Case IH 518083-00 - DEC – DEC: Park brake pressure sensor - valid data - above normal range (most severe)

The sensor responsible for monitoring the parking brake release pressure is sending a voltage signal that is higher than the maximum valid operating threshold. The system recognizes the data format as valid, but the extreme value indicates a severe condition, which could mean a failing sensor, a short to a high-voltage source, or an actual hydraulic overpressure situation in the park brake circuit.

• MAGNUM AFS Connect
• Magnum AFS Connect 180
• Magnum AFS Connect 200
• Magnum AFS Connect 220
• Magnum AFS Connect 240
• Magnum AFS Connect 250
• Magnum AFS Connect 280
• Magnum AFS Connect 310
• Magnum AFS Connect 340
• Magnum AFS Connect 380
• AFX8010
• Steiger

1. 1

   Use the Electronic Service Tool (EST) to view live data for the park brake pressure sensor with the engine off, and then with the park brake engaged and disengaged

2. 2

   Verify that the supply voltage at the sensor connector is exactly 5V (requires a constant 5V reference power supply from the controller)

3. 3

   Inspect the sensor's electrical connector (C-185) for corrosion, backed-out pins, or moisture, and check the signal wire for a short-to-power condition

4. 4

   Verify the actual regulated hydraulic pressure in the park brake circuit to ensure the sensor isn't accurately reporting a mechanical overpressure issue

1. 1

   Secure the Machine

   Park the tractor on a level surface, engage the park brake manually, turn off the engine, and remove the key.

2. 2

   Locate the Sensor

   Locate the park brake pressure sensor, which is typically threaded into the control pressure manifold block associated with the transmission/drivetrain hydraulics.

3. 3

   Disconnect the Harness

   Carefully unplug the 3-cavity electrical connector from the sensor.

4. 4

   Remove the Sensor

   Place a catch pan underneath to catch any residual hydraulic oil. Unthread the faulty park brake pressure sensor from the manifold.

5. 5

   Install the New Sensor

   Lubricate the new sensor's O-ring seal with clean hydraulic oil. Thread the new sensor into the manifold and tighten to OEM torque specifications.

6. 6

   Reconnect and Clear Codes

   Reconnect the electrical harness. Turn the key on, connect the diagnostic tool, and clear the 518083-00 fault code.

7. 7

   Functional Test

   Start the machine and cycle the park brake switch several times. Monitor the live data to ensure the sensor voltage remains within the normal operating range and verify the fault code does not return.