NUT 4644958 - Caterpillar

Illustration 1 g02643297
Thumb rocker position sensor connectionsThis diagnostic code is associated with the Blade Control Handle Thumb Rocker Position Sensor. The FMI 03 means that the ECM has determined that the signal voltage of the PWM sensor is above normal.Possible causes of the diagnostic code are listed:
The sensor power supply is open.
The signal circuit is open or the sensor is disconnected.
The signal circuit is shorted to a +battery source.
The sensor has failed.
The ECM has failed. This is unlikely. System Response:When the ECM activates diagnostic code for the position sensor, the angle functions for the blade will not operate.Note: Ensure that CID 1870 FMI 03 is active. This procedure can cause new diagnostic codes to be recorded. Ignore these created diagnostic codes. When the problem has been corrected, clear the created diagnostic codes.Test Step 1. CHECK THE SUPPLY VOLTAGE AT THE SENSOR
Turn the disconnect switch and the key start switch to the ON position.
The 12 contact connector for the sensor remains disconnected from the machine harness.
At the machine harness connector for the sensor, measure the voltage between contact "1" (wire 709-OR) and contact "2" (wire J764-BR).Expected Result:The voltage is approximately 10 VDC.Results:
OK - The voltage is approximately 10 VDC. Proceed to Test Step 2.
NOT OK - The voltage measurement is not 10 VDC. Repair: There may be an open in the machine harness. Clear all diagnostic codes and check to see if the diagnostic code is still active. If the code is still active, perform this step again. If supply voltage is not present at the sensor connector, there is an open in the sensor supply circuit of the machine harness. Repair the machine harness