Case IH 7103 – Steering Controller: Steering angle plausibility error (Auto guidance only)

The auto-guidance system (AFS AccuGuide) is receiving erratic, absent, or out-of-range feedback from the steering angle position sensor, causing auto-steer/precision guidance functions to be disabled or impaired.

• Puma/Mid Range Magnum
• Magnum
• Puma
• Steiger
• Maxxum
• Farmall
• Vestrum
• Quantum
• Patriot

1. 1

   Inspect the steering angle sensor (located on the front steering axle) and its linkage for physical damage, loose mounting hardware, or misalignment.

2. 2

   Inspect the sensor's electrical connector and wiring harness for open circuits, or short circuits to ground or Vcc.

3. 3

   Verify that the sensor is receiving the correct 5V reference power supply from the controller.

4. 4

   Access the diagnostic menu to check the displayed potentiometer reading in real-time while manually turning the steering wheel lock-to-lock. Look for dead spots or erratic voltage jumps.

5. 5

   Attempt to recalibrate the steering angle sensor (center, left, and right limits). If the sensor fails calibration, it is internally faulty and must be replaced.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical shorts and ensure no power is going to the steering controller.

2. 2

   Locate the Sensor

   Locate the steering angle position sensor on the front steering axle.

3. 3

   Removal

   Disconnect the electrical connector from the sensor. Unbolt the sensor housing and carefully detach it from the steering linkage.

4. 4

   Installation

   Mount the new steering angle sensor in the exact orientation as the old one. Secure the mounting bolts and reattach the linkage.

5. 5

   Reconnect

   Plug the electrical connector back into the sensor and reconnect the tractor's battery.

6. 6

   Calibration

   Perform a steering angle sensor calibration so the steering controller can learn the new sensor's parameters. Enter the calibration menu (often the "H8" or Proximity Sensor Calibration menu on the dash/display) and follow the prompts to record the center, full-left, and full-right steering positions.

7. 7

   Clear Codes

   Use the diagnostic menu (e.g., the "HC" menu) to clear all stored error codes and verify that code 7103 does not return upon engaging the auto-guidance system.