Case IH U156 – EHR (Electro-Hydraulic Remote) control module / UCM controller: Pilot head timed out

Triggered during the Electro-Hydraulic Remote (EHR) valve calibration procedure because spool sliding movement was not detected or calibration messages from the control module were not detected.

• Puma/Mid Range Magnum
• Case IH Magnum
• Case IH Steiger
• Case IH Puma
• Case IH MX/TG series

1. 1

   Verify if the spool inside the valve body is physically moving or if it is mechanically stuck.

2. 2

   Check CAN BUS wiring by disconnecting one of the remote valve connectors and measuring resistance between terminals 2 and 3 (blue and red wires). It should be approximately 120 ohms. If not, trace and repair the wiring harness.

3. 3

   Ensure the pilot head is receiving calibration messages from the control module.

1. 1

   Disconnect electrical connector

   Disconnect the electrical connector from the faulty EHR pilot head.

2. 2

   Remove pilot head

   Remove the pilot head from the top of the EHR valve slice.

3. 3

   Replace O-rings

   Replace the O-rings between the slice and the pilot head.

4. 4

   Install new pilot head

   Install the new pilot head.

5. 5

   Reassign Valve Addresses

   After replacing the pilot head, you must reassign the valve addresses so the controller knows which in-cab lever controls that specific valve.

6. 6

   Calibrate the Valve

   Use the Electronic Service Tool (EST) to perform the EHR valve calibration procedure to tune the valve for proper function.