BASE AS-OIL FILTER 4252061 - Caterpillar

Illustration 1 g02150079
Connections of the blade control lever
This diagnostic code is associated with blade control thumb rocker. The FMI 03 diagnostic code means the input signal from the sensor and the signal voltage is above the acceptable range.The signal receives power from the battery. The position sensor sends a PWM input signal to the Implement ECM. The duty cycle of the signal varies from approximately 90 percent at the full left position to approximately 10 percent at the full right position. When the thumb rocker is at the center position, the duty cycle will be approximately 50 percent. The position sensor is a PWM sensor that operates at a frequency of approximately 500 80 Hz.The possible causes of this diagnostic code are listed:
The power supply circuit is open.
The fuse has blown.
The return circuit is open.
The signal circuit is open.
The signal circuit is shorted to another voltage source.
The sensor has failed.
The ECM has failed. An ECM failure is unlikely. Test Step 1. Check the power supply circuit to the sensor
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
At the machine harness connector for the sensor, insert a multimeter probe along contact "1" wire (176-OR(Orange)) and along contact "2" wire (210-BK(Black)). Do not disconnect the machine harness connector from the sensor.
Measure the voltage. Expected Result:The voltage measurement is between 23.5 VDC and 24.5 VDC.Results:
YES - The voltage measurement is between 23.5 VDC and 24.5 VDC. The power circuits for the sensor are correct. Proceed to Test Step 2.
NO - The voltage measurement is less than 23.5 VDC. The power supply for the sensor is not correct.Repair: There is an open circuit or a bad connection in the machine harness. Verify that the fuse is in good condition and is not blown. Wire (176-OR(Orange)) may have an open circuit. Refer to Electrical System Schematic, KENR8916. Examine all of the connectors that are in