LINER 5F6719 - Caterpillar

Illustration 1 g01802457
Schematic of the "Right Joystick Thumbwheel Modulation" controlThis diagnostic code is associated with the "Right Joystick Thumbwheel Modulation" control. The FMI 08 diagnostic code means that the ECM has determined that the signal frequency or the signal pulse width is not within the expected range.The "Thumbwheel Modulation" control has an output frequency of approximately 500 Hz. The duty cycle of the signal changes as the "Thumbwheel" position is changed. The duty cycle varies from approximately 19% at the minimum position to approximately 77% at the maximum position. The duty cycle is approximately 48% at the center position.The possible causes of this diagnostic code are listed below:
The "Thumbwheel Modulation" control has failed.
Intermittent connections or poor connections
Mechanical devices are loose.
The ECM has failed. This is unlikely.Note: The Machine ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key start switch ON, the following can be determined by the ECM indicator lights:
If all of the LED lights are Off, voltage is not being supplied to the Machine ECM. Check for power to the ECM.
If the yellow LED is Flashing, a communication error exists on the "CAN" data-link circuit.
If the yellow LED is constantly On, the Machine ECM software may be missing / not loaded.
If the red LED is Flashing, the Machine ECM has failed and may need replacement. System Response:When this diagnostic code occurs, there is no warning on the monitor. The function for the work tool that is controlled by the "Thumbwheel Modulation" control will not function.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1658 FMI 08 diagnostic code is active before performing this procedure.Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure. Test Step 1. CHECK FOR POWER AT THE "THUMBWHEEL MODULATION" CONTROL.
Do not disconnect the harness connector from the joystick.
Turn the key start switch and the disconnect switch