Case IH 14061 – Instrument Cluster Unit (INST / ICU) or Armrest Controller: Air brake pressure sensor - short circuit to VCC or option set but sensor not connected

The control module detects a high voltage short on the air brake pressure sensor circuit. Alternatively, the tractor's software has been configured to expect an air brake system, but the sensor is physically missing or disconnected.

• Farmall
• Farmall series (e.g., 105U, 115U Pro EP)
• Puma series (140, 165, 180, 195, 210, 225)
• Maxxum series (e.g., 125)
• Steiger series
• MX/TG series
• Axial-Flow series (e.g., 2166, 2388)

1. 1

   Configuration Check: Verify if the machine is actually equipped with pneumatic trailer brakes. If it is not, the ECU configuration software (SWCD) may have been incorrectly programmed to expect air brakes.

2. 2

   If equipped, inspect the air brake pressure sensor connector and wiring harness for breaks or shorts to the 5V reference wire.

1. 1

   Power Down

   Turn off the machine and disconnect the negative battery terminal to protect the ECU.

2. 2

   Harness Repair

   If diagnostic checks revealed a broken or chafed wire, splice and heat-shrink the damaged section of the harness.

3. 3

   Clean Connections

   If the connector is corroded, clean it with electrical contact cleaner and apply dielectric grease.

4. 4

   Replace Sensor

   If the wiring tests good (continuity from the sensor plug back to the ECU is intact), the sensor itself has failed internally and must be replaced. Remove the old sensor and install the new OEM replacement.

5. 5

   Software Reconfiguration

   If the tractor does not have air brakes, you must connect a diagnostic tool (like the Case IH EST or Jaltest) to the diagnostic port, navigate to the vehicle configuration menu, and disable the "Air Brake Pressure" option.

6. 6

   Clear Codes

   Reconnect the battery, turn the ignition on, and use your diagnostic scanner to clear the inactive fault codes.