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MHYRIO LOGIC UNIT
Concerning this session, in the “Condition for error detection” description, if not expressly specified, the
wording "logic unit" refers to the MHYRIO LOGIC UNIT.
A1 EEPROM KO
Condition for error detection
Fault in the area of memory in which the adjustment parameters are stored; this alarm inhibists the truck
operation; the logic unit will use default parameters.
If the fault persists when the machine is switched on, carry out a card RESET from the display. If the
problem persists replace the logic unit.
If the alarm disappears, remember that the parameters previously stored have been deleted and
replaced with the default values.
A2 EV DRIVER SHORT
Condition for error detection
It is referred to the 5th way.
Check:
• Wiring harness continuity
• Presence of false contacts on connectors on the MHYRIO and solenoid valve sides
• State of coils EV9 and EV10
• Replace the logic unit.
Reference wiring diagram page 4/7 (chapter 17, section WIRING DIAGRAMS)
A3 CAN BUS KO
Condition for error detection
Failure of the can bus comunication. This alarm appears if the lifting logic unit does not receive
information from the I/O board or the traction logic unit or the arm rest card.
Before to replace every board, verify:
- The dashboard alarms, to identify exactly the board that does not comunicate
- Enter the SOFT VERS menu to see which card is not present on the can-bus line
- Can-bus pull-up resistance presence
• dashboard 180 Ohm
• MCB 180 Ohm
• armrest 180 Ohm
https://www.forkliftpdfmanuals.com/
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