BUSHING 2810923 - Caterpillar

activate. However, the ground circuit must be repaired before proceeding with this procedure.Do not operate the machine with only one ground connection for the left joystick.Repair the faulty ground circuit or power supply of the circuit before proceeding with this procedure. After repairing the faulty ground circuit or power supply of the circuit, proceed to Test Step 2.Test Step 2. CHECK FOR AN OPEN IN THE SENSOR CIRCUITS FOR BOTH ELECTRONIC CONTROL MODULES
Turn the disconnect switch to the OFF position.
Turn the key start switch to the OFF position.
Disconnect the machine harness connector J1 from the left joystick.
At harness connector J1 for the joystick, place a jumper wire between the ground 2 contact J1-4 (wire X800-OR) and the signal contact J1-2 (wire U739-BR).
Disconnect machine harness connectors J1 and J2 from the Transmission/Chassis ECM.
At the harness connector for the Transmission/Chassis ECM, measure the resistance from ground 2 return contact J1-45 (wire X800-OR) to signal contact J2-18 (wire U739-BR).
While you observe the resistance measurement, wiggle the ECM connector and the sensor connector. Gently pull on the wires and move the wires for both connectors.
At harness connector J1 for the joystick, move the jumper wire to the ground 3 contact J1-8 (wire P967-PU) and the signal contact J1-2 (wire U739-BR) .
Disconnect machine harness connectors J1 and J2 from the Implement ECM 2.
At the harness connectors for the Implement ECM 2, measure the resistance from ground 3 return contact J1-45 (wire P967-PU) to signal contact J2-32 (wire U739-BR).
While you observe the resistance measurement, wiggle the ECM connector and the sensor connector. Gently pull on the wires and move the wires for both connectors.Expected Result:Each measurement is less than 5 ohms at all times during the manipulation of the wiring harness and connectors.Results:
OK - Each measurement is less than 5 ohms. The sensor circuit is not open in either ECM of the input circuit. Proceed to Test Step 3.
NOT OK - The resistance measurement at one or both of the electronic control modules is greater than 5 ohms. There is an open or a bad connection in one or both of the signal circuits.Repair: If both of the resistance measurements are not correct, there is an open or a bad connection on the sensor side of the splice of the connections for the signal wire U739-BR.If one of the measurements is correct and the other measurement is not correct, there is an open or a bad connection on the ECM side of the splice of the connections for the signal wire U739-BR.In either case, refer to the Electrical Schematic of the machine. Check all of the connectors that are in the suspected section of the sensor signal circuit. Inspect the connections for the following:
Connections are clean.
Connections are secure.
Connections are in good condition.Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE SIGNAL CIRCUIT FOR A SHORT
The key start switch and the disconnect switch remain in the OFF position.
The machine harness connectors remain disconnected from the Implement ECM 2 and the Transmission/Chassis