DISC-CLUTCH 2384687 - Caterpillar

Illustration 1 g02362836
Left Joystick "Steer Sensor 2" connections
Three steering position sensors are required for correct operation of the steering control. The steering position sensors are located in the left joystick assembly. Each sensor provides an input signal to the Implement ECM 2 and to the "Transmission/Chassis ECM". The ECM expects the input signals from all three steering position sensors to match closely. The FMI 14 diagnostic indicates that the sensor input signal does not match the other two sensors. The Transmission/Chassis ECM determines the status of the input signals from the three steering sensors. The code is active when "Steering Sensor 2" does not match another sensor but still matches the third sensor.The "Steering Position Sensor 2" receives power from the 8 VDC power supply of the Implement ECM 2. The "Steering Position Sensor 2" is internally connected to the ground at both ECM modules. The steering sensor must lose both grounds in order to lose a ground connection. The illustration above indicates the power and ground connections for the "Steer Sensor 2".The position sensor is a PWM sensor that operates at a frequency of approximately 500 80 Hz. The position sensor sends a PWM input signal to the Implement ECM 2 and to the "Transmission/Chassis ECM". The duty cycle will vary from 10% at the lever full left position to 90% at the lever full right position. When the lever is in the center position, the duty cycle will be approximately 50%.The possible causes of this diagnostic code are listed below:
The sensor has failed.
The ECM has failed. A failure of the Transmission/Chassis ECM is unlikely.Note: If an MID 145 CID 0041 diagnostic code is active, fix the problem before proceeding with this procedure.Note: The correct operating temperature range for the steering sensors is −40 °C (−40.0 °F) to 75 °C (167.0 °F). Return the temperature in the cab to normal when the cab temperature is extreme resulting in an FMI 03 or FMI 08 diagnostic code. An FMI 14 diagnostic code is also possible in these circumstances. Returning the temperature in the cab to a normal temperature will keep the steering position sensors operating in the acceptable temperature range. After stabilization of the temperature, verify that the CID 1472 FMI 14 diagnostic code is active before performing this procedure.Note: The "Transmission/Chassis ECM" (MID 027) and the Implement ECM 2 (MID 145) receive an input signal from the "Steering Sensor 2". Both ECM modules can activate a CID 1472 FMI 14 diagnostic code. The code is activated when the signal from one steering sensor does not closely match the signal from one of the other steering sensors. If one ECM has activated a CID 1472 FMI 14 diagnostic code and the other ECM has not, the sensor is probably operating correctly. When this condition occurs, a poor connection in the machine harness would be suspected. When both ECM