Case IH 2594 (519168.16) - DEC – DEC (Drivetrain Electronic Controller): Even Clutch Pressure Sensor - Data Valid But Above Normal Operating Range - Moderately Severe Level

The fault code 2594 (SPN 519168, FMI 16) indicates an issue within the transmission's hydraulic clutch system. The Even Clutch Pressure Sensor is successfully communicating with the network (Data Valid), but the hydraulic pressure it is reading is higher than the acceptable maximum limit for the current operating state (Above Normal Operating Range - Moderately Severe Level). This typically points to either a failing sensor that is reporting a falsely high value, or a mechanical issue in the Transmission Control Valve (TCV) causing an actual pressure spike in the even clutch circuit.

• MAXXUM T4E
• Magnum 7110
• Magnum 7120
• Magnum 7250
• Magnum 8940
• Series 4 Magnum 235-340
• Models utilizing the ActiveDrive 8 (dual-clutch) transmission

1. 1

   Ensure the transmission fluid is at the correct level and the oil is up to operating temperature (50-80°C) before performing pressure tests.

2. 2

   Connect a diagnostic scan tool and view the real-time parameters for the Even Clutch Pressure Sensor. Compare its readings against the Odd Clutch Pressure Sensor and the regulated system pressure.

3. 3

   Inspect the wiring harness and connector at the Even Clutch Pressure Sensor. Check for shorts to +12 Volts or shorts to ground, which can cause erratic or pegged sensor readings.

4. 4

   Verify that the system pressure solenoid core and the valve spool move freely in their bores. Remove the spool and spring to inspect for burrs, debris, or damage that could cause the valve to stick and over-pressurize the circuit.

1. 1

   Sensor Replacement (If sensor is faulty)

   If diagnostic checks confirm the pressure is mechanically correct but the sensor reading is skewed, the transmission pressure sensor has failed. Relieve the machine's hydraulic pressure, disconnect the electrical harness, and replace the Even Clutch Pressure Sensor on the transmission control valve.

2. 2

   Transmission Calibration

   After replacing the sensor, you must perform a transmission setup and clutch calibration procedure (often found under the 'Cal Pressure' menu in the instrumentation controller) to teach the TCU the new sensor's baseline.

3. 3

   TCV Rebuild (If pressure is actually high)

   If the sensor is accurate and the pressure is genuinely too high, the Transmission Control Valve (TCV) may need to be removed and rebuilt to clear blockages or replace sticking pressure regulator valves.

4. 4

   Clutch Pack Inspection (Worst-case scenario)

   If the issue persists and is accompanied by sluggish shifting in even gears, the transmission may need to be split to inspect the even clutch pack. Mechanics often look for broken Belleville cushion springs/washers or damaged pistons that can disrupt normal clutch fill times and pressures.