Case IH 6039: Slope Sensor too high

A 'too high' fault condition on a 5-volt slope, tilt, or inclination sensor indicates that the sensor's signal voltage has exceeded the maximum acceptable threshold (typically above 4.5V to 4.8V). This usually points to a short to power, an open ground circuit, a failed internal component, or the sensor being physically knocked out of its calibrated mechanical range.

• Farmall
• Magnum
• MX Series
• Steiger
• Puma Series
• Axial-Flow series

1. 1

   Visual Inspection: Inspect the sensor linkage and mounting bracket to ensure the sensor hasn't been physically damaged, bent, or pushed past its mechanical limits.

2. 2

   Wiring Harness Check: Disconnect the sensor and inspect the 3-pin connector for dirt, moisture, or corrosion.

3. 3

   Voltage Test: With the key on (engine off), probe the harness connector. Verify a steady 5-volt reference signal from the ECU and a solid ground.

4. 4

   Signal Circuit Test: Check the signal wire for a short to voltage. If the signal wire is shorted to the 5V reference or 12V battery power, the ECU will read the input as 'too high'.

1. 1

   Power down machine

   Power down the machine and turn off the battery disconnect switch.

2. 2

   Locate sensor

   Locate the slope/inclination sensor (location varies: often on the front axle for steering angle, or on the chassis/shoe linkage for combine leveling).

3. 3

   Disconnect electrical connector

   Disconnect the 3-pin electrical connector from the sensor.

4. 4

   Remove hardware and linkage

   Remove the mounting hardware and detach the mechanical linkage arm (if equipped).

5. 5

   Install new sensor

   Install the new OEM sensor and loosely tighten the mounting hardware.

6. 6

   Reattach linkage

   Reattach the mechanical linkage.

7. 7

   Reconnect harness

   Reconnect the electrical harness.

8. 8

   Calibrate sensor

   Power on the machine and navigate to the display monitor's calibration menu. Perform the mandatory sensor calibration procedure (often requiring the machine to be parked on a perfectly level surface) to zero out the sensor.

9. 9

   Tighten hardware

   Tighten all mounting hardware to spec once calibration is successful.