Case IH 18325 (4164.02, 4164.03, 4164.04, 520623.07) - ACML – ACML: MFH CVT Range "Plus" Switch Error State

The control module is receiving an implausible signal, an open circuit, or a short (to ground or power) from the MFH CVT Range "Plus" Switch.

• MAXXUM T4E
• VESTRUM CVX
• Case IH Magnum CVT Series (235, 260, 290, 315, 340, 370, 380)
• Case IH Steiger CVT Series
• Case IH Puma CVX / CVT Series (165, 180, 195, 210, 225)
• Case IH Maxxum CVT Series (110, 120, 130)

1. 1

   Use the Case IH EST software or the tractor's onboard diagnostic display ('H9 - VOLTMETER' menu) to verify the operation and voltage supply of the MFH switches. Monitor the 'MFH - CVT range increase switch' state while pressing the button to see if the module registers the input.

2. 2

   Check the Range Plus button on the Multi-Function Handle for physical damage, sticking, or debris.

3. 3

   Inspect the wiring harness connecting the Multi-Function Handle to the Armrest Control Module. Look for chafed wires, loose connector pins, or corrosion that could cause an open circuit or short.

1. 1

   Park and disconnect battery

   Park the tractor on a level surface, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Remove trim panels

   Remove the necessary trim panels on the Multi-Control Armrest to access the base of the Multi-Function Handle (MFH) and the Armrest Control Module (ACML) wiring.

3. 3

   Disconnect MFH

   Disconnect the electrical connector for the MFH.

4. 4

   Inspect and repair wiring

   Inspect the connector pins for damage. If the wiring harness is damaged between the joystick and the module, repair the affected wires.

5. 5

   Replace MFH

   If the wiring is intact but the switch fails the diagnostic voltage/continuity test, the switch itself has failed. Because the buttons are integrated into the handle assembly, the entire Multi-Function Handle (MFH) must be replaced.

6. 6

   Install new MFH

   Install the new MFH assembly and route the wiring harness securely.

7. 7

   Clear fault codes

   Reconnect the battery, power on the tractor, and use the EST or diagnostic menu to clear the stored fault codes.

8. 8

   Test switch

   Test the CVT Range Plus switch to ensure the transmission responds correctly and the code does not return.