LINES GP-AIR 3331462 - Caterpillar

This diagnostic code is associated with the Hoe Left Joystick Thumbwheel position sensor. The position sensor is embedded in the handle of the joystick The position sensor provides a PWM input signal to the Machine ECM. The FMI 13 diagnostic code is activated when the ECM detects a sensor that needs calibration.The sensor is a PWM sensor that operates at a frequency of approximately 500 100Hz. The duty cycle of the PWM signal that is supplied to the ECM is measured in small increments. The changes in the duty cycle of the sensor cannot be measured with a digital multimeter.Test Step 1. CALIBRATION
Perform the calibration procedure for the sensor. Refer to the Testing and Adjusting, "Calibration" Story in this manual for the correct calibration procedure. Expected Result:The calibration procedure was performed successfully.Results:
OK - The calibration procedure was performed successfully. Resume normal machine operationSTOP
NOT OK - The calibration was not successful.Repair: Repeat the calibration procedure for the sensor.If the second calibration procedure is not successful, replace the joystick.If the problem is still present after replacement and calibration of the new joystick, the ECM may have failed.Prior to replacing an ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. If the cause of the diagnostic code is not found, replace the ECM. Refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" Story in this manual for additional information.STOP