New Holland 4170 – Hydraulic Control Module: EHR Control No. 1 Not Calibrated

The electronic control system for the number 1 Electronic Hydraulic Remote (EHR) valve has lost its calibration settings. The controller cannot determine the precise position of the valve's spool, which affects the proper operation and performance of the hydraulic function it controls. This commonly occurs after component replacement and requires recalibration to resolve.

• T4
• T5
• T6
• T7
• T8
• T9
• TN75A

1. 1

   Check for other active fault codes (e.g., 4171, 4172, 4190, 4146, 4147) and address them first, as open/short circuits, communication failures, or voltage issues can prevent calibration

2. 2

   Verify that the tractor's electrical system is functioning correctly with stable voltage

3. 3

   Ensure the hydraulic oil is at the proper operating temperature (approximately 50°C). Calibration may be prevented if the oil is too cold (below 5°C) or too hot

4. 4

   Determine if a component, such as a valve or controller, has been recently replaced, as this necessitates valve numbering before calibration

5. 5

   If calibration fails repeatedly, check the potentiometer in the armrest control lever for failure

1. 1

   Warm up the tractor

   Ensure the hydraulic fluid is at its normal operating temperature (approximately 50°C).

2. 2

   Access Calibration Mode

   Access the service menu via the tractor's monitor, a diagnostic tool, or by holding the 'prog' key while turning the ignition on.

3. 3

   Calibrate Valve #1

   Navigate to the hydraulic or EHR calibration section (often in an 'H-menu' or 'ARM' section). Follow on-screen prompts to move the control lever for remote #1 through its full range of motion (pull back, push forward, return to neutral).

4. 4

   Store Calibration Values

   Turn the ignition key off and wait 1 to 30 seconds to allow the control module to store the new calibration values. Restart the tractor and test EHR remote #1 to ensure the code does not reappear.

5. 5

   Program Valve Number (If Replaced)

   If the remote valve assembly was replaced, it must be numbered before calibration. Using diagnostic test switch Tool No. 380000488, enter H-menu mode (e.g., HL). Erase memory by operating the No. 1 EHR timer switch in quick succession. Turn key off and disconnect all remote valve connectors.

6. 6

   Finalize Valve Programming

   Turn key on and reconnect each valve in sequence (starting with #1), waiting for an audible beep for each. Pulse the timer switch again to finalize, turn key off to store settings, and then proceed to recalibrate the control lever (Steps 2-4).