SEAL ASSEMBLY 1539694 - Caterpillar

Which Generate This Code:This diagnostic code is associated with the Right Joystick Thumbwheel Modulation control. The FMI 13 means that the ECM has determined that the signal of the Thumbwheel Modulation control is not within expected limits. The possible causes of this diagnostic code are listed:
The Thumbwheel Modulation control needs to be calibrated.
The Thumbwheel Modulation control needs to be adjusted.
The ECM has been flashed with new software.
The Thumbwheel Modulation control has failed.
The ECM has failed.Note: Ensure that you have repaired any condition that would cause other active diagnostic codes that are related to the Thumbwheel Modulation control. For example, the CID 1658 FMI 03 or FMI 04 are not active when the CID 1658 FMI 13 is active. If the other diagnostic codes are active, troubleshoot those codes first. Then perform this procedure.Note: Ensure that the diagnostic code of CID 1658 FMI 13 is active before performing this procedure.Test Step 1. CHECK THE CALIBRATION
Perform the necessary adjustment and calibration procedures. Refer to the Testing and Adjusting section of the Service Manual for these procedures.
Observe the status of the CID 1658 FMI 13.Expected Result:The CID 1658 FMI 13 is not active.Results:
OK - The CID 1658 FMI 13 is not active. The calibration corrected the condition that caused the CID 1658 FMI 13. Resume normal operation. Stop.
NOT OK - The CID 1658 FMI 13 is still active.Repair: The diagnostic code is still active. Verify that the correct software has been flashed into the ECM, or that the correct ECM is installed on the machine. Then repeat the calibration. If the diagnostic code is still active and the cause of the diagnostic code is not found replace the ECM. It is unlikely that the ECM has failed. Verify that the Thumbwheel Modulation control and associated circuits are correct before you replace the ECM. Stop.