Case IH U109 – Transmission Control Module (TCU) / Central Control Unit (CCU) or Electronic Draft Control (EDC) module: Hydro not in position

A calibration error code triggered when the system fails to complete a calibration procedure successfully (FPS, EDC, or EHR calibration) because the controller is not detecting the expected position or speed from the hydrostatic components.

• Case IH Puma Series 125, 140, 165, 180, 195, 210, 225 CVX
• Case IH Maxxum Series
• Case IH MX / TG Series

1. 1

   Check the wiring harness and connectors leading to the hydro-in and hydro-out sensors for chafing, pinched wires, or corrosion.

2. 2

   Inspect the hydro-in and hydro-out sensors for physical damage and verify their frequency/resistance outputs against OEM specs (e.g., hydro-in sensor frequency should read 0 to 4000 Hz).

3. 3

   Check the hydraulic circuit for low pressure by ensuring the transmission/hydraulic fluid is at the correct level and the filters are not clogged.

4. 4

   Listen for abnormal noises and check for mechanical binding in the transmission or draft control linkages that would prevent the hydro unit from reaching its commanded position.

1. 1

   Resolve the Underlying Fault

   Repair or replace any damaged wiring harnesses leading to the sensors. If a sensor tests out of specification or is physically damaged, replace the hydro-in or hydro-out sensor. If hydraulic pressure is low, top off the fluid using the approved hydraulic fluid (e.g., CASE IH AKCELA NEXPLORE™ or HY-TRAN® ULTRACTION), replace hydraulic filters, or repair the hydraulic pump as necessary.

2. 2

   Clear Stored Codes and Memory

   Turn the ignition key switch ON. Access the sub-system screens (e.g., transmission) on the central display. Use the 'H8' menu command to clear all stored calibration values and fault codes from the EEPROM.

3. 3

   Recalibrate

   Once the memory is cleared and the physical repair is complete, re-initiate the calibration procedure (FPS Transmission, EDC, or EHR calibration). Ensure the tractor is at the proper operating temperature before calibrating.

4. 4

   Verify

   Confirm that the calibration completes successfully without the U109 code returning.