SEAL GP-DUO-CONE 3144134 - Caterpillar

Illustration 1 g02598216
Schematic of the "Stick Angle" Sensor
This diagnostic code is associated with the "Stick Angle" Sensor. The FMI 08 diagnostic code means that the ECM has determined that the signal frequency is not within the expected range.The "Stick Angle" Sensor has an output frequency of approximately 500 Hz. The duty cycle of the signal changes as the position of the boom 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 "Stick Angle" Sensor has failed.
Intermittent connections or poor connections.
The ECM has failed. A failure of the Machine ECM is unlikely.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 2426 FMI 08 is active before performing this procedure.Note: Use the 257-9140 Fluke Digital Multimeter or the equivalent for the measurements in this procedure.Test Step 1. CHECK FOR POWER AT THE "STICK ANGLE" SENSOR.
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 159-BU(Blue).
Measure the voltage from the voltage supply wire (159-BU(Blue)) to frame ground.Expected Result:The voltage is approximately 24 VDC.Results:
OK - The voltage is approximately 24 VDC. Proceed to Test Step 2.
NOT OK - The voltage is not approximately 24 VDC. The circuit is open.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 2.