Identify A4:M1 ECM Battery Failure is Now Available for Certain Off-Highway Trucks {7610} Caterpillar

Reference: Operation and Maintenance Manual, SEBU8406, "793F and 793F XQ Off-Highway Truck", Prepare the Machine for Maintenance

Reference: Operation and Maintenance Manual, SEBU8417, "797F and 797F XQ Off-Highway Truck", Prepare the Machine for Maintenance

Reference: Operation and Maintenance Manual, SEBU9357, "793F Off-Highway Truck", Prepare the Machine for Maintenance

Reference: Operation and Maintenance Manual, M0070546, "797F Off-Highway Truck", Prepare the Machine for Maintenance

The new procedure helps identify the failure mode of a faulted internal battery based on symptoms that are being exhibited.

Note: The procedure only applies to the A4:M1 Electronic Control Module (ECM), the 304-5687 Electronic Control Module, and the 10R-5644 Electronic Control Module. Depending on the machine configuration, not all large Off-Highway trucks contain an A4:M1 ECM. Ensure that the Off-Highway trucks being troubleshot is equipped with the A4:M1 ECM before using this procedure.

Failure Symptoms

An A4:M1 ECM with a failed internal battery may exhibit any of the following symptoms.

• Loss of calibration settings

• Loss of configuration settings

• Service Meter Unit (SMU) hours out of sync with other ECM's

Perform the troubleshooting procedure if any of the symptoms occur.

Prepare the Machine for Maintenance

For the proper procedure, refer to Prepare the Machine for Maintenance in the Operation and Maintenance Manual for your machine listed at the beginning of the article.

Troubleshooting Procedure

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

1. If the ECM is not retaining the accumulated SMU hours recorded after the last key cycle, sync the ECM. Use the "Sync Clock" procedure within the Cat^® Electric Technician (Cat ET) service tool to sync the ECM.

2. START the engine, and RUN the engine. STOP the engine. Cycle the master power disconnect on the machine.

3. Check the accumulated SMU service hours. If the ECM did not retain the accumulated SMU hours after the last key cycle, replace the ECM with the same, new part number.