HOSE 1226875 - Caterpillar

Illustration 1 g02729055
Schematic of the data link
This diagnostic code is recorded when the Engine 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 Engine ECM is not correct. The communication failure is due to the Engine ECM not responding with parameters which the Advisor ECM is requesting. A disconnected harness or faulty wiring would not cause this. A disconnected harness or faulty wiring would cause an FMI-9 to occur.The possible causes of this diagnostic code are listed:
The Engine ECM has the incorrect software installed.
The Advisor ECM has the incorrect software installed.
Incompatible software may be installed.
The fuse for the Engine ECM may have failed.Test Step 1. CHECK THE ENGINE ECM AND THE ADVISOR ECM FOR PROPER SOFTWARE VERSIONS.
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 Engine 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 switch in order to initialize the new software. Ensure that the diagnostic code is no longer active. STOPTest Step 2. RECHECK FOR DIAGNOSTIC CODES.
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 just replaced , install a new Engine ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace" for the machine that is being serviced.STOP