Case IH 12617 – Transmission Control Unit (TCU) or main vehicle controller: Rear right wheel speed sensor - frequency > 1.5 kHz

The control module is receiving a signal frequency from the sensor that exceeds 1.5 kilohertz. This typically points to an erratic signal, a short circuit, or a sensor malfunction that is causing the system to read an impossibly high rotational speed.

• Maxxum series
• Magnum series
• MX series
• Steiger series

1. 1

   Check the wiring harness leading to the rear right wheel speed sensor. Look for shorts to ground, shorts to power, or open circuits, which are common causes for sensor voltage and frequency anomalies in Case IH systems.

2. 2

   If the tractor is equipped with an optional ground speed radar, verify if the radar is functioning correctly, as a mismatch can sometimes trigger speed sensor faults.

3. 3

   Inspect the sensor itself for physical damage or debris buildup. These sensors are usually accessible externally on the transmission or axle housing.

1. 1

   Locate the rear right wheel speed sensor

   Locate the rear right wheel speed sensor on the transmission or rear axle housing (they are typically externally accessible).

2. 2

   Disconnect the electrical wiring harness

   Disconnect the electrical wiring harness from the sensor.

3. 3

   Unbolt and remove the faulty sensor

   Unbolt and remove the faulty sensor from the housing.

4. 4

   Install the new replacement sensor

   Install the new replacement sensor and secure it.

5. 5

   Reconnect the wiring harness

   Reconnect the wiring harness.

6. 6

   Cycle the tractor's power and clear the fault codes

   Cycle the tractor's power and clear the fault codes from the display monitor to verify the repair.