SUPPORT AS 1734816 - Caterpillar

Test Step 1. CHECK THE DUTY CYCLE AND THE SIGNAL FREQUENCY AT THE SENSORTurn the key start switch and the disconnect switch to the OFF position.
At the machine harness connector J1 for the left joystick, use a 151-6320 Removal Tool to remove the signal wire (wire U739-BR(Brown)) and the socket at contact J1-2. The machine harness connector J1 remains connected to the left connector of the joystick.
At the back of the connector of the joystick J1, insert 7X-1710 Multimeter Probes along the sensor signal contact J1-2 and the ground 2 contact at J1-4.
Turn the disconnect switch and the key start switch to the ON position.
With the joystick in a stationary position, measure the frequency of the signal from the sensor.
Observe the measurement of the resistance and wiggle the connector of the joystick. Gently pull on the wires and wiggle the wires.
Measure the duty cycle of the sensor at the connector contacts of the joystick J1-2 and J1-4. Move the joystick through the full range of the sensor that is described at the beginning of this procedure.
Observe the measurement of the resistance and wiggle the connector of the joystick. Gently pull on the wires and wiggle the wires. Expected Result: The frequency of the steering sensor 1 is 500 80 Hz. The duty cycle of the steering sensor 1 is correct according to the description at the beginning of this procedure. The frequency and the duty cycle are stable during the manipulation of the harness connector and the wiring.Results:
OK - The frequency of the sensor and the duty cycle of the sensor are correct and did not change as the harness was manipulated. The sensor is not causing the problem. Reconnect the signal wire and the socket in the machine harness connector for the joystick. Verify that all wires of the joystick are secure in the connector before proceeding to the next step. Proceed to Test Step 2.
NOT OK - The signal frequency and the duty cycle of the steering sensor 1 is NOT correct according to the description at the beginning of this procedure. The sensor has failed.Repair: Perform this test step again in order to verify that the sensor signal is not correct.If the signal of steering sensor 1 is not correct according to the description at the beginning of this procedure, replace the left assembly of the joystick. After replacement of the assembly of the joystick, verify that the operation of the new assembly of the joystick is correct before operating the machine.STOPTest Step 2. CHECK FOR AN OPEN IN THE SENSOR CIRCUIT AT BOTH OF THE ECM MODULES
Turn the key start switch and the disconnect 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(Orange)) and the signal contact J1-2 (wire U739-BR(Brown)) .
Disconnect machine harness connectors J1 and J2 from the TRansmission/Chassis ECM.
At the harness connector for the TRansmission/Chassis