Case IH 18420 – Armrest Control Module (ICP) / CCM: Rear PTO Brake Switch: 'PTO_BrakeSw' CAN signal from ICP - error state

The control network is receiving an invalid, missing, or erroneous signal state from the ICP (Implement Control Panel / Armrest) regarding the position or function of the Rear PTO Brake Switch.

• VESTRUM CVX
• Puma series (140, 165, 180, 195, 210, 225 CVX)
• Magnum series
• Steiger series

1. 1

   Check the CAN Bus Connection: Inspect the wiring harness between the Armrest ICP and the Central Control Unit (CCM) for chafing, loose pins, or corrosion.

2. 2

   Inspect the Switch: Check the physical Rear PTO Brake Switch on the armrest/fender for mechanical damage or sticking.

3. 3

   Test Circuit Continuity: Verify the PTO Brake Signal circuit and the PTO Supply circuit for open circuits or shorts to ground.

1. 1

   Disconnect battery

   Disconnecting battery power before servicing electronic components.

2. 2

   Remove console cover

   Removing the armrest console cover to access the ICP and the Rear PTO Brake Switch.

3. 3

   Replace or repair

   Replacing the faulty switch or repairing the damaged CAN harness wire.

4. 4

   Reassemble and clear codes

   Reassembling the console and clearing the fault codes via the tractor's diagnostic display.