793F Series AC Off-Highway Truck/Tractor Braking System Caterpillar

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Data Link Connection

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Schematic of the Cat Data Link circuit

The purpose of the "Advisor" is to display pertinent machine information to the operator and service personnel, and act as a monitoring system. This information includes but is not limited to the parameters of the machine, the system configuration of the machine, and details of the diagnostic events of the machine. The "Advisor" obtains this information over the "Cat Data Link".

This diagnostic code is associated with the "Advisor" module.

This diagnostic code is recorded when the ECM of the "Advisor" is not sending the necessary parameters to the Brake ECM at the proper rate. The update rate for parameters that are generated by the ECM for the "Advisor" is not correct. The communication failure may be due to disconnected connectors or a faulty wiring harness.

The possible causes of this diagnostic code are listed below:

• The ECM for the "Advisor" has software that is incorrect.

• The Brake ECM has software that is incorrect.

• Incompatible software may be installed.

• The fuse for the ECM for the "Advisor" may have failed.

System Response:

The machine response is listed:

• Some implement functions may not work properly.

Test Step 1. CHECK THE ECM FOR THE MESSENGER AND THE BRAKE ECM FOR PROPER SOFTWARE VERSIONS.

1. Use Cat Electronic Technician (ET) to verify that the versions of software are compatible.

Expected Result:

The proper versions of software are installed on the ECM for the "Advisor" and the Brake ECM.

Results:

• YES - The versions of software are compatible. Proceed to Test Step 2.

• NO - The proper software is not installed.

  Repair: Flash the proper software to the appropriate ECM. Cycle the keyswitch to initialize the new software. Ensure that the diagnostic code is no longer active.

  STOP

Test Step 2. RECHECK FOR DIAGNOSTIC CODES.

1. Ensure that the CID 2448 FMI 14 diagnostic code is active.

Expected Result:

The diagnostic code is inactive. The diagnostic code indicator is inactive.

Results:

• YES - The diagnostic code indicator and the diagnostic code are inactive.

  Repair: Clear the diagnostic code.

  STOP

• NO - The diagnostic code is active.

  Repair: Ensure that the proper software is installed before replacing the ECM. If the software is correct, replace the Brake ECM. A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact the Technical Comunicator at your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". If the Brake ECM was replaced recently, install a new ECM for the "Advisor". A failure of the ECM is unlikely. Exit this procedure and perform this procedure again. If the cause of the diagnostic code is not found, replace the ECM. Prior to replacing an ECM, always contact your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".

  STOP