Case IH 2006 – Instrument Cluster Unit (ICU) or Transmission/Armrest Controller: Radar no signal fault

The machine's control network is not receiving a valid frequency signal from the true ground speed radar sensor.

• Farmall
• MX Series
• MX Magnum
• MX100
• MX135
• MX255
• MX285
• TG Series
• Steiger 4WD Series
• Magnum Series
• Magnum 180
• Magnum 190
• Magnum 210
• Magnum 225
• Maxxum Series
• Maxxum 100-140
• Puma Series
• MXM Series
• MXU Series
• JXU Series
• 51 Series

1. 1

   Visual Inspection: Check the radar sensor (usually mounted under the cab or on the lower frame pointing at the ground). Ensure the lens is not heavily caked in mud, snow, or crop debris, which can block the signal.

2. 2

   Grounding Check: Check the ground wire running from the radar to the mounting bolt for a poor chassis ground.

3. 3

   Harness & Connector: Inspect the wiring harness for continuity, rubbed wires, or corroded pins at the sensor connector.

4. 4

   Bypass Test: Unplug the radar sensor. If the A-post display suddenly shows a speed reading when driving above 1 mph with the radar unplugged, the radar sensor itself (or its immediate circuit) is confirmed as the failure point.

5. 5

   Monitor Configuration: Verify in the AFS display or ICU settings that the ground speed source is correctly configured to 'Radar' and hasn't been corrupted.

1. 1

   Park and secure tractor

   Park the tractor on a level surface, turn off the engine, and remove the key.

2. 2

   Locate sensor

   Locate the radar sensor on the lower frame/belly of the tractor.

3. 3

   Disconnect harness

   Disconnect the electrical harness connector from the sensor.

4. 4

   Remove hardware

   Remove the mounting hardware (typically M6 bolts/nuts) securing the sensor to its bracket.

5. 5

   Clean mounting surface

   Thoroughly clean and scrape the metal mounting surfaces on the bracket to bare metal. The radar relies on this physical contact for a clean ground.

6. 6

   Install new sensor

   Install the new radar sensor onto the bracket. Ensure it is oriented correctly (the angle is critical for accurate ground speed calculation; do not bend the factory bracket).

7. 7

   Secure wiring

   Tighten the mounting hardware and reconnect the electrical harness. Secure any loose wiring with nylon zip ties to prevent snagging on crops.

8. 8

   Test and calibrate

   Test drive the tractor. You may need to perform a radar distance calibration via the AFS monitor (driving a measured distance, usually 400 feet, so the computer can learn the pulse count) to ensure the speed readout is perfectly accurate.