Case IH R3 – EHR Control Unit: EHR Control Unit 3 Lever Not Calibrated

The Electronic Hydraulic Remote (EHR) system does not have valid calibration data for the #3 remote control lever. This typically happens if the non-volatile memory in the controller has been reset, if a mechanical or electrical repair was just performed, or if the lever's potentiometer has failed or drifted out of range.

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

1. 1

   Check for associated codes F24, E24, or 24 (indicating Transmission/EDC calibration required) and R31 through R38 (indicating a hard electrical fault in the #3 valve or lever circuit).

2. 2

   Verify if the microprocessor, a PWM solenoid valve, or a potentiometer was recently replaced, as this will automatically trigger the need for calibration.

3. 3

   Use the tractor's 'H-Menu' (specifically the H5 Switch Test mode) to verify that the EHR lever switches and potentiometers are registering inputs on the instrument cluster.

4. 4

   Test the wiring harness from the cab controls to the EHR controller, and from the controller to the remote valves, looking for chafing or disconnected plugs.

1. 1

   Preparation

   Lower all equipment to the ground. Place all shift levers in neutral. Block the front and rear wheels.

2. 2

   Enter Calibration Mode

   Press and hold the High and Low range buttons and start the engine. 'CAL' will appear in the transmission display. Release the buttons.

3. 3

   Set Engine Speed

   Adjust the engine speed to 1200 ERPM.

4. 4

   Navigate to EHR Calibration

   Use the menu to navigate to the 'H1' calibration mode.

5. 5

   Calibrate the Lever

   Follow the on-screen prompts on the Electronic Instrument Cluster. You will be required to move the #3 EHR lever through its full range of motion (e.g., into the raise detent, lower, and float positions).

6. 6

   Completion

   The display will show numbers increasing during the calibration process. Hold the required buttons/levers until 'END' displays, signifying completion.

7. 7

   Replace Faulty Components

   If the calibration fails to complete or the code immediately returns, the lever assembly or its internal potentiometer is faulty and must be replaced, followed by a repeat of this calibration procedure.