PLATE 4K6543 - Caterpillar

sensor is shorted to ground.
The sensor is faulty or the sensor has failed.
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. Ensure that the diagnostic code of CID 1956 FMI 04 is active before performing this procedure. Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:A level 1 warning is generated. The diagnostic code of CID 1956 FMI 04 will be logged in the internal memory of the ECM.Note: Make sure that the Accugrade 10 Volts DC signal from the machine ECM is present and correct. Use the 146-4080 Digital Multimeter to check the signal at contact J1-69 (wire 799-WH) and J1-70 (wire J766-PU) at the J1machine harness connector for the machine ECM. DO NOT PROCEED FURTHER UNTIL THE OUTPUT FROM THE 10 VOLTS DC POWER SUPPLY IS CORRECT.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. There is no apparent damage to 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 damaged part. Proceed to Test Step 2.Test Step 2. CHECK THE ADJUSTMENT AND/OR THE CALIBRATION OF THE SENSOR.
Turn the disconnect switch and the key start switch to the ON position.
Perform the calibration of the position sensor. Note: Make sure that you follow the correct procedure for testing the range of the sensor. See the Troubleshooting, "Calibration" section for additional information on these calibration procedures for the sensor.
Check the status of the diagnostic code.Expected Result:The CID 1956 FMI 04 diagnostic code is not active.Results:
OK - The diagnostic is not active. The adjustment and/or the calibration has corrected the failure. Resume normal operation.STOP
NOT OK - The CID 1956 FMI 04 diagnostic code is still active. Exit the calibration procedure. Proceed to Test Step 3.Test Step 3. CHECK FOR POWER AT THE SENSOR.
Do not disconnect the harness connector from the sensor.
At the back of the harness connector for the sensor, insert a 7X-1710 Multimeter Probe along contact 1 (wire 799-WH) for the voltage supply. Insert the other 7X-1710 Multimeter Probe along contact 2 (wire 799-WH) for the ground signal.
Turn the key start switch and the disconnect switch to the ON position.
Without disconnecting the sensor or the hardware that is associated with the sensor from the machine, take the sensor through the full operating range of the sensor. In order to move the sensor through the full operating range, fully extend and retract the Bucket cylinder