Case IH 522807.02 - ACML – ACML: Stack checks, unexpected value

The module's software encountered erratic, intermittent, or incorrect data while evaluating its memory stack. This is typically an internal software glitch or a memory failure within the module itself.

• MAXXUM T4E
• VESTRUM CVX
• Magnum
• Steiger
• Puma

1. 1

   Connect an appropriate Case IH Electronic Service Tool (EST) to verify if the code is active or stored

2. 2

   Test the EHR (Electro-Hydraulic Remote) levers and armrest dispenser controls to see if they are functioning properly or if they are locked out due to the fault

3. 3

   Check if there is a software update available for the ACML, as this is a memory/software error

4. 4

   Do not just clear the code without addressing the root cause, as it may lead to ongoing issues

1. 1

   Power Cycle / Hard Reset

   Disconnect battery power to perform a hard reset of the tractor's modules, which can sometimes clear temporary memory stack faults.

2. 2

   Software Flash

   If the code returns, use the Case IH diagnostic tool to reflash or update the ACML software.

3. 3

   Module Replacement

   If the software update fails or the code persists as a hard fault, replace the faulty armrest control unit/valve controls.

4. 4

   Recalibration

   After replacing the ACML, calibrate the armrest controls and EHR levers using the manufacturer's diagnostic tool.