Case IH 86 – Instrumentation Controller (ICU): Wheel Slip Signal is failed in the Instrumentation Controller

The controller is no longer receiving a valid wheel slip signal. When this signal fails, automated functions relying on slip control (like draft control or MFD auto-engagement) may be disabled.

• Magnum
• Case IH MX Magnum Series
• Case IH Magnum Series
• Case IH TG Series

1. 1

   Check the instrumentation display for other codes (e.g., PTO 54060 or HITCH 3010). If absent, the issue is highly likely isolated to the radar sensor.

2. 2

   Inspect the radar sensor face (mounted under the cab/chassis) for mud, crop debris, or ice that could block the signal.

3. 3

   Check the radar power supply by disconnecting the harness connector (e.g., C068) and measuring voltage at the power supply pin (Pin C) with the key ON. It should read approximately 5 VDC.

4. 4

   Inspect the wiring harness between the radar sensor and the Instrumentation Controller for open circuits, chafing, shorts to ground, or shorts to a 12V power source.

1. 1

   Prepare the tractor

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

2. 2

   Locate the radar sensor

   Locate the radar sensor assembly, typically mounted on a bracket underneath the right or left side of the cab/chassis facing downward.

3. 3

   Disconnect the electrical connector

   Disconnect the electrical connector from the radar sensor.

4. 4

   Remove the mounting bolts

   Remove the mounting bolts securing the radar sensor to its bracket. Take note of the mounting angle, as the sensor must point at the ground at a specific angle to read correctly.

5. 5

   Install the new radar sensor

   Install the new radar sensor onto the bracket and tighten the mounting hardware.

6. 6

   Reconnect the electrical harness

   Reconnect the electrical harness connector.

7. 7

   Clear fault codes

   Turn the key ON and clear the fault codes from the instrumentation display.

8. 8

   Perform calibration

   A radar/ground speed calibration must be performed via the AFS Pro display or instrumentation panel menu. This usually involves driving the tractor over a known measured distance (e.g., 400 feet) so the controller can learn the new sensor's pulse rate.