CLAAS Id78A8h / 78A8h – EXT (A62): CSM sequence interrupted - speed not high enough

The CSM (CLAAS Sequence Management) sequence is interrupted. The CSM sequence does not start as speed is not high enough (must exceed 1.5 km/h).

• Axion 800 Series (810, 820, 830, 840, 850)
• Axion 900 Series (920, 940, 950, 960)

1. 1

   Confirm with the operator if they are attempting to trigger a CSM sequence while the tractor is stationary or moving slower than 1.5 km/h (normal system behavior).

2. 2

   Check the ground speed readout on the dashboard (CIS/CEBIS display) while the tractor is moving faster than 1.5 km/h.

3. 3

   If the speed readout is 0 km/h or erratic while moving, diagnose the ground speed/gearbox rotation speed sensor (e.g., sensor B016, B227, or B330 depending on transmission).

4. 4

   Verify the integrity of the CLAAS vehicle CAN bus network and communication module, as communication loss can prevent the EXT module from reading speed.

1. 1

   Correct Operation

   Instruct the operator to ensure the tractor is traveling above 1.5 km/h before pressing the CSM sequence playback button.

2. 2

   Inspect Speed Sensor

   If a speed sensor fault is confirmed via the diagnostic checks, locate the ground speed sensor on the transmission housing.

3. 3

   Check Harness

   Inspect the sensor's wiring harness and connector for physical damage, corrosion, or pushed-out pins. Repair the wiring or replace the connector pigtail if necessary.

4. 4

   Replace Sensor

   If the wiring is intact but the sensor fails resistance/voltage tests (or is physically damaged), replace the ground speed sensor.

5. 5

   Clear Codes & Test

   Clear the error codes using the CLAAS Diagnostic System (CDS) or by cycling the ignition. Perform a test drive at a speed greater than 1.5 km/h and trigger the CSM sequence to verify the repair.