Case IH F-522817-12 - CGR – CGR: Internal IMU Fault

The internal Inertial Measurement Unit (IMU) hardware has failed, lost calibration, or is reporting invalid internal data that cannot be resolved by the processor.

• MAGNUM AFS Connect
• STEIGER AFS Connect
• Case IH AFS Connect Magnum Series (Models 180, 200, 220, 240, 250, 280, 310, 340, 380)
• Case IH Steiger Series (AFS Connect models)
• Case IH Patriot Sprayers

1. 1

   Check the CGR serial interface cable and harness for proper voltage and clean grounds to rule out voltage spikes or drops causing internal component errors.

2. 2

   Verify the CGR software version via the AFS Pro 1200 display and update if necessary (e.g., to version 1.1.0.0 or 2.1.0.0) to patch erroneous fault logic.

3. 3

   Perform a hard reset by power cycling the tractor, turning off the battery disconnect switch for 5 minutes, and powering it back on to see if inactive codes can be cleared.

1. 1

   Power Down

   Turn off the machine and engage the battery disconnect switch to prevent electrical arcing.

2. 2

   Disconnect Harness

   Safely access the cab roof. Disconnect the CGR serial interface cable/wiring harness from the back of the receiver.

3. 3

   Remove Receiver

   Unlatch or unbolt the faulted CGR receiver from the roof mounting bracket.

4. 4

   Install New Receiver

   Mount the replacement AFS Vector Pro / PLM Cygnus receiver onto the bracket and secure it.

5. 5

   Reconnect

   Plug the serial interface cable back into the new receiver.

6. 6

   Configuration & Unlocks

   Power on the machine. Access the AFS Pro 1200 or Pro 700 display. Input activation/unlock codes (via the CNH VMS portal) to restore the customer's specific accuracy level (e.g., Medium, High, or RTK).

7. 7

   Calibration

   Because the IMU is new, you must perform a terrain compensation/roll calibration on a hard, flat, and level surface as outlined in the PRO 1200 Software Operating Guide.