Case IH 87 – Instrumentation Controller (ICU): Ground Speed Signal is failed in the Instrumentation Controller.

The CAN Data Bus has signaled that the ground speed sensor (typically the transmission wheel speed sensor or radar sensor) has failed, and the controller is no longer receiving a valid speed signal.

• Magnum
• Steiger 280
• Steiger 330
• Steiger 335
• Steiger 380
• Steiger 385
• Steiger 430
• Steiger 435
• Steiger 480
• Steiger 485
• Steiger 530
• Steiger 535
• Magnum 180
• Magnum 200
• Magnum 225
• Magnum 235
• Magnum 240
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 380
• Magnum MX series
• Magnum TG series
• Maxxum 115-150
• Puma 150-240
• Axial-Flow 5130
• Axial-Flow 6130
• Axial-Flow 7010
• Axial-Flow 7120
• Axial-Flow 8010
• Axial-Flow 8120
• Axial-Flow 9010
• Axial-Flow 9120

1. 1

   Inspect the wheel/transmission speed sensor harness for open circuits, shorts to ground, or corrosion at the connector (Cavity A is Signal, Cavity B is Ground).

2. 2

   Verify that the tractor model configuration is correct in the instrumentation controller using a service tool (ensure 'ST MODEL' is set to the correct model number).

3. 3

   If the machine is equipped with a factory radar speed sensor, verify if the slip sensor (radar) has failed, as the system defaults to the transmission speed sensor in certain conditions.

1. 1

   Locate the Sensor

   Locate the transmission output speed sensor on the transmission housing or the radar speed sensor mounted under the cab/chassis.

2. 2

   Remove the Faulty Sensor

   Remove the mounting bracket, guard, bolts, nuts, and washers securing the sensor. Disconnect the wiring harness.

3. 3

   Install the Replacement

   Mount the new transmission speed sensor or radar sensor. Secure the wiring harness with cable ties to prevent chafing.

4. 4

   Clear the Fault

   Once the physical repair is complete, turn the key on. Depress the 'Reset' button on the programmable display to clear the fault from the instrumentation controller.

5. 5

   Test Operation

   Test drive the machine to verify that the ground speed readout on the A-post display is functioning correctly and that the 3-second continuous audible alarm does not return.