Case IH 18332 (4165.02, 4165.03, 4165.04, 520625.07) - ACML – Armrest Control Module (ACM / ACML): MFH Forward Switch ACML - error state

The control system has detected an invalid, missing, or implausible signal from the Forward Switch located on the Multi-Function Handle (MFH). The system is unable to verify the switch's position due to an electrical fault, placing the switch into an error state.

• MAXXUM T4E
• VESTRUM CVX
• Case IH Puma 140
• Case IH Puma 165
• Case IH Puma 180
• Case IH Puma 190
• Case IH Puma 195
• Case IH Puma 200
• Case IH Puma 210
• Case IH Puma 215
• Case IH Puma 225
• Case IH Puma 230
• Case IH Magnum 235
• Case IH Magnum 260
• Case IH Magnum 290
• Case IH Magnum 340
• Case IH Steiger Series

1. 1

   Enter the 'H5' diagnostic menu on the tractor's display, navigate to channel d137 (MFH - Forward switch), and toggle the switch to see if the module registers the state change

2. 2

   Use the 'H9' Voltmeter Diagnostic menu to verify the voltage supplies and check for intermittent faults in the MFH circuits

3. 3

   Inspect the wiring harness and connectors between the Multi-Function Handle and the Armrest Control Module for pinched wires, loose pins, or corrosion

1. 1

   Power Down

   Turn the ignition key switch OFF and ensure all power is disconnected before servicing the armrest.

2. 2

   Access the ACM/MFH

   Remove the necessary trim panels on the MultiControl armrest to access the base of the Multi-Function Handle and the Armrest Control Module.

3. 3

   Inspect and Test

   Disconnect the MFH harness. Use a multimeter to test the continuity of the Forward switch pins while actuating the button.

4. 4

   Replace Component

   If the switch fails the continuity test, the switch/handle assembly must be replaced (the forward switch is typically integrated into the MFH assembly and not serviced individually).

5. 5

   Clear Fault Codes

   After reconnecting the new handle, turn the key ON. Enter the 'H' menu. Navigate to the error codes screen. Hold down the 'm' / 'Decr' key; the display will scroll through '05, 04, 03, 02, 01, EE' and beep to confirm the errors are cleared.

6. 6

   Recalibrate

   Depending on the tractor model, run the transmission/armrest calibration procedure to ensure the new MFH is recognized correctly by the ACM.