New Holland 1027 – Armrest Controller (ARU) / Hitch Controller (ATC) / Electronic Draft Control (EDC) Module: Not Implemented / Lift Arm Position Voltage Low

In newer CAN-bus systems, indicates a software configuration or communication mismatch where a controller receives a signal for an unsupported feature. In older EDC systems, indicates the maximum lift arm position potentiometer voltage is too low, pointing to a physical electrical failure.

• New Holland T8.xxx Series
• New Holland T6 Series
• New Holland T7 Series
• New Holland TM Series
• New Holland MXM Series

1. 1

   For 'Not Implemented' (Configuration Issue): Verify if any new switches, joysticks, or sensors were recently installed or replaced in the cab/armrest.

2. 2

   For 'Not Implemented' (Configuration Issue): Check the tractor's software configuration to ensure the Armrest controller settings match the physical hardware.

3. 3

   For 'Not Implemented' (Configuration Issue): Check the CAN data bus for communication loss between the Armrest and Hitch controllers.

4. 4

   For 'Lift Arm Position' (Electrical Issue): Inspect the wiring harness leading to the rear lift arm position sensor for chafing, pinched wires, or a short to ground.

5. 5

   For 'Lift Arm Position' (Electrical Issue): Disconnect the sensor and use a multimeter to verify a steady 5V reference and a good ground at the connector.

6. 6

   For 'Lift Arm Position' (Electrical Issue): Measure the resistance sweep of the potentiometer while manually moving the lift arms to check for dead spots.

1. 1

   Connect diagnostic tool

   For 'Not Implemented': Connect the CNH Electronic Service Tool (EST) to the tractor's diagnostic port.

2. 2

   Navigate to configurations

   For 'Not Implemented': Navigate to the Armrest Controller (ARU) and Hitch Controller configurations.

3. 3

   Review and disable options

   For 'Not Implemented': Review the installed options. If a feature (like a specific remote switch or draft pin) is enabled in the software but not physically present on the tractor, disable it in the configuration.

4. 4

   Perform module configuration

   For 'Not Implemented': If a new controller was recently installed, perform a complete module configuration and calibration to match the tractor's build sheet.

5. 5

   Clear fault codes

   For 'Not Implemented': Clear the fault codes and cycle the key to verify the code does not return.

6. 6

   Locate potentiometer

   For 'Lift Arm Position Voltage Low': Locate the lift arm position potentiometer on the rear rockshaft/linkage.

7. 7

   Remove faulty sensor

   For 'Lift Arm Position Voltage Low': If the 5V reference and ground are good but the signal voltage is out of range (too low), remove the faulty sensor.

8. 8

   Install new sensor

   For 'Lift Arm Position Voltage Low': Install the new lift arm position sensor, ensuring the mechanical drive element/linkage is properly aligned.

9. 9

   Reconnect wiring

   For 'Lift Arm Position Voltage Low': Reconnect the wiring harness.

10. 10

    Perform autocalibration

    For 'Lift Arm Position Voltage Low': You must perform a Hydraulic Lift Autocalibration (often associated with code 1024) after replacing the sensor so the EDC module learns the new minimum and maximum voltage limits.