FAN 3615559 - Caterpillar

Illustration 1 g01248879
Winch Control Handle Position Sensor connectionsThis diagnostic code is associated with the winch control handle position sensor. The FMI 00 means that the ECM has determined that the PWM signal of the sensor is above the normal range.The output frequency of the position sensor is 500 hertz. The value of the sensor's duty cycle is approximately 50% in the neutral position. The duty cycle of the signal increases as the handle is moved from the neutral position forward. The value of the sensor's duty cycle is approximately 90% 5% at the full forward position. The duty cycle of the signal decreases as the handle is moved from the neutral position to the rearward position. The value of the sensor's duty cycle is approximately 10% 5% at the full rearward position. The possible causes of this diagnostic code are listed below:
The sensor has failed.
The signal circuit of the sensor is shorted to the + battery circuit.
The internal linkage of the winch control handle is faulty.
The ECM has failed. This is unlikely.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.Test Step 1. INSPECT THE SENSOR
Perform a visual inspection of the sensor, the wiring for the sensor and the hardware that is associated with the sensor.Expected Result:There is no apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor.Results:
OK - There is no apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor. Proceed to Test Step 2.
NOT OK - There is apparent damage to the sensor, the wiring for the sensor or the hardware that is associated with the sensor. Repair: Replace the handle assembly. After handle assembly replacement, use the Cat ET service tool in order to calibrate the sensor.STOPTest Step 2. CHECK FOR PROPER GROUND AT THE SENSOR
The machine harness remains connected to the sensor.
Turn the key start switch and the disconnect switch to the OFF position.
At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along the ground contact 2 (wire G939-PK).
Measure the resistance from contact 2 to frame ground.Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. The ground circuit is correct. Proceed to Test Step 3.
NOT OK - The resistance is greater than 5 ohms. The ground circuit in the machine harness has failed.Repair: Replace the machine harness or repair the machine harness.STOPTest Step 3. CHECK THE SIGNAL OF THE SENSOR
The key start switch and the disconnect switch remain in the OFF position.
The 7X-1710 Multimeter Probe remains along the ground contact 2 (wire G939-PK).
At the back of the harness connector for the sensor, insert the other 7X-1710 Multimeter Probe along the signal contact 3 (wire P729-BR).
Turn the disconnect switch and the key