MoTeC MDC2 - Manual (Page 7)

MoTeC MDC2 5 Functionality
Hydraulic Pressure Pump Control
The MDC2 reads the hydraulic pressure sensor and controls the pump to maintain hydraulic pressure for the
ACD. The MDC2 implements the following strategies to protect the pump from being overrun and burnt out:
• If the pressure sensor is faulty or missing then the pump is turned off and remains off until the pressure
sensor reads a valid reading.
• If the pump has run for more than 20 seconds without achieving at least the low pressure threshold, the
pump is turned off for 20 seconds and a fault is indicated by a flashing mode indicator light.
• The pump will never run when the 0% lock mode has been selected
Hydraulic Pressure Pump Priming Mode
The hydraulic pressure pump priming mode allows the pump to be run manually by a technician during priming of
the hydraulic system.
To enter the pump priming mode, the steering wheel ACD switch should be held in the up position while turning
on the ignition, and then remain held for five seconds. The top line of the dash display will cycle between
TARMAC, GRAVEL and SNOW when the priming mode is active.
When priming mode is active, the diff lock is set at 50% and the hydraulic pump is run while the throttle pedal is
pressed down.
To exit the pump priming mode, the ignition should be turned off.
NOTE: The pump prime mode should be used with care by experienced technicians only. The MDC2 does NOT
restrict pump run time or hydraulic pressure during pump prime mode.
Communications
Main Vehicle CAN Bus
The MDC2 communicates at 500kbit/sec on the main vehicle CAN bus. This CAN bus is used for communication
to other vehicle systems, for MDC2 status transmission and for communication with a PC for MDC2 configuration.
A summary of the CAN bus usage is shown below:
Received Data Source Usage
Throttle Position Factory ECU or MoTeC
M800 ECU MDC2 control strategies
Brake pedal Factory Body Computer MDC2 control strategies
Handbrake Factory Body Computer MDC2 control strategies
Wheel Speeds ABS MDC2 control strategies
ECU Efficiency MoTeC M800 ECU MDC2 control strategies (optional)
Engine Temperature MoTeC M800 ECU Dashboard temperature display
RPM MoTeC M800 ECU Dashboard tacho control
Thermo Fan Speed MoTeC M800 ECU Thermo fan control
ECU Temperature MoTeC M800 ECU Thermo fan control
MDC2 Configuration PC (via MoTeC UTC) Configuration from MDC2 Manager
MDC2 Firmware PC (via MoTeC UTC) Firmware upgrade from MDC2 Manager