DASH PANEL A 4U9000 - Caterpillar

Illustration 1 g02920616
Schematic of the Cat data linkThis diagnostic code is recorded when the Chassis electronic control module (ECM) does not receive expected information from the Engine ECM through the Cat data link for more than five seconds.System Response:This failure results in events that are logged against an ECM that cannot be explained directly. The Chassis ECM cannot communicate with this ECM or the ECM appears to communicate intermittently.Test Step 1. CHECK FOR ADDITIONAL DIAGNOSTIC CODES FOR THE OTHER ELECTRONIC CONTROL MODULES.
Reconnect all the electronic control modules that use the Cat data link.
Turn the disconnect switch and the key start switch to the ON position.
Check the event list for diagnostic codes that are logged against the other electronic control modules.Expected Result:Diagnostic codes are not present for the other electronic control modules in the event list. Results:
OK - Diagnostic codes are not present for the other electronic control modules (ECM) in the event list.Repair: The Engine ECM may have failed.It is unlikely that the Engine ECM has failed. Exit this procedure and perform this procedure again. Contact the technical communicator of your dealership for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the ECM must be replaced, see the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" Section of this manual.STOP
NOT OK - Diagnostic codes are present for the other electronic control modules. The problem remains. Proceed to Test Step 2.Test Step 2. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
Verify that the following information is correct:
The part number of the onboard software for the Chassis ECM
The part number of the flash software for the Engine ECM
The part number of the Chassis ECM
The part number of the Engine ECMNote: Consult the Business Unit that produces the product for the correct part numbers of the configuration software.Expected Result:All part numbers are correct.Results:
OK - All part numbers are correct. Proceed to Test Step 3.
NOT OK - All part numbers are not correct.Repair: The installed Chassis ECM or the Engine ECM has the wrong part number or the incorrect configuration software is installed. Replace the incorrect Chassis ECM or the Engine ECM with a module that has the correct part number. Flash the correct configuration software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" Section of this manual.STOPTest Step 3. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect all harness connections that are related to the Cat data link. Verify the following:
Connectors are clean.
Connectors are tight.
Check the connectors for proper mating. Ensure that all the seals are present and in place.
Check the harness for signs of damage or abrasion.
Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
Check the exposed wires at the connectors for nicks or signs of abrasion.
Check for moisture inside the connector.
Check the connectors for dirty contacts or corroded contacts.
Check each pin and each socket of the machine harness connectors. Verify