New Holland NH 4170 – EHR (Electronic Hydraulic Remote) Controller: EHR Control No. 1 not calibrated

Spool travel calibration data for the #1 Electronic Hydraulic Remote (EHR) valve is missing or out of range.

• T6 / T6000 Series (T6030, T6.140)
• T7 / T7000 Series (T7.220, T7.235, T7.250, T7.260, T7.270)
• T8 Series (T8.390)
• T9 Series (T9.390, T9.450, T9.560)

1. 1

   Check for Communication Codes: Verify if code 4190 (EHR 1 Offline Err) is also present. If active, it indicates a wiring harness failure or dead valve processor rather than just a calibration issue.

2. 2

   Clear Debris: Stroke the manual override lever on the valve back and forth to clear any internal debris or sticking spools before attempting electronic calibration.

3. 3

   Swap Test: Swap the wiring harness connectors between the #1 and #2 remote valve powerheads. If the fault moves to #2, the #1 valve powerhead/solenoid is faulty. If it stays on #1, the issue is in the wiring harness, armrest switch, or controller.

1. 1

   Secure tractor

   Park the tractor safely away from obstacles, firmly apply the parking brake, and block the wheels.

2. 2

   Disconnect implements

   Disconnect all implements from the rear remotes.

3. 3

   Turn off switches

   Ensure all EHR program switches on the armrest are in the OFF position.

4. 4

   Install diagnostic tool

   Install the Diagnostic Connector Jumper (OEM Tool # 380000843) into the tractor's diagnostic socket. (Note: On larger articulated models like the T9 or T7 AutoCommand, a pressure transducer tool, OEM # 380001903, must be connected to the quick release coupler on the valve block).

5. 5

   Turn ignition ON

   Turn the ignition key switch ON.

6. 6

   Navigate to calibration menu

   Use the instrument cluster keys or A-post display to navigate to the 'H1' menu and select the rear EHR symbol. The lower central display will show 'CAL'.

7. 7

   Perform calibration

   Depress the program switch for lever No.1. The system will prompt you to stroke the lever to maximum extend, maximum retract, and neutral.

8. 8

   Retry calibration if needed

   If calibration fails the first time, stroke the valve back and forth manually for a while to free up the spool, then attempt the calibration again.

9. 9

   Replace failed components

   If the system refuses to calibrate, the EHR valve powerhead or the armrest lever potentiometer has failed and must be replaced.