John Deere 003842.01 – XMC: Steering Angle Sensor Voltage Low

The Steering System Control Unit (XMC) has detected a voltage below 0.25 volts from channel 2 of the front axle steering angle position sensor. This indicates a problem with the sensor's ability to provide accurate steering angle information, which is likely caused by mechanical looseness, damaged wiring, or a failure within the sensor itself.

• 6145J
• 6165J
• 6180J
• 6205J
• 8235R
• 8260R
• 8285R
• 8310R
• 8335R
• 8360R
• 8R 230
• 8R 250
• 8R 280
• 8R 310
• 8R 340
• 8R 370
• 8R 410

1. 1

   Power down the tractor, check relevant fuses, and restart the engine to see if the fault clears via an initial system reset.

2. 2

   Jack up the front of the tractor and check for any mechanical looseness or play in the ball joints and other steering components.

3. 3

   Inspect the wheel angle sensor, connecting stem, and collar for any signs of looseness or physical damage.

4. 4

   Visually inspect the wiring harness leading to the wheel angle sensor for damage, corrosion, or loose connections. Wiggle the harness while monitoring sensor readings on the display to check for intermittent connections.

5. 5

   Perform an electrical load test (voltage drop test) on the individual wires of the sensor harness. A voltage drop exceeding 0.2 volts per connection section indicates high resistance or a short. The issue could be located in the section of the harness between the SSU controller and the interconnect on the side of the tractor, or between the interconnect and the sensor itself.

1. 1

   Address mechanical issues

   If any looseness was found in the steering linkage or sensor mounting during inspection, tighten or replace the worn components as necessary.

2. 2

   Repair wiring and connections

   If a wiring issue is identified through visual inspection or electrical testing, repair or replace the damaged section of the harness. Pay close attention to connectors and splice points, as these are common failure points.

3. 3

   Replace the wheel angle sensor

   If the sensor itself is determined to be faulty, replace it. The sensor is typically located on the bottom of the steering column or near the front axle, accessible from the side of the tractor.

4. 4

   Perform steering calibration

   After replacing the sensor or making significant repairs to the steering system, a complete steering calibration must be performed.