BEARING 1334921 - Caterpillar

Illustration 1 g02035679
Schematic of the "Left Joystick Thumbwheel Modulation" controlThis diagnostic code is associated with the "Left Joystick Thumbwheel Modulation" control. 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 "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:
The "Thumbwheel Modulation" control has failed.
Intermittent connections or poor connections
Mechanical devices are loose.
The ECM has failed. This situation is unlikely.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 CID 1657 FMI 08 is active before this procedure is performed.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 to the ON position.
At the back of the harness connector for the joystick, insert a 7X-1710 Multimeter Probe along the voltage supply wire E472-GN (contact 1).
Measure the voltage from contact 1 (wire E472-GN) to frame ground.Expected Result:The voltage is approximately 8 DCV.Results:
OK - The voltage is approximately 8 DCV. Proceed