Case IH 116-03 - DEC – DEC: Brake Application Pressure - Voltage Above Normal, or Shorted to High Source

The control module is receiving a voltage signal from the service brake pressure sensor that exceeds the maximum valid threshold (typically above 4.5V or 4.75V on a 5V reference circuit). This is typically caused by the sensor's signal wire shorting to battery power, an open circuit on the sensor's ground wire, or an internal sensor failure.

• MAGNUM AFS Connect
• Farmall 95U
• Farmall 105U
• Farmall 115U
• Farmall 105A
• Farmall 105C
• Maxxum 145
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Steiger 400
• TR320

1. 1

   Inspect the wiring harness leading to the service brake pressure sensor for chafing, melting, or pinch points. Check the connector for water intrusion, corrosion, or backed-out pins.

2. 2

   Disconnect the sensor and turn the key ON (engine off). Measure the voltage at the signal pin on the harness side. If it reads 12V (battery voltage), there is a short to power in the harness that must be repaired.

3. 3

   Measure the resistance between the sensor ground pin on the harness and a known good chassis ground. It should be less than 5 ohms. An open ground will cause the voltage above normal condition.

4. 4

   If the 5V reference, ground, and signal wires test good on the harness side, the sensor has failed internally and must be replaced.

1. 1

   Secure the Machine

   Park the tractor on a level surface, turn off the engine, and engage the parking brake.

2. 2

   Depressurize the System

   Pump the service brake pedal several times to relieve any residual hydraulic or pneumatic pressure in the brake lines to prevent injury or fluid/air loss.

3. 3

   Locate the Sensor

   Find the service brake pressure sensor (often located on the pneumatic trailer brake valve block or the main service brake valve assembly).

4. 4

   Remove the Sensor

   Disconnect the electrical connector. Use a wrench to carefully unthread the sensor from the port. Have a rag ready to catch any minor fluid drips if it is a hydraulic sensor.

5. 5

   Install the New Sensor

   Thread the new OEM sensor into the port. Tighten to the manufacturer's specified torque (do not overtighten, as this can damage the sensor diaphragm).

6. 6

   Reconnect and Clear

   Plug in the electrical connector. Turn the key ON, and use the tractor's diagnostic menu or a scan tool to clear the 116-03 DEC fault code.

7. 7

   Test

   Start the engine, allow brake pressure to build, and test the service brakes to ensure proper operation and verify that the code does not return.