Case IH 6012 – ATC (Advanced Tractor Control): Pressure of the pressure sensor in the steering system above the maximum permissible limit

The control module is receiving a signal voltage from the steering pressure transducer that exceeds the programmed upper threshold (typically > 4.8V on a 5V reference circuit). This condition is usually caused by a short to power in the signal wire, an open ground circuit, an internally shorted sensor, or an actual hydraulic over-pressure event in the steering circuit.

• Steiger T4B
• Steiger 350
• Steiger 380
• Steiger 385
• Steiger 430
• Steiger 435
• Steiger 450
• Steiger 485
• Steiger 535
• Steiger 550
• Steiger 600
• Steiger Quadtrac
• STX280
• STX380
• STX430
• STX530
• Magnum 215
• Magnum 245
• Magnum 255
• Magnum 275
• Magnum 285
• Magnum 305
• Magnum 310
• Magnum 340

1. 1

   Inspect the steering pressure sensor wire harness for chafing, melting, or pinching that could cause a short to power.

2. 2

   Disconnect the 3-pin connector at the sensor. Check for pushed-out pins, corrosion, or moisture inside the connector.

3. 3

   Turn the key ON (engine off). Use a multimeter to verify the sensor is receiving a 5V reference and has a solid ground. Check the signal wire voltage. If the signal voltage is stuck high (above 4.5V–4.8V) while unplugged, there is a short to power in the harness. If the voltage drops to 0V when unplugged but spikes when plugged in (with no hydraulic pressure), the sensor is internally shorted.

4. 4

   If the sensor and wiring test fine, connect a mechanical pressure gauge to the steering priority valve test port to verify that the steering system is not actually experiencing an over-pressure condition due to a stuck relief valve.

1. 1

   Relieve Pressure

   Turn off the engine and cycle the steering wheel back and forth to relieve residual hydraulic pressure in the steering orbital and priority valve circuits.

2. 2

   Locate the Sensor

   Locate the steering pressure sensor, which is typically threaded into the steering priority valve block or the hydraulic lines leading from the steering orbital valve.

3. 3

   Disconnect

   Unplug the 3-pin electrical connector from the sensor.

4. 4

   Remove Sensor

   Using the appropriate wrench, unthread the faulty pressure transducer. Have a rag ready to catch minor hydraulic fluid drips.

5. 5

   Prep the New Sensor

   Ensure the new O-ring is properly seated on the new sensor. Lubricate the O-ring with clean hydraulic fluid.

6. 6

   Install

   Thread the new sensor into the port and tighten to OEM torque specifications.

7. 7

   Reconnect & Test

   Plug the 3-pin connector back in. Start the tractor, cycle the steering lock-to-lock, and check the sensor port for leaks.

8. 8

   Clear Codes

   Use the Electronic Service Tool (EST) or the tractor's diagnostic display to clear the inactive 6012 fault code.