BUSHING 4387050 - Caterpillar

Illustration 1 g03172818
Articulation Lever Position Sensor connectionsThe articulation lever position sensor is located in the left joystick assembly. The sensor provides an input signal to the ECM. The FMI 08 means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range. The articulation position sensor receives power from the Implement ECM 8 V power supply. The sensor is internally connected to the ground from the Implement ECM 5 V sensor return (ECM ground) and to the ground from the Implement ECM 5 V sensor return (ECM ground). The sensor must lose both grounds in order to lose the ground connection. The illustration above indicates the power and ground connections for the position sensor.Note: For a schematic of the internal power and ground assignments for each individual component in the left joystick, refer to the Systems Operation, "Features" section of this manual.The position sensor is a PWM sensor that operates at a frequency of 500 100 Hz. The position sensor sends a PWM input signal to the Implement ECM. The duty cycle of the signal will vary from approximately 10% at the joystick full articulate left position to approximately 90% at the joystick full articulate right position. When the joystick is in the center (neutral) position, the duty cycle will be approximately 50%. The possible causes of this diagnostic code are listed below:
The sensor has failed.
Intermittent connections or poor connections
The ECM has failed. This is unlikely.Points to Consider When This Code Is Active:Note: If a CID 0041 diagnostic code for the 8 V power supply has been activated by the Implement ECM (MID 082), investigate the problem and fix the problem before proceeding with this procedure.Note: The correct operating temperature range for the sensor is -40 °C (-40.0 °F) to 75 °C (167.0 °F). If an FMI 03 or an FMI 08 diagnostic code becomes active for an articulation lever position sensor when the cab environment is at extreme temperatures, normalize the cab environment in order to keep the sensor operating in the acceptable temperature range. After temperature normalization, verify that the CID 2146 FMI 08 diagnostic code is active before performing this procedure.Before performing this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, that all connections are secure and that all connections are in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the problem has been corrected.Test Step 1. CHECK THE DUTY CYCLE AND THE SIGNAL FREQUENCY AT THE SENSORTurn the key start switch and the disconnect switch to the OFF position.
At the machine harness connector J2 for the left joystick, use a 151-6320