Tech 2 purchased- quality as my original, works good

Tech 2 review: (credits to David)

My overall impression after playing with the Tech 2 scan tool for a few days- This thing is cheap, works great, and is of the same build quality as my original. Some of the few differences that I immediately noticed are the buttons feel different and the screen is much brighter. The buttons on my original have a distinct “click” feel to them, and the clones are mushy. However I found that the more that I press them, the clickier they get. The screen being brighter is a plus.

I just did a “Fast-Learn” on a G8’s 6L80E last week with mine. A Snap-On MODUS was not able to do this. There are simply factory diagnostic procedures that a Tech 2 can do on GM vehicles that no other tool can. But yes, to reflash PCM’s, TCM’s, etc, you need to have authorization from the Tech Center, which means you have to be a dealership or a paying subscriber to the service which is a serious chunk of $$$$.

I reflashed my ecm. only have to buy the 55 dollar three day access. the Car Diagnostic Tool tis2000 software to flash, and the dongle key to unlock the functions to flash is and extra 25 dollars, and that was why my tech 2 cost me 325. cause i bought the software and dongle with it.

With that said, Bosch (who now owns the rights to GM Tech 2’s as they purchased out Vetronix), will not support the unit because it’s a factory knock-off. So should you have to replace the VCI module (I’ve had to replace mine due to wear and tear on the connection where it damaged the motherboard inside), or any other necessary repair.

Also, Obd2 tool Tech 2’s can only be updated through 2009 MY vehicle info, was my understanding from GM. For 2009+ GM has gone to a new setup called MDI. MDI is backwards compatible with pre-2009 GM vehicles (it even has the software on the screen to emulate the screens you’d see on the T2).

GM Tech2 Service Programming what is required

To perform service programming with GM Tech 2 Scan Tool, you need following:

1. Tech 2 scanner
2. 5 CDs (2 default CDs in package and 3 TIS2000 software CDs)

Tech2 User Manual CD

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GM tech2 default TIS2000 CD, no USB key, cannot program SPS

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3. USB key security dongle

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4. A RS232-DB9 adapter
5. Laptop/computer with COM Port
6. Connect RS232-DB9 adapter with Tech II

GM Tech2 scanner package without TIS2000 and USB key, cannot do service programming:

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How do I use GM TECH2 to replace Opel Corsa C ECU

This article is just sharing real experience when use GM Tech 2. Hope this helps someone.

I decided to invest in some tools to diagnose my Opel. After a couple weeks of searching all over ebay, aliexpress and other online store, I finally found the cheapest one on obd2tool.com, they were very fast to respond and answer all of my questions. I exchanged emails with Customer service for about 3 days before I finally decided to purchase a GM Tech 2 clone here. I ordered it on Tuesday and I picked it up at Friday (I missed the fed ex guy and you have to sign for it). Yes, it only took 3 days delivery!

I paid $349 for it. The quality of this is amazing. I would never be able to tell it was a clone. I hooked it up to my car and was able to replaces Opel Corsa-C ECU.

So here it is….

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Below is the procedure, I search and learn from forum members:

1. Obtain all ECU pin codes especially second hand ECUs (immobilizer or engine). Scan old ECU to obtain VIN code and then obtain car passes to match.
2. Obtain all keys they will be required at end of procedure. SPS program new engine ECU with vehicle engine code and VIN number.
3. Configure engine ECU CAN configuration (Engine/ programming/ program CAN configuration)
Configure engine ECU variant configuration (Engine/ programming/ program variant configuration)
4. Reset engine ECU if second hand ECU use pin code from car pass (body/ immobilizer / additional functions/ reset engine ECU)
Reset immobilizer (body/ immobilizer/ additional functions/ reset immobilizer)
Reset BCM (body/ BCM/ additional functions /reset BCM)
Reset instrument cluster (body/ instrument/ additional functions/ reset instrument)
5. Program immobilizer function (engine and immobilizer): this will program everything together includes new keys. Have all keys programmed (body/ immobilizer/ programming/ program immobilizer function).
Check and clear all fault codes Engine immobilizer dash BCM ABS and gearbox. Road test and recheck it.

Great! I can see automotive diagnostic equipment GM Tech 2 replace a new engine ECU for Opel Corsa C successfully!

GM Tech II Saab card not find Bus ECU but GM card Solution

Car model and year:

’03 Saab 9-3

Tools I own:

I finally decided to order a clone from seller Obd2tool.com. It arrived this week (Monday), complete with all of the bits and pieces it was supposed to have, including a Saab card and a GM/Chev card.

I bought GM Tech2 $252 from obd2tool.com:

Package with Saab Card, GM Card , TIS2000 and Candi interface

shown as following package picture:

gm tech2

OS and computer configuration:

I have XP running in a VM on my Thinkpad with Windows 7 Pro, and TIS2000 is talking just fine to the Tech 2 via the USB to 232 adapter.

Operation:

1.Saab card can’t find any kind of Bus, or ECU

I tried connecting it to my wife’s ’03 9-3, and no matter what I do, it just can’t see anything on the car – it can’t find any kind of Bus, or ECU. The reason I finally ordered the thing was to marry a new ECU to the car. My cheapo card reader reads DTC’s and other info from the car just fine. I have tried it with version 143 and 148 (I re-flashed the one card with different versions) – same result, no bus detected.

The car was running, but going into limp home before I replaced the ECU…

2.GM card works fine on my Express van

When I pop out the Saab card, put in the GM card, the Car Diagnostic Tool Tech 2 works fine on my Express van – I was checking out all kinds of things, reading live data from the engine, playing with the radio, no problem.

Solution:

Used the Candi interface on my Express van – it worked.

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How Sleek is Maxisys Pro Full Auto Diagnostic System

1.Smart Screen: Autel Maxisys Pro MS908P comes with a whopping 9.7 inches IPS LED-backlit capacitive touch-screen with resolutions of 1024 x 768 pixels. As a result, it provides ultra-clear display of contents, to the users, with glossy wide-screen. The screen also supports multi-touch. You can use up to 5 touches at the same time.

2.You can also enable a virtual on-screen keyboard with this device. It saves the space and gives wider display area.

3.Auto Focus Camera: The product comes with built-in 5 mega-pixel rear camera with a flash-light. The camera provide high-quality images as it has auto-focusing ability.

4.Quick Battery Recharge: The device has an 11000 mAH-3.7v rechargeable battery made up of lithium polymer. This ensures up to 8 hours of continuous operations. It takes just a couple of hours to recharge the battery that means another 8 hours of operations.

5.Super Fast Performance: The device runs on Android 4.0 Ice-cream Operating System with multi-tasking feature. The device has an extra-powerful Cortex-A9 Samsung Exynos 1.4 GHz quad-core processor providing unrivaled speed performance. The device system boot-ups in 20 seconds that is approximately 5 times faster than any other such product.

6.Big Storage Capacity: The diagnosing tool has 2 GB DDR-3 RAM that dumps huge amount of temp files and supports frequent live streaming. The dedicated RAM avoids the device-hang problem and ensures smooth operations. The 32 GB Internal Sata Hard Drives stores all the detailed history of your clients. 32 GB storage space is enough for medium and big repairing houses.

7.Lastest Technology: The Autel Maxisys Pro equips with the latest AutoVIN technology with advanced Auto-Scan functions to identify CAN-Enabled vehicles, in one touch. It displays the data in the form of text and graphs for efficient analysis. The device can be claimed as the most intelligent system as it scans all the diagnosable ECUs on vehicles. In the nutshell, it’s not just an engine scanner.

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8.Fast Data Transfer: The package comes with both dual band (2.4 GHz and 5GHz) 802.11n Wi-Fi technology and long range class 1 Blue-tooth connectivity that provides it’s users with an ultra fast Vehicle Communication Interface (VCI). You don’t have to wait. Just plug it into the OBD-II dashboard and it will diagnose with in seconds.

9.OE-Level Coverage: The device covers the most extensive OE-Level Diagnostics. It will save you the hassle of contacting the car dealer for any un-identified engine error. OE-Level library contains every possible error codes.

10.Reliable ECU Coding: The device comes with a coding function to track the vehicle control modules i.e. ECUs with some extra parameters. There is a provision for reliable coding and safe performing environment.

11.Future Proof: The Autel company frequently releases new versions of the software and engine code library that makes it compatible for newly launched vehicles. If any “Unknown” or “New Vehicle Found” error is reported, the custom software updates are made available to the users within 48 hours. It is like, every customer is treated like an elite by the company.

12.Lightweight & Compact Size: The total weight of the device is 28.9 Pounds. That makes it an easy to carry gadget. The product has been designed to be carried single handy yet it doesn’t mean it will fit in your pocket. In particulars, the product dimensions count as 9 inches in length 18 inches in width and 7.6 inches in height.

13.Additional Features: This professional engine scan tool has many other fabulous features such as 2.0 USB connector, microphone, dual speakers, 4-band 3.5mm audio jack, Accelerometer and Ambient light sensors, RJ45 Ethernet connection, 3G/4G compatibility, WDMCA module and many more. Also, it supports multi-languages including English, French, Spanish, German, Russian and Portuguese. What else are you looking for?

14.Remote Technical Support: “Autel” is known for it’s after sales services. If you face any problem with the device, just give them a call and a technician will be there to assist you. The technician can access your device remotely. That leads to faster resolutions and high satisfaction. The support is custom as well. If the device has a non-resolvable fault, a custom software upgrade or replacement is provided as long as the warranty is not void.

15. Free MaxiTPMS TS601 Testing Scanner with every purchase. It acts as a quick scanner or an additional scanner for your team mates.

16.Enables cloud-based data managing for saving records and notes. You can use any free cloud storage service as the files for scanned data are very small in sizes. Typically, in Killobytes.

How to use GM MDI interface for programming

GM has had its newest programming/J2534 Pass Thru device on the market for some years now. A lot has been said about it and I am here to tell you that I have finally taken the plunge into GM MDI in, pretty much, all of its aspects. I decided after taking it into the field for a while, it was time to report what I experienced and how I feel about MDI and its companion programs. It is a formidable diagnostic/programming system that has really benefited me more than it has impeded me. With just a few exceptions, this system has my stamp of approval. let me say right out of the gate that my intent is not to do anything but provide you with information that can be found on any of the literature that GM has provided for MDI, Tech 2 WIN and GDS II users. What I am offering you is a slightly more comprehensive report of these facts as I understand them, have experienced. Additionally, I am NOT an engineer before I am a vehicle technician and automotive trainer, thus my approach is view of a technician and trainer. Please feel free to email me with any information you think I may have missed or questions or comments you may have. This is how I continue to have guides like this evolve to help others.

The MDI interface

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First off, let’s talk about what GM MDI itself. The GM MDI which is an acronym for Multiple Diagnostic Interface. It is a very basic, yet very effective J2534 Pass-Thru unit that General Motors adopted several years ago. This was in lieu of the introduction of the Global Diagnostic System (GDS) and GDS II. This diagnostic software package is needed to be able to diagnose GM’s global A platform vehicles like Camaro, Equinox, Regal, Terrain, Cruze, and even the Volt. These vehicles will not communicate with the Tech II of yesteryear, thus they can neither be diagnosed, nor programmed with a GM Tech II. MDI provides the user with several well marked status lights for connectivity, and functionality. The MDI is also capable of operating wireless and as a network device as it comes from the factory with a removable wireless card. The MDI package also includes a network cable, DLC cable that looks similar to the Tech II DLC but is NOT the same. It comes with a very nice, long USB wire and a nifty connector protector device that prevents wear and damage to the end of the USB wire that connects to MDI. Included in the package is also an AC adapter with plug converters that allow for use worldwide as well as a quick-start CD with instructions and a “birth certificate.” The unit comes to you brand new in a “brain dead” state. This means that you need to start from scratch and download 100% of the software and drivers you need to operate the unit and its attributes. This means that you will need access to TIS to WEB to get this software, or a good reliable source outside of AC Delco. You can go out on places like GarageForum and down load software, but keep in mind that there are BAD people on the internet who sneak malicious software into downloads to steal your information off of your computer.

The MDI allows the user to operate his/her diagnostic programming on PC and use the MDI as its pass thru device and with the GDS II software, do pretty much anything on a Global A platform vehicle. One can, furthermore, program any controller on a Global A GM vehicle with the MDI, with the support of TIS to WEB. You can also program OBD II and all other CAN equipped GM vehicles through any mode you wish. Although there is currently no software flash programming on disc for Global A vehicles, all the flashes must be accessed on the World wide Web, just like all of Chrysler’s flashes, and in just a couple months, Ford will be doing this as well. As you will read, MDI will allow its user to interface with the antiquated, but very useful, TIS2000 program for GM pre-08 applications.

GDS 2 – At first blush, needs more work!

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The software that allows MDI to interface your PC to Global A cars is called GDS II. This program needs A LOT of work! It is not a very user friendly program that does not appear to have the technician in mind. It was clearly designed by engineers who seem to think cars are worked on by other engineers, not technicians. I have always found that the major disconnect between GM’s team that wrote this software and the end user will inevitably be the biggest criticism of this software diagnosing system. The program does not flow well and has a lot of disjointed functionality. Things are often difficult to find within the system and not always in the same places for all applications. Like a bad relationship with a spouse, you eventually settle into the program with experience, but I have not yet reached that point. I will provide more information and examples as I spend more time with GDS II.

Where does this leave Tech II? Lets talk about Tech II WIN

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MDI pretty much leaves the Tech II user in the same boat as the TIS2000 user. Although its still useful, it’s time has passed. For some years, it was necessary to have a Tech II in your stable for the older GM’s with simple CAN and OBD II but this too has clearly passed! Tech II is still useful for GM OBD I cars. For OBD II and newer cars, with the introduction of Tech II WIN, the MDI and your PC can be used to emulate a Tech 2 Scanner WITH CANDi right on your PC at about 100x faster than the old Tech II stand alone. Thus far, I have been able to do just about everything with the Tech II WIN program that I could do with my actual Tech II, but I have to honestly say, I have not yet done every single function on every model. Now you can do pretty much anything with your MDI you could do with your Tech II WIN program on GM NAO and a few other software packages. Tech2WIN will NOT, however, work with ALL the same applications as GM Tech2. Saab, for instance, will NOT work with Tech2Win. With that said….here comes the BAD news.

Tech2WIN is a great service to have, but consider that you dont own it! You just lease it from AC Delco. Once you get Tech2WIN downloaded, unpack the program and install it, there is a lot of stuff you have to do to make it useable. You need to obtain a security license off of TIS on WEB, than download the software package you want to use. It’s a huge hassle at first because the instructions are very poorly written and leave out a few key procedures on how to do this efficiently. You have to, furthermore, update the software every 30 days to keep it functional. Tech2WIN will work stand alone (with no connection to the internet) for only 30 days at a time. After that, you have to go through the update procedure again and download current software. Unlike how you do it with Tech 2 and your 32 Mb memory card, once you download, oh lets say, GM NAO software for Tech2WIN, you will see a counter in the lower right hand side of the screen on the program when you open it. It will begin at 30 and once it runs to 0, you need to get on line and download your software again as it will no longer work. If you are reading this and are thinking “OK so whats the big deal”? The big deal is that the software access package from AC DELCO on TIS to WEB that you need to get this updated software will cost you a minimum of $1400 bucks! You cant subscribe weekly or monthly, or even yearly unless you choose one of their more inclusive packages and get this service. With your old Tech2, you could download a version of Tech2 software and once a new version came out, you just got an annoying screen reminding you that there MIGHT be an update to your software. You can still use 100% of the software despite there being a slightly newer version. You can’t do this with Tech2WIN. Although the program itself is a great product, the cost of keeping it working makes it VERY hard for me to say that it will cause technicians who use Tech2 to flood onto Ebay or Craig’s list to sell off their Tech2’s. The unfortunate thing that will likely occur in time is that GM will begin to only offer updates that will work with Tech2WIN. This may occur simply because the 32 Mb card will soon not be able to hold all the information required to update Tech2. Once this happens, GM is not likely going to spend the money required to put out an updated card for an antiquated scan tool. This is all speculation, however, look to see a lot of good deals on Tech2’s on Ebay once this happens. One little tip I have gotten from my dealership buddies turned out to make a lot of sense. When I bought a used Tech2 on Craig’s list a few years ago, it had a software package from back to 2006 on the 10 Mb Card. I took it and threw it into my box of 10 Mb cards and OBD I cords and forgot about it. When I went to do some work on an 88 suburban, I couldn’t find some of the functions on my Tech2 that had current updating on it. I asked my buddy at the dealership who is pretty tech savvy and he told me that as GM puts out newer software for the latest models that are not Global A platform vehicles, they start pruning off software from the earlier models in the GM NAO software package. If you have access to an older version of NAO or know someone who has an old memory card with outdated software from pre-07, get a cheap 10Mb card, and use the utility on Tech2 and get yourself a copy to keep just in case you have to work on one of those old crusty GM’s. Its because of stuff like this that the 10Mb card is still a useful item as is the good old Tech 2 scan tool.

I can, however, say with some confidence…………………

Tech II is on life support!

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When GM went to the world wide web back in 08 and away from TIS2000, the Tech II’s days became numbered. They have been very nice about making it possible to use Tech II well into the current day, but with the growing number of Global A cars on the road, Tech II is about to find itself on the shelf along with TECH I. The good news for us veterans that In addition to Tech II WIN allowing us to have the comfort of Tech II on our PC, for those of us who still use TIS2000 software, it is about as easy as pie to configure TIS2000 to work as a pass thru unit with TIS2000 directly. What this means is that you can simply put MDI on your menu of units that you are programming with using TIS2000 and program all of the old school GM’s all the way back to OBD II with MDI and TIS2000. Sure, you wont be able to get the most current programing that you can get on line, but when you don’t have access to the internet, and doing an older pre-08 GM family car, you wont be left in a lurch if you have TIS2000 loaded on your PC. Lots of people say “why in the hell would anyone want to use flashes that are over 4 years old on TIS2000? My response is almost always “because not everyone has access to the internet in the front seat of a car on a car lot,” or “some people simply cant afford to buy access to TIS on WEB for the few times they need to replace a late model GM Tool.” There are lots of reasons why people need to have flash programing resident to their PC, as opposed to having to go out on line to get it. Than there is the economic reality of the situation folks. Up here in the lawless badlands of Detroit where at least 90% of the cars finding themselves in repair shops are non Global A vehicles, and pre 08 GM’s, TIS2000 is still an extremely useful entity.

The fact that you are reading this means that you are likely looking to invest in such a unit, or already have one and need more background. Keep in mind that for every piece of new technology that comes down the pike, there is gong to be some clown trying to copy it and for less money and sell it to you. This would be just great if they were more up-front about it, but instead, they act like they are selling you an authentic unit, or a BETTER than authentic unit for far less money than an authentic unit. Sure, I have read about lots of folks on GarageForum who use clone VCM units and seem to have great luck with them. For every one of those stories, I hear and see hundreds of others who got a piece of complete garbage from some Ebay rip off artist who sold them on the idea that somehow anything that comes out of China or Korea is something other than crap! Keep in mind that all of those folks who spent money on VCM units out of Asia thinking that they would cheat the system and be able to operate with impunity and for free are now coughing up even more now than they would have before (at least until someone figures out how to rip off the IDS software and un-lock it without paying). It is people like this who cost everyone more money in the long run because Motorcraft, like AC Delco and Witech, will spend millions to protect their software from piracy, and the rest of us will pay for it in higher prices for it. I am the last person in the world that will preach about software piracy as I encourage others to share software, however, with hardware, we are in a completely different boat. Clone hardware is RARELY well worth the investment and 95% of the time, ends up a total loss. Good luck finding the 5% that actually works well and has longevity. The only people who think Chinese or Eastern European Clone tools work well are the people who were stupid enough to buy them and almost always regret it as the solder melts away with nominal use or future program upgrades wont work on them and renders their clone crap useless! I have a clone FORD VCM on my bench right now that actually has mold growing on one of the circuit boards from the acid core solder they used to build it in China. It ate through the laminate on the board and caused a major malfunction after only 6 weeks of use.

Software Sharing, a cheap way out, BUT………………………..

Regarding the download of information from the World Wide Web instead of the reliable source like AC Delco, keep a few things in mind. You can jump onto some of the sites dedicated to diagnostic tools and download software from, what you think are, trusted sources. The fact is that many people end up downloading malicious software that gives others on the web access to your computer. They steal your financial information, software, passwords and personal information right out from under your nose. Consider the piece of diagnostic software that a friend of mine downloaded (Witech) on a forum a couple weeks ago. The software came from a trusted poster, but what he didn’t know was that the poster got it from a questionable source, posted it on the forum, hundreds of people downloaded it, and within a couple weeks, it was on thousands of computers world wide. A quick virus scan found a TON of spywhere on that download that was NOT there from WiTech. It included data mining software, and malware placed within it by dozens of sources. Long story short, there are BAD people doing BAD things on line! Even good people end up spreading some very damaging viruses and software to good people. You need to practice thorough vetting of all software and software sources before introducing these into your PC.

Regrets! I have a few

So, do you really think that there was not going to be any downside to GM MDI and these software packages? Well…..THINK AGAIN! Here we go with the downside for MDI:

As we stated earlier in this article, the biggest detractor to the MDI package, in my opinion, is GDS software! It is not very user frinedly as GM really needed to get some technicians in on the structure of this program before dumping it on us. I know a lot of GM dealership folks who still struggle with thie program.

To fully appreciate the benefits of GM MDI,you MUST have access to TIS to WEB. That means big bucks for this level of access! A year of middle of the road access will cost you about $1600 bucks if you work with GMs regularly. If you’re a daily flyer, better be prepared to spend a little over fifty bucks a week for weekly access.

As stated earlier, to be able to use the Tech II Emulator (Tech II WIN), you must be able to download software updates onto your PC just like you used to do with your Tech II 32 MB memory card. You will need to update your Tech II WIN program using TIS to WEB, and not only will you need to update it, but you will need to update it every month! Once that month times out, you will need to, once again, download the Tech II software you were using to keep Tech II WIN operational. A weekly or monthly TIS on WEB subscription does NOT give you access to Software Download (SWDL) privileges. This will cost you a minimum of $1600 bucks or a buddy who will give you access to TIS on WEB.

In conclusion, I am very happy with my MDI interface, as I have access to TIS on WEB as well as TIS2000 and have become comfortable with the use of Tech II WIN. I program cars for a living, so the cost benefit is in my favor. If you’re a novice, you may want to think twice about trashing or selling your Tech II. The GREAT news for the novice GM person is that I think Tech II will soon be flooding the market at very reasonable rates, now that it is very quickly becoming antiquated. The bad news to us technicians is that MDI clones are already all over the place on EBay so watch your step! Like so many other clone diagnostic tools, the crap coming out of Korea and some out of China are just that…CRAP!

Good Luck and again, if you find that any of my information is not 100% accurate, or have something to add, or just have a question or two, please feel free to Email me. I don’t get paid for posting these guides folks, I do it so I can teach others and also to learn from those who may know more about this than I do. Please consider sharing your knowledge with others as well. Remember that in the end, it’s them vs. us in this business. Companies like GM who take our hard earned tax dollars, rip off their pensioners and cheat their suppliers who they owed money to by declaring bankruptcy un-necessarily, wont bat an eye when it comes to squeezing us independent repair technicians out of the picture. Consider that here on the internet, we have the ability to join forces and support each other in the effort to thwart greedy companies like General Motors. We can only do it if we band together, spread the word and share our resources. Knowledge is the most valuable resource we have so share it with others. You never know what you may get in return!

How to use GM Tech2 scan tool for Chevrolet C5 diagnostic

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GM Tech2 is a diagnostic tool for the most part. It can be used to program out/in certain RPO’s in the BCM and can be used to bleed the ABS brake system without introducing air into the system. The extent to which it can be used to tune a Chevrolet C5 is that if you have a PCM Image that will work for your car you can save the current PCM Image and flash the new one you have onto the PCM. It cannot go in and individually change the tuning tables in the PCM as can say either EFI Live or HP Tuners tuning tools. But then those tools cannot touch the BCM either.
If you do or plan to do a lot of diagnostic work on your car it can be a worthwhile tool. Most of the diagnostic charts in the factory service manual assume the availability of a Tech 2. But you have to learn to use the tool like any other computerized diagnostic tool. It has layers and layers of menus to wade through. But in certain diagnostic situations it can be an invaluable tool because it allows you to turn on and off hundreds of computerized settings to aid in the diagnosis process.
GM intentionally dumbed down the capabilities of the Tech 2 to change things to avoid law suits due to an errant technician that changed engine or emissions settings that could result in engine damage or emissions violations.

GM Tech2, the bi-directional scan tool can access all the 10 computers in the C5 corvette. That means it can scan for DTC codes, allow the adding or removing of most accessory codes like turning off the mag ride shocks to install regular schocks, fixing window regulator problems, etc. For Bi-directional it can active the ABS system to flush the brake fluid, reset the Long Term Fuel Trims, eliminate the 1-4 shift on manual trans, etc. It cannot make changes (like a tune tool) to the transmission or engine management system. For the avid DIY’er it is a great tool.
In the C5, the “computers” (technically they are modules) and they communicate over the OBDII compatible DLC data bus to each other. The range from you radio to your ride control, to your HVAC system. Even the Bose head unit talks to the PCM and BCM through this bus, but the CD changer talks over a “private” data bus to the head unit.

The Sensor Modules that can be pulled up from the DIC are:
PCM, BCM, TCS, RTD, IPC, HVAC, LDCM, RDCM, SCM, RFA, and SDM.
Only those C5’s with RPO F45 or F55 will have RTD.

Reference: Here is a very useful Tech II Scanner pathing document that you can use to figure out how to get to the end result that you need to test.

GM Tech 2

Authentic GM software puts you in the driver’s seat to fix GM vehicles right the 1st time.

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Tech 2 is loaded with features:
The large, easy-to-read, back-lit screen is the first feature you’ll notice.
* Graphic screen displays both test and graphics, and is capable
* of showing nine sensors at once.Snapshot graphing shows you any failures or glitches at a glance.
* The Tech 2 scanner is reprogrammable to keep pace with  vehicle and
* tool evolution.RS232 communications port provides the avenue to connect future
* devices to your automotive diagnostic equipment Tech 2, such as SPS reprogramming.

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GM Software

Authentic GM software in the GM Tech2
* means you have the same information as GM dealers.Supports on-board diagnostics for all
* GM systems 1992 thru 2008.The authentic GM software will provide
* full bidirectional control when performing powertrain, chassis, and body diagnostics.Store DTC,freeze frame, and failure
* record for later review.Watch the status of vehicle diagnostic
* tests as they run.

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The GM MDI Unit is a compact communication module that manages the transfer of
* data between a vehicle’s onboard ECU network and a PC. The GM MDI Programming Solution Bundle includes a one year subscription to the GM
* Technical Information System (TiS) SPS – a $995 value! With your included TiS SPS subscription you can always access the most current
* General Motors vehicle control module calibrations.The GM MDI Unit has an easy to grip, comfortable, rugged enclosure.
* The GM MDI Programming Solution Bundle allows the user to perform Pass-Thru
* programming procedures using software running on a laptop or desktop PC. Using the GM MDI Unit for programming frees up your Tech 2 for diagnostics.
* User can perform Data transfer and Electronic Control Unit (ECU) reprogramming.
* The GM MDI Unit has shop network communications (LAN and WLAN) capabilities.
* Future expandability, including diagnostic applications.
* GM MDI is also available without TiS SPS subscription.

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CANdi Module
An industry change in protocol from OBD2TOOL to Controller Area Network (CAN) is ongoing. In order to perform diagnostics on a vehicle that uses the CAN  interface, you will need the Tech 2 and a CAN diagnostic interface  module. The CANdi module connects between the Tech 2’s  diagnostic link cable and the OBD adapter. Once the CANdi  module is connected, it can be used on all GM vehicle applications,  even those vehicles using other platforms such as OBD I and OBD II.CANdi Module is included in the Tech 2 Deluxe Kit — No. 3649.

GM Software Subscriptions

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How to Connect the Tech 2 to a Computer Terminal

Follow the steps below and refer to the follow picture, which illustrates the typical Tech 2 Scan Tool connection to a computer terminal.

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1.  Plug the serial port adapter (P/N TA00040) into the serial port marked “A” or “1” on the back of the computer terminal or to the USB port using the USB serial adapter.

2.  Plug the Tech 2’s RS-232 cable into the serial port / USB port adapter and connect the appropriate power supply.

3.  After power is supplied to the Tech 2 and the [PWR] button is pressed, the Car Scanner Tech 2 start-up display
should appear on the Tech 2 screen.

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Power Supplies
Power up the Tech 2 using either:
*  The power jack connector at the bottom of the Tech 2 unit, or
*  The DLC cable power jack connector behind the area where various DLC adapters are connected.

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For non-vehicle communications, connect power source to either location.

For vehicle communications, connect the power source to the DLC cable power jack connector only. Proper grounding may not be present if power source is connected directly to Tech 2.

When the Tech 2 is connected to the DLC of an appropriate vehicle, the vehicle battery supplies power.

When the Tech 2 from www.obd2tool.com is not connected to the vehicle’s DLC, the DLC cable power jack connector accepts power from the following:
*  Cigarette lighter power cable
*  Battery power cable
*  NAO or Universal power supply

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If the DLC and external power source are both connected, the power jack connection supplies current to the Tech 2. In this instance, power from the vehicle’s DLC connector is automatically disconnected from the Tech 2 internal power supply

how to fix Tech2 reports SAAB mass airflow deviation issue P0101

MY GM Tech 2 Diagnostic Scan Tool has reported this issue for a while. My car has been throwing a mass airflow deviation code sporadically while driving. I reset my ecu, drive around for a while but the code will pop up again. When it throws the code the ecu also limits torque (the 04’s way of limp home mode).
I have gone through all of the vacuum lines and was not able to find a single leak anywhere. I think the MAF sensor is bad but I just wanted to get an opinion before I buy a new one.
Here are two pictures showing what the Tech2 Scanner is reading, one is the fuel adaption and trim which should be close to 0% I believe and the car is doing this because of the air deviation. The other is the actual air deviation test; normal fuel correction should be closer to zero, I think it says normal range is between +/- 5% and same goes for the air deviation at idle.

I also took a video of the numbers read from the MAF sensor, which should be sitting between 3.5-4.5 g/s at idle. Mine sits below 3.5 most of the time and jumps up above 5 sometimes.

9th January 2015 update:
Replaced the MAF today, and the readings on the sensor are better (I think that MAF was going bad, I think there are multiple problems) but I’m still getting the p0101 airflow deviation code. I don’t believe that there is a leak on the line or in the intercooler anymore because I ran some tests with the tech 2 and noticed the only time there is an airflow deviation is during idle or letting off the gas. While under high load, deviation sat at right around 0%.
Going to try some more stuff out tommorow. Will report back.

10th January 2015 update:
Today I replaced the Charge Air Solenoid which is located on top of the turbo bypass valve next to the intake filter box. I drove the car around for a while with the tech2 and the air deviation was sitting right around 0%!
I think it is fixed now, I’m going to drive it for a few days to test but so far it seems the MAF and the Charge Air Solenoid were both going bad if not bad already. When I looked up what can happen when that solenoid goes bad, a few spots said it can cause the turbo to “pump” when letting off the gas which in my case caused a sharp fluctuation in MAF calculated and recieved during that time. It also is used to regulate engine idling so I believe thats why I was seeing a large deviation in idle as well.