Merlo 12–15 – MD-CODER: Resistance Out of Range / Short Circuit

The MD-CODER control system has detected a resistance out of range or a short circuit in one or more potentiometers (specifically Potentiometers 1-4). This indicates a fault in the wiring or the component connected to the circuit, which are typically associated with operator controls such as the joystick axes or the accelerator pedal.

• Telehandlers (MD-CODER V1.25 - V1.40+)
• ROTO systems (MD-CODER V1.25 - V1.40+)

1. 1

   Ensure a stable power supply to the control system

2. 2

   Visually inspect the wiring and connectors leading to the joystick and pedal potentiometers for any visible signs of damage, loose connections, or corrosion

3. 3

   Check the CAN bus lines and connectors, as CAN errors can sometimes cause erroneous potentiometer fault codes

4. 4

   Connect MerloDiag software to read the fault data and identify exactly which potentiometer (1-4) is failing

1. 1

   Identify faulty potentiometer

   Use the MerloDiag software to determine which of the four potentiometers (1-4) is logging the error.

2. 2

   Recalibrate potentiometer

   Attempt to recalibrate the affected potentiometer using the diagnostics menu in the MerloDiag software.

3. 3

   Replace potentiometer

   If recalibration fails to resolve the issue, replace the faulty potentiometer. Note that on some models, joystick replacement can be a direct swap-out without the need for recalibration.