MDC2 Mitsubishi Diff Controller User Manual © Copyright – MoTeC Pty Ltd – 2001-2009 The information in this document is subject to change without notice. While every effort is taken to ensure correctness, no responsibility will be taken for the consequences of any inaccuracies or omissions in this manual.
Contents Introduction .........................................................................1 MDC2 Functionality ............................................................2 Mode selection ................................................................................................... 2 Lock Calculation ................................................................................................. 2 Slip Control .......................................................................................
MoTeC MDC2 1 Introduction Introduction The MoTeC Mitsubishi Diff Controller 2 (MDC2) is a direct replacement for the Active Centre Diff (ACD) controller in the Mitsubishi EVO X. The MDC2 also supports centre diff control on Active Yaw Control (AYC) equipped vehicles however the yaw control hardware is not used. This manual covers the installation, configuration and functionality of the MDC2.
MoTeC MDC2 2 Functionality MDC2 Functionality Mode selection There are six user selectable control modes, four of which are user configurable. The control modes can be selected using the ACD toggle switch on the steering wheel. The current mode is indicated in the top line of the dash centre display. Optionally, three mode lights (SNOW, TARMAC and GRAVEL) can be wired directly to the MDC2 if the dash display is removed.
MoTeC MDC2 3 Functionality The lock percentage for the constant lock mode is determined according to the following strategy: Const ant lock % Handbrake OFF 0% Lock ON % lock The constant lock % is equivalent to the maximum lock achieved by the Mitsubishi factory AYC / ACD controller. The lock percentage is always 0% in the 0% lock mode. Note: The handbrake status is ignored during a handbrake start from 0km/h – See Handbrake Override below.
MoTeC MDC2 4 Functionality When wired directly to the MDC2, the wheel speed inputs can be configured as hall effect or magnetic sensors with adjustable thresholds, and individual sensors can be enabled or disabled. Magnetic sensor input thresholds are individually configurable for front and rear sensor pairs according to the current front and rear speeds. The speed calibration can be adjusted for different wheel sizes and sensor teeth.
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.
MoTeC MDC2 6 Functionality Transmitted Data Target Usage Tacho position Dashboard Tacho based on M800 ECU RPM Temperature Display Dashboard Temperature display based on M800 ECU engine temperature Thermo Fan Speed Body Computer Fan control (high or low speed) based on M800 ECU requested thermo fan speed and M800 ECU internal temperature Diff Control Mode Dashboard MDC2 mode display (TARMAC etc.
MoTeC MDC2 7 Functionality Miscellaneous functions Fault indication Faults are indicated by flashing the following message on the dash centre display. This display will continue to flash until there have been no faults present for 2 seconds. Fault codes and diagnostic codes are included in the CAN diagnostic messages, as described in Appendix A – Fault Codes.
MoTeC MDC2 8 Setup MDC2 Manager The MDC2 Manager software is necessary to configure an MDC2 unit from a PC. A new MDC2 unit must be configured before its initial use. Computer requirements The MDC2 Manager software runs under Windows 95, 98, ME, NT4, 2000 or XP operating systems. The minimum recommended PC specification is a Pentium 90 with 16MB RAM and a parallel port or USB port.
MoTeC MDC2 9 Setup The Braking table is used to generate the %lock when the foot brake is applied, and is an override table for the Acceleration table values. If a cell in the braking table is left blank, the corresponding cell value from the Acceleration table is used. Cell values should only be entered into the Braking table where a different value is required from the Acceleration table.
MoTeC MDC2 10 Setup Speed Sensor For Wheel Speed speed measurement method only. Hall/Magnetic: If the speed sensor type is hall effect (or equivalent), a hall switching threshold must be specified. If the speed sensor type is magnetic, the Magnetic Levels table (on the Input Tables tab) must be configured. Factory default is Hall. Hall threshold: The switching threshold for hall effect speed sensor inputs. Factory default is 2.2V.
MoTeC MDC2 11 Setup File | Setup | User Modes Lock Table Axis The Y-axis of the user mode lock tables is configurable as Throttle Position or ECU Efficiency. The ECU Efficiency option should only be used when the vehicle is fitted with a correctly configured MoTeC M800 ECU. See Appendix D – ECU Communications for more details.
MoTeC MDC2 12 Appendices MDC2 Installation The MDC2 is fitted in pace of the factory AYC / ACD ECU underneath the dashboard. To install the MDC2, remove the entire factory AYC / ACD ECU bracket and unclip the plastic case from the bracket. The MDC2 can be attached to the bracket with double sided tape or Velcro™ before the bracket is reinstalled.
MoTeC MDC2 13 Appendices Appendices Appendix A – Fault Codes The MDC2 fault flags included in the CAN diagnostics are sent as a bit field (16 bit) with the following faults: Bit 0 (0x0001 = 1) Bad Configuration (CRC failure) Bit 1 (0x0002 = 2) Short circuit pump output Bit 2 (0x0004 = 4) Hydraulic pressure sensor failure Bit 3 (0x0008 = 8) Pump run time fault (pump could not achieve min pressure threshold) Bit 4 (0x0010 = 16) Wheel speed CAN messages (from ABS) timed out Bit 5 (0x0020 = 32) Ha
MoTeC MDC2 14 Appendices Appendix B – MDC2 Pinout and Links MDC2 Connector Pinout 1 2 3 4 5 6 7 8 9 10 11 12 13 31 32 33 34 35 36 37 38 39 40 41 14 15 16 17 18 19 20 21 22 23 24 25 26 42 43 44 45 46 47 48 49 50 51 52 The 26 pin MDC2 connector connects to the factory wiring loom. The 22 pin MDC2 connector offers inputs and outputs for custom wiring such as direct wheel speed inputs.
MoTeC MDC2 15 Appendices Appendix C – CAN Wiring Practices A CAN bus should consist of a twisted pair trunk with 100R (0.25Watt) terminating resistors at each end of the trunk. The preferred cable for the trunk is 100R Data Cable but twisted 22# Tefzel is acceptable. The maximum length of the bus is 16m (50ft) including the MoTeC CAN Cable (PC to CAN Bus Communications Cable) CAN Devices (such as MoTeC ADL, M800 etc) may be connected to the trunk with up to 500mm (20in) of twisted wire.
MoTeC MDC2 16 Appendices Appendix D – ECU Communications The MDC2 communicates with the factory ECU or a MoTeC M800 ECU using the main CAN bus. When used in conjunction with an M800 ECU the MDC2 controls the thermo fan, the tacho and the dash temperature gauge based on data received from the M800.
MoTeC MDC2 17 Appendix E – CAN Messages The MDC2 communicates on the main CAN bus running at 500kbit/s. MDC2 operational data messages are each transmitted at 50Hz. MDC2 diagnostic messages are each transmitted at 25Hz. 50Hz Messages CAN ID 0x1F4 Byte Data 0 Compound Id = 0 1 Diff Current Average (0.01A resolution) 2 Vehicle Speed (0.1 km/h resolution) 3 4 Front Wheels Speed (0.1 km/h resolution) 5 6 Rear Wheels Speed (0.
MoTeC MDC2 18 CAN ID 0x1F4 Byte Data 0 Compound Id = 4 1 2 Diff PWM duty (0.1% resolution) 3 4 Front Right Wheel Speed (0.1 km/h resolution) 5 6 Front Left Wheel Speed (0.1 km/h resolution) 7 CAN ID 0x1F4 Byte Data 0 Compound Id = 5 1 2 Slip Control Percentage Diff Lock (0.1% resolution) 3 4 Rear Right Wheel Speed (0.1 km/h resolution) 5 6 Rear Left Wheel Speed (0.1 km/h resolution) 7 25Hz Messages CAN ID 0x1F5 Byte Bits 0 4..7 0..4 1 2 3 4 5 6 7 CAN ID 0x1F5 Byte Bits 0 4..7 0..
