773F, 773F OEM, 777F and 777F OEM Off-Highway Trucks and 775F and 775F OEM Quarry Truck Vital Information Management System (VIMS) Caterpillar

Illustration 1	g01960840
Schematic of the data link 773F and 775F

Illustration 2	g01960839
Schematic of the data link 777F

This diagnostic code is recorded when the Chassis ECM is not sending the necessary parameters to the Advisor ECM at the proper rate. The update rate for parameters that are generated by the Chassis ECM 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:

• The Chassis ECM may be installed with an incorrect software.

• The Advisor ECM may be installed with an incorrect software.

• Incompatible software may be installed.

• The fuse for the Chassis ECM may have failed.

Test Step 1. CHECK THE CHASSIS ECM AND THE ADVISOR ECM FOR PROPER SOFTWARE VERSIONS.

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

Expected Result:

The proper versions of software are installed on the Advisor ECM and the Chassis 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 key start switch in order 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 Ensure that the diagnostic code is no longer active.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 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 Advisor ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace". If the Advisor ECM was replaced, install a new Chassis ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.

  STOP