Case IH F-PF-201 - Display – AFS Pro 1200 Display: GNSS Accuracy Low

The GNSS (Global Navigation Satellite System) position accuracy is not sufficient for automatic rate and section control. A reliable GNSS fix requires a constellation of at least four satellites spread out across the sky. When the receiver cannot maintain this connection, accuracy drops below the threshold required for precision farming tasks.

• MAGNUM AFS Connect
• STEIGER AFS Connect
• AFS Connect Magnum
• Steiger
• Patriot 50 Series
• Legacy machines retrofitted with Case IH Pro 1200 Guidance Kit

1. 1

   Check for Obstructions: Ensure the GNSS receiver is not obstructed by tree lines, tall buildings, or deep valleys that cause signal blockages.

2. 2

   Verify Satellite Constellation: Ensure the system has at least four satellites, preferably at higher elevations relative to the vehicle.

3. 3

   Inspect Wiring and Connections: Ensure the data cables connecting the GNSS receiver (e.g., Vector Pro) to the Pro 1200 display and the Processing & Connectivity Module (PCM) are secure.

1. 1

   Relocate the Machine

   Move the agricultural equipment to a wide-open area with a clear, unobstructed 360-degree view of the sky.

2. 2

   Allow for Signal Acquisition

   Wait for the receiver to acquire a sufficient satellite constellation. A baseline connection must be re-established.

3. 3

   Harness Inspection

   If the fault persists in an open field, physically inspect the wiring harness running from the cab roof (GNSS receiver) to the Pro 1200 display. Look for pinched wires, corrosion in the connectors, or loose zip ties.

4. 4

   Component Replacement

   If the wiring is intact and the receiver consistently fails to track satellites (GPS, Galileo, Glonass, and BeiDou) in open conditions, the GNSS receiver hardware has likely failed and must be replaced.