New Holland ENG 1820 – ENGINE Controller (Engine ECU): Speed Sensor: Sensor 1 Out of Range (upper side).

This code indicates that the engine control unit is receiving a signal from Engine Speed Sensor 1 (typically the primary crankshaft or camshaft position sensor) that is outside the expected upper threshold or is implausible. This often points to a sensor that is failing, reading erratically, or suffering from a wiring short/interference that causes the RPM signal to spike artificially high.

• L220 Skid Steer Loaders
• SR175 Skid Steers
• B90B/B100B Backhoes
• T9 Series 4WD Tractors (T9.390, T9.450, T9.505, T9.600, T9.670)
• T9000 Series
• TJ Series (TJ275 through TJ530)
• Steiger 4WD Tractors (335 through 535)
• Puma
• Maxxum series

1. 1

   Check the wiring harness for Sensor 1 for open circuits, short circuits to power/ground, or chafing, and inspect the connector for moisture or corrosion.

2. 2

   Use a diagnostic tool to monitor live data and compare RPM readings of Sensor 1 and Sensor 2; erratic spikes on Sensor 1 isolate it as the fault.

3. 3

   Remove the sensor and inspect the magnetic tip for metal shavings or debris that could distort the signal.

4. 4

   Verify that the sensor is seated correctly and that the tone ring or flywheel teeth are not damaged.

1. 1

   Turn off the machine and disconnect the battery ground to prevent electrical shorts.

2. 2

   Locate Engine Speed Sensor 1 (typically mounted on the flywheel housing or near the engine timing cover).

3. 3

   Disconnect the electrical harness connector from the sensor.

4. 4

   Remove the retaining bolt securing the sensor to the housing.

5. 5

   Carefully pull the sensor out of its mounting bore.

6. 6

   Clean the mounting surface thoroughly.

   Any dirt left behind can alter the sensor gap and cause future reading errors.

7. 7

   Insert the new engine speed sensor and install the retaining bolt.

8. 8

   Reconnect the electrical harness connector.

9. 9

   Reconnect the battery, turn the ignition on, and use a diagnostic tool to clear the ENG 1820 fault code.

10. 10

    Start the engine and verify that the RPM signal is stable and the code does not return.