SWITCH AS-ROCKER 1634534 - Caterpillar

Note: This sensor may have either 6 or 12 pins. The following procedure is not affected.The CID 1471 diagnostic code is associated with the steering position sensor 1. The FMI 03 diagnostic code is activated when the ECM reads the voltage of the input signal from the sensor above the acceptable range.Multiple position sensors are required for correct operation of the steering control. Each sensor provides an input signal to the ECM that indicates the position of the steering control handle. The signal 1 receives power from the 8 VDC power supply circuit and the 8 VDC return circuit from the ECM. The position sensor sends a PWM input signal to the Power Train ECM.The position sensor is a PWM sensor that operates at a frequency of approximately 500 80 Hz. The voltage of the signal range is from 0 to 5 VDC. The duty cycle of the signal varies from approximately 10 percent at the full forward position to approximately 90 percent at the full rearward position. When the steering control handle is at the center position, the duty cycle is approximately 50% and the voltage is approximately 2.5 VDC.The possible causes of this diagnostic code are listed below:
The power supply circuit is open.
The return circuit is open.
The signal circuit is shorted to another voltage source.
The signal circuit is open.
The sensor has failed.
The ECM has failed. This condition is unlikely. System Response:The steer lever position sensor will not operate.Test Step 1. CHECK THE SENSOR POWER SUPPLY
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 C985-BU and along contact 2 J766-PU. Do not disconnect the machine harness connector from the sensor.
Measure the voltage.Expected Result:The voltage measurement is between 7 and 9 VDC.Results:
OK - The voltage measurement is between 7 and 9 VDC. The power circuits for the sensor are correct. Proceed to Test Step 2.
NOT OK - The voltage measurement is less than 7 VDC. The power supply for the sensor is not correct. There is an open circuit or a bad connection in the machine harness. The problem is in C985-BU.Repair: Refer to Electrical System Schematic, Electrical Schematic, UENR1314 for the PL83 or Electrical Schematic, RENR8171 for the 583T. Examine all of the connectors that are in the circuit. Ensure that the connections are clean and secure. Repair the machine harness or replace the machine harness. Refer Troubleshooting, "MID 113 - CID 0041 - FMI 03" for more information on troubleshooting the 8 VDC power supply to the sensor. The 8 VDC power supply from the ECM also supplies power for steering position sensor 2. If a CID 1472 diagnostic