Case IH 18302 – ACML: CRPM Decrease Switch CAN Signal Error

Indicates an error state with the CAN signal (PB_UserCmd2_Full_06.CRPM_FineTuneDnSw) originating from the ACML. The module is detecting a physical fault with the CRPM Decrease switch (such as being stuck, shorted, or disconnected) or there is a communication error broadcasting the switch's position over the CAN bus.

• VESTRUM CVX
• Case IH Puma Series (e.g., Puma 140, 165, 180, 195, 210, 225 CVX)
• Case IH Maxxum Series (e.g., Maxxum 135 Multicontroller ActiveDrive 8 - Stage V)

1. 1

   Verify the active or stored status of the code in the controller's EEPROM using the display menu 'HB - DISPLAY STORED FAULT CODES'

2. 2

   Test the CRPM decrease switch manually to see if power boost or constant RPM functions respond to operator input

3. 3

   Check the wiring harness connections at the Armrest Control Module (ACML)

4. 4

   Test the physical CRPM switch for continuity to check for a stuck, shorted, or disconnected state

1. 1

   Verify the Code

   Use the tractor's display menu 'HB - DISPLAY STORED FAULT CODES' to verify the active/stored status of the code in the controller's EEPROM.

2. 2

   Symptom Check

   Test the CRPM decrease switch manually to verify if the power boost or constant RPM functions respond to operator input.

3. 3

   General Repair

   Check the wiring harness connections at the Armrest Control Module and test the physical CRPM switch for continuity.

4. 4

   Replace Assembly

   If the switch is integrated into the armrest and has failed internally, or if the ACML is failing to process the CAN signal, replace the module/switch assembly.