HOSE AS 2993678 - Caterpillar

Illustration 1 g00708266
Schematic of the Solenoid Valve (Differential Lock) (1) Solenoid valve (differential lock). (2) Power train Electronic Control Module (ECM).The CID 0740 FMI 03 diagnostic code is recorded when the voltage of the solenoid valve is above normal. The power train Electronic Control Module (ECM) detects the fault. There is a short circuit to a positive battery source. The short circuit occurs in the electrical path from the power train ECM to the solenoid and back to the power train ECM. The solenoid valve is located in the compartment behind the right side door of the machine.Note: Ensure that the diagnostic code CID 0740 FMI 03 for the solenoid valve is active. Before you perform the following procedure, use Table 1 in order to determine the contacts on the connector and the wire numbers that correspond to the fault.
Table 1
Information on the Solenoid Valve (Differential Lock)    
Fault    Connector Contact No. (1)    Wire No.    
Solenoid valve (Differential Lock)     J1-8     324-BU    
( 1 ) The connector contact of the power train ECM.Note: Connector J1 contact 8 (wire 324-BU) of the power train Electronic Control Module (ECM) is the contact for the solenoid valve.
Check the signal circuit of the solenoid valve for a short to a positive voltage source.
Turn the key start switch and the battery disconnect switch to the OFF position.
Disconnect the machine harness from the solenoid valve.
Disconnect the machine harness connectors from the power train ECM.
At the machine harness of the power train ECM, measure the resistance from contact 8 of connector J1 to all possible sources of positive voltage. The possible sources of positive voltage on connector J1 are contacts 1, 6, 28, 34, and 40. The possible source of positive voltage on connector J2 is contact 12.Expected Result: Each resistance should be greater than 5000 Ohms.Results:
OK - The machine harness is correct. Proceed to Step 2.
NOT OK - There is a short in the machine harness. The short is between the contact of the solenoid and the circuit with a low resistance measurement. Refer to Table 1. Repair the machine harness or replace the machine harness. STOP.
Check if the fault is still present.
The key start switch and the battery disconnect switch remain in the OFF position.
Inspect the contacts and clean the contacts of the harness connectors.
Connect all the harness connectors.
Turn the battery disconnect switch to the ON position.
Start the engine.
Enter the service mode of the Caterpillar Monitoring System. Clear all inactive faults.
Attempt to operate the machine.
Stop the machine.
Check for the CID 0740 FMI 03 diagnostic code for the solenoid valve.Expected Result: The CID 0740 FMI 03 diagnostic code for the solenoid valve is active. The "SERV CODE" is showing in the display.Results:
YES - The fault has not been corrected. Replace the solenoid valve. Perform the previous steps again. If the cause of the fault is not found, replace the power train ECM. Refer to Testing and Adjusting, "Electronic Control Module (Power Train) - Replace" for information on replacing the power