Case IH U1 – Electronic Hydraulic Remotes (EHR): Flow Control For Lever 1 Set Incorrectly During Calibration

During the calibration of the Electronic Hydraulic Remotes (EHR), the flow control dial or lever for remote valve #1 was not placed in the correct position required by the calibration sequence.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• TM120
• TM130
• TM140
• TM155
• TM175
• TM190

1. 1

   Verify that you are following the exact steps for EHR calibration, as the OEM manual explicitly notes a 'U' Fault Code will be displayed if the setup procedure is not followed correctly.

2. 2

   Ensure that the flow control knob for Lever 1 is physically capable of reaching the required calibration setpoint (usually maximum or a specific detent).

3. 3

   Look for other codes that might indicate a hardware failure preventing calibration, such as U01-U04 (potentiometer errors) or 42, 43, 81, 82 (internal valve faults, spool position transducer faults, or mechanical binding).

1. 1

   Clear the Code and Restart Calibration

   Enter the tractor's H-Menu (Calibration/Configuration menu) and restart the Electronic Hydraulic Remotes (EHR) calibration procedure.

2. 2

   Set Flow Control Correctly

   When prompted by the instrument cluster display during the Lever 1 calibration step, ensure the flow control dial for Lever 1 is adjusted exactly as specified in the service manual (typically turned to the fully open/maximum flow position before confirming).

3. 3

   Complete the Sequence

   Proceed through the rest of the remotes (the system will throw U2, U3, or U4 if levers 2, 3, or 4 are set incorrectly). The display will show 'END' to signify completion.

4. 4

   Test the Potentiometer

   If you set the lever correctly but the U1 code persists, the controller is not seeing the correct voltage from the Lever 1 flow control potentiometer. Test the potentiometer for smooth voltage sweep. If it has a dead spot or open circuit, it must be replaced.