Tech II vs MDI
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Cadillac Powertrain Control Module (PCM) Tuning Discussion, Tech II vs MDI in Cadillac Engine Technical Discussion; The Tech II will not work on some 2009 GM vehicles. The MDI is replacing the Tech II. The MDI ...
  1. #1
    AJxtcman's Avatar
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    Tech II vs MDI

    The Tech II will not work on some 2009 GM vehicles. The MDI is replacing the Tech II. The MDI works with a Laptop. It is just a linking device between the vehicle and the Laptop. The MDI is a wired or wireless device. I can place the MDI in a vehicle in the parking lot and communicate with with it on my PC.

    When GM told us about this device they said that it would be released as a Diagnostic and Programming device.
    They released some information about a year later telling us that they were having problems with the Hardware for 1995 and prior OBD I vehicles. This was holding them up from releasing ALL Diagnostic Software. WFT who cares! Give me the OBD II stuff!

    Rumor has it that we will be getting the Diagnostic Software Soon.

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    AJxtcman's Avatar
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    Re: Tech II vs MDI

    January 2007
    For the past two years, dealers have been encouraged to support the Multiple PC Initiative (MPI), which calls for having one PC for each two technicians. A special thanks to all the dealers who have made the necessary investment; the results are very impressive.

    Because dealers have taken that important first step, Service Operations can now take the next step -- to provide low-cost programming capability at each of those PCs. An added bonus is that diagnostics will soon be available at each PC as well.

    There has been speculation for years about the “Tech 2 replacement.” Plain and simple, the Tech 2 is not being replaced in the near future, but there is a new piece of equipment coming out to work alongside the Tech 2. The new equipment takes advantage of all those new PCs installed in the service bays under the Multiple PC Initiative, and it is important news.

    The GM Multiple Diagnostic Interface (MDI) EL-47955 is being shipped to NAO dealers during the second quarter of 2007, one per dealer (fig. 1).


    TIP: Additional tools can be ordered by calling 1.800.GMTools, using prompts 1 or 4.

    What is the GM MDI?

    The GM MDI is a compact communication module that manages the transfer of data between a vehicle’s onboard ECU network and a PC.

    The EL-47955 MDI is a kit of components


    A GM MDI

    B J1962 Diagnostic connector

    C USB cable

    D Ethernet cable

    E AC adapter/power supply

    Wireless interface

    AAA batteries

    Owner manual

    Operating software for the MDI will be downloaded from the TS2WEB website.

    The GM MDI allows the user to perform Pass-Thru programming procedures using software running on a laptop or desktop PC.

    TIP: Any PC can be used, so long as it meets the PC Hardware Specification located at this link:
    http://www.gmde.net/standards.cfm
    (in Canada, review GM Dealer Infrastructure Standards located on the GM infoNET).


    Benefits of the GM MDI
    Today, the dealer cost to equip a technician to diagnose and reprogram vehicles is $2880 USD (Tech 2 and CANdi). When software coverage on the GM MDI is fully operational, all diagnostic and reprogramming for GM vehicles globally will be supported with this one piece of hardware at a dealer cost of less than $800.00 USD.

    The GM MDI offers faster programming speed at a lower cost. Depending on vehicle architecture (protocols/modules), the GM MDI can be 20-70% faster than the Tech 2. This helps alleviate vehicle battery drain problems during programming.

    Using the GM MDI for programming also frees up your Tech 2 for diagnostics and other tasks.

    No additional PCs are needed. PCs that have been installed under the Multiple PC Initiative (MPI) meet the PC Hardware Specification when using the GM MDI.


    What Protocols does the GM MDI Support?
    For immediate use -- At present, vehicles have two buses on the 16 pin connector (high speed and low speed GMLAN). The GM MDI communicates using all of the existing GM protocols, the same as the Tech 2:

    - UART

    - Class 2

    - KWP2000

    - GMLAN (CAN)

    For future use -- Global architecture coming in July 2008 for MY 2009 will use a total of 4 GMLAN links. (This is a limited rollout in MY 2009.) Global architecture adds a medium speed bus and an expansion bus. The Tech 2 and CANdi module can run only low and high speed, and won’t work on the 4 GMLAN link system for diagnostics or programming. The MDI will have this capability.


    How is the GM MDI Connected?

    The GM MDI will be connected between the vehicle and the PC using the DLC and cable.

    Connection between the GM MDI and the PC can be accomplished several ways.

    - using the supplied cable to connect the mini USB port on the GM MDI and the USB port on the PC

    - using a standard CAT5 cable to connect the Ethernet port on the GM MDI and the Ethernet port on the PC

    - using the WLAN card built into the GM MDI to communicate with the PC through the dealership’s wireless network

    MDI connections -- bottom


    A Trigger switch connector

    B Vehicle Interface connector

    C Power connector (AC adapter)

    MDI connections -- top


    A Mini USB connector

    B Ethernet connector

    The GM MDI is powered through the DLC when connected to the vehicle. In addition, it has 4 AAA batteries for backup. The unit can also be powered using the provided AC adapter plugged into any 120V AC electrical outlet.

    Detachable port covers protect these connectors:

    - Mini USB

    - Ethernet

    - Trigger switch

    - Power

    What are the Features, Controls and Indicators of the GM MDI?

    The GM MDI has an easy to grip, comfortable, rugged enclosure. Rubber end covers offer extra shock resistance.

    MDI controls




    A On/off switch

    B Status LEDs

    C Vehicle Interface cable

    A row of LEDs is located adjacent to the on/off power button to provide information about status and operation.

    How Will the GM MDI be Used?

    The GM MDI is initially being introduced with Pass-Thru programming capabilities only. It can be used to perform Pass-Thru programming on all vehicles built since 1993 and will support all vehicles into the future.

    The GM MDI will be required to perform diagnostics on selected NAO vehicles for model year 2009. Diagnostic software is scheduled to be released for the GM MDI during the fourth quarter of 2008.

    When diagnostics are introduced, the MDI will also get a remote data record capability. This permits recording data during a road test, similar to the Tech 2 Snap Shot function. A trigger switch connector is provided for this purpose.

    Regulations require programming procedures to be compliant with SAE Recommended Practice J2534. The GM SPS is compliant with SAE Recommended Practice J2534, and the GM MDI is compliant with the portions of SAE J2534 that are applicable for GM vehicles.

    The Future of the Tech 2

    The Tech 2 remains an essential tool through at least the 2010 model year. The GM MDI will not support past models when its diagnostic capabilities are introduced. And, the Tech 2 will continue to be needed to diagnose all vehicles from previous model years.

    Remote programming with the Tech 2 will continue to be supported for use on all 2007 and previous vehicles.

    Additional information will be supplied in future TechLink articles and dealer communications.

    - Thanks to Mark Stesney

    REMOTE vs. PASS-THRU PROGRAMMING

    Until now, you have been able to choose between two methods when programming a vehicle: Remote and Pass-Thru.

    Briefly, in the Remote method, you connect the Tech 2 (and CANdi module if necessary) to the vehicle to obtain necessary information. Then, you disconnect the Tech 2 from the vehicle and connect it to the TechLine terminal to download the necessary programming into the Tech 2. Finally, you connect the Tech 2 to the vehicle a second time, to download the programming to the vehicle.

    In the Pass-Thru method, the Tech 2 remains connected to the vehicle and to the TechLine terminal for the entire process. The TechLine terminal passes the programming through the Tech 2 into the vehicle.

    Beginning with the 2008 model year vehicles, Pass-Thru will be the only programming method available. (Remote will continue to be available for previous vehicles.)

    The new GM MDI can be used only in the Pass-Thru method. This means you can use it as your programming tool, while your Tech 2/CANdi remains available for diagnostics and other duties.

  4. #3
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    Re: Tech II vs MDI

    June 2007

    The GM Multiple Diagnostic Interface (MDI) EL-47955 is being shipped to NAO dealers the third quarter of 2007, one per dealer.



    The January 2007 issue of TechLink introduced you to the new GM MDI. It is a compact communication module that manages the transfer of data between a vehicle’s onboard ECU network and a PC. When software coverage on the GM MDI is fully operational, all diagnostic and reprogramming for GM vehicles globally will be supported with this one piece of hardware.

    TIP: Additional tools can be ordered by calling 1.800.GMTOOLS (1.800.468.6657), using prompts 1 or 4.

    WHAT'S INCLUDED WITH THE GM MDI?

    The EL-47955 GM MDI is a kit of components



    A GM MDI

    B J1962 Diagnostic connector

    C USB cable

    D Ethernet cable

    E AC adapter/power supply

    Wireless interface

    AAA batteries

    Owner manual

    The initial operating software for the MDI is included on a CD. Future updates will come from the TIS2Web application.

    HOW WILL THE GM MDI BE USED?

    Beginning with the 2008 model year vehicles, Pass-Thru will be the only programming method available. (Remote will continue to be available for previous vehicles.)

    The new GM MDI can be used only in the Pass-Thru method. This means you can use it as your programming tool, while your Tech 2/CANdi remains available for diagnostics and other duties.

    The GM MDI is initially being introduced with Pass-Thru programming capabilities only. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and will support all vehicles into the future.

    The GM MDI will be required to perform diagnostics on selected NAO vehicles for model year 2009. Diagnostic software is scheduled to be released for the GM MDI during the fourth quarter of 2008.

    Regulations require programming procedures to be compliant with SAE Recommended Practice J2534. The GM SPS is compliant with SAE Recommended Practice J2534, and the GM MDI is compliant with the portions of SAE J2534 that are applicable for GM vehicles.

    WHAT PROTOCOLS DOES THE GM MDI SUPPORT?

    For immediate use -- At present, vehicles have two buses on the 16 pin connector
    (high speed and low speed GMLAN). The GM MDI communicates using all of the existing GM protocols, the same as the Tech 2:

    - UART

    - Class 2

    - KWP2000

    - GMLAN (CAN)

    For future use -- Global architecture coming in July 2008 for MY 2009 will use a total of 4 GMLAN links. (This is a limited rollout in MY 2009.) Global architecture adds a medium speed bus and an expansion bus. The Tech 2 and CANdi module can run only low and high speed, and won’t work on the 4 GMLAN link system for diagnostics or programming. The MDI will have this capability.


    There are three ways to connect your GM MDI to the PC that will be delivering your reprogramming events. They are:



    A Mini USB connector

    B Ethernet connector

    1. USB version 1.1/2.0

    - Connected directly to your PC or laptop for first-time setup

    - Advanced configuring

    - Updating MDI software

    - Programming or future diagnostics

    TIP: Any PC can be used, so long as it meets the PC Hardware Specification located at this link: http://www.gmde.net/standards.cfm.

    IMPORTANT: If you choose one of the following two advanced connection methods, refer the task to your dealership's IT specialist.

    2. Wired Ethernet 10/100/1000

    - Connected to the service LAN for programming or future diagnostics

    3. Wireless Ethernet 802.11 B/G

    - Connected to the service LAN for programming or future diagnostics

    You will use the USB connection as the initial connection to set up your MDI and to configure the other two optional connections. You can also reprogram with this connection.

    Deciding Which Connection to Use

    The USB connection is limited to about 10 feet of cable. To obtain a greater distance from the PC to the MDI, you will need to use wired Ethernet or wireless Ethernet. If you don’t have a wireless access point in your shop, you will probably use the wired version.

    In order to use these other options, some additional equipment may need to be obtained.

    To use wired Ethernet, you will need:

    1. Cat 5e or Cat 6 Ethernet cables

    2. An open RJ45 port that connects to the service LAN

    or

    3. An unmanaged switch (see table)

    4. Additional IP addresses from your Dealer Management Service if they are required. (This may be required for static IPs only.)

    The unmanaged switch must be placed in a location with convenient access to a plug and the MDI Ethernet cable. Your shop may already have such a device and all you need to do
    is plug into it. This switch must be on the same network as your MPI PC or your service network. This is where your programming information will come from.

    SUPPORTED SWITCHES

    Linksys 8-Port 10/100 Switch
    Model No. SD208
    HP ProCurve 8-Port Switch 408

    Linksys 16-Port 10/100 Switch
    Model No. SD216
    HP ProCurve 24-Port 1400-24G


    To use a wireless access point, you will need:

    1. Wireless access point (see table)

    2. Cat 5e or Cat 6 Ethernet cables

    3. Additional IP addresses from your Dealer Management Service if they are required.
    (This may be required for static IPs only.)

    SUPPORTED ACCESS POINTS

    Cisco 1100 Series

    HP ProCurve Wireless 420
    - Thanks to Matt Singer and Mark Palmer

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    Re: Tech II vs MDI

    I have personally sold one to a Tuner

    I will post some more on this.

  6. #5
    N0DIH's Avatar
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    Re: Tech II vs MDI

    Cool, thanks!

    I need to get me one.... Well, ok, don't NEED (yet), but want!

  7. #6
    AVNET is offline Cadillac Owners Member
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    Re: Tech II vs MDI

    Hello,

    I would exchange my Tech 2 to MDI. Anyone interested contact me, please
    service@radiolinija.com

    Regards,
    Paulius

  8. #7
    N0DIH's Avatar
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    Re: Tech II vs MDI

    What does it come with? CANDI, memory card(s)?

    Thanks!

  9. #8
    wait4me's Avatar
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    Re: Tech II vs MDI

    Global tech has been put on line to dealers now for use of the mdi for diagnostics.

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