BODY 4T2744 - Caterpillar

Illustration 1 g02822736
Schematic for the Hydraulic Oil Temperature Sensor
This diagnostic code is associated with the Hydraulic Oil Temperature Sensor. This diagnostic code is caused by abnormal communications between the Machine ECM 1 and the Engine ECM through the CAN 0 data link. The update rate is not correct.Note: A CID 0247 Diagnostic Code may also be active since both codes are related to the data link connection.A possible cause of this diagnostic code is listed below:
The Machine ECM 1 is operating intermittently.The CAN 0 data link is an input and output of all electronic control modules. The data link is designed to carry communications between the electronic control modules. The data link is not a visible component. The data link consists of internal control circuits and the connecting harness wiring.This failure results in events that are logged against an ECM that cannot be explained directly. The Machine ECM 1 cannot communicate with this ECM or the ECM appears to communicate intermittently.System Response:A Level 1 warning is generated.Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
Verify that the following information is correct:
The part number of the flash software for the Machine ECM 1
The part number of the flash software for the Engine ECM
The part number of the Machine ECM 1
The part number of the Engine ECMNote: Consult your Caterpillar Authorized Dealer for the correct part numbers of the flash software.Expected Result:All of the part numbers are correct. Results:
OK - All of the part numbers are correct. Proceed to Test Step 2.
NOT OK - All of the part numbers are not correct. Repair: The installed Machine ECM 1 or the switch panel have the wrong part number or the incorrect flash software is installed. Replace the incorrect Machine ECM 1 or the switch panel with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section for additional information.STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect all harness connections that are related to the CAN 0 data link. Make sure that the connectors are clean and 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. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together. Expected Result:The machine harness connectors are tight and free of corrosion.Results:
OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
NOT OK - The machine harness connectors are in need