In the field of automotive repair and repair of plants and immobilizer (e)s, it is common to face problems related to immobilizers and coded keys, and many even without solution or very expensive, as they require the exchange of entire kits, plants, control units, keys, and even speedometers and or panels. What is often not an option, for many older vehicles already, for example, it is no longer possible to find such new parts, and sometimes not even used in good condition.
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For most electronic injection systems there are ways to disable the encoded key, and from there it is possible to start the vehicle engine without the need for a coded/programmed key. In many cases the only way to “get the vehicle to run” again is by eliminating the coded key system.
To disable the immobilizer, there are the following ways:
- Using emulator chip;
- With the programming of the electronic injection plant;
- With modification of the hardware of the electronic injection plant.
The emulator chips, are nothing more than, small printed circuit boards that contains a circuit that ” pretends ” to be the encoded key and thus allow the start without the need for a coded key. They simulate the system, the disadvantage is that they are not very common in Brazil, and when they meet are expensive and very specific (only work for certain car models).
The programming of the Electronic Injection Center is the most common and most widely used method, not only in Brazil but also worldwide, and is the most effective solution for problems with vehicles that no longer work with a coded key.
The hardware modification to unlock the electronic injection plant was widely used in old cars from the 1990s to the year 2000, after which it was no longer possible to use hardware modification devices to disable the coded key in cars around here. Things have changed…
In many cars, the immobilizer data is recorded on a small soic8 encapsulation chip, and just carefully remove the chip from the central board, place it in an eeprom programmer, and write a correction file over the original file. (Never forget before anything backed up the original file in case something went wrong).)
In other cases, programming should be done directly in flash memory or in the internal memory of the central processor. To program the processor there are specific programmers who are imported from abroad and sold in Brazil.
What is Reset and Decode?
In the automotive industry, the terms Reset and Decode have the following meanings:
- Reset: It is the act of preparing a Central used to be adapted in another vehicle. For example, if you need to buy a central for your car because its burned and you only find used in some junkyard, you must reset it for it to work in your car. In a nutshell the plant is “married” to its home car. For it to work in a different car it must go through this reset procedure.
- Decode: It is the act of disabling the immobilizer and/or encoded keys using programming.
- For both the procedure is similar and I will explain better below.
How to reset or decode a module?
It is impossible to teach here how to reset or decode all modules / centers that exist, because for each module is a different procedure.
However, in today’s article I will teach how to do in a few hundred models of automotive plants!
Note: I want to remind you that this article is intended for technicians or auto enthusiasts. If you are just a curious and have no notion of electronics or electronic welding do not do this. You can disable the center of your car.
To reset/decode a central you will need the following tools:
- Air welding station;
- Weld Flow / Weld paste / Dewelding Mesh;
- Tweezers;
- An EEPROM TL-866 40-pin socket programmer;
- In some cases it is necessary to have a K-line programmer such as ST10 or Ktag;
- An adapter for eeprom soic8 programmer for dip8;
- A computer running Windows XP or higher;
- The software and files made available here in the article.
See this article on how to assemble your own ST10 programmer to reset central, and download;
I will cite three practical examples of how to remove the immobilizer, in three different models of cars, of different brands!
The first is Fiat Uno/Palio/Strada with Marelli IAW 4AFB system:
The first step is to disassemble the injection module carefully, because it is usually glued with a type of industrial “gum”, a glue that serves not to allow water or dust to penetrate inside the centralin, it is necessary to pull the plate carefully and with the help of a plastic spatula or something that does not damage the electronic components inside the module.
I recommend that you take a picture of the component that will be removed from the board to remember the position in which it was before removing it. The soic has position to be welded, and the reference is pin 1 which is marked by a ball on the face of the component.
The second step will be to prepare the circuit for desolating the soic component 8 where information about the vehicle and the immobilizer is stored. it is necessary to isolate with adhesive tape the other parts and components of the plate to prevent weld ing splashes from falling on components that will not be handled.
After preparing the soic desoldering board, it is necessary to moisten the legs of the soic a little, with a little flow and paste for welding with the aid of an anti-static brush, after that, just heat the soldering iron to a temperature of approximately 230 Degrees °C then fill the legs of the integrated circuit with melted weld , heating both sides equally. After the weld is shining just remove the soic 8 with the help of a common clamp or with a vacuum clamp.
The third step is, clean the excess welding that is on the legs of the soic with the dewelding mesh, heating the soic terminals and putting the desolder mesh in contact with them so that the mesh “pulls” the weld, and so leave the terminals clean to place the integrated circuit in the EEPROM programmer, taking care to put the component in the right position , respecting pin number 1, which is identified by a small “ball” on the face of the component.
If until then everything worked out, now just put the soic on the tweezers or adapter of the eeprom programmer, connect it to the computer, open its interface and select in the list of components the brand ST, then the model SOIC8 model / series 95160, as written on the face of the component.
Then read and back up the original soic 8 file, using the “R” Read options from the programmer interface, then click File and then Save and select a folder to save the backup of the original file. Rename the file in a way that can distinguish it from the others you will generate, for example: Original IAW 4AFB file. Bin
The next step is to repair the file to be written back in soic, just open the AETOOL in the select option Brand choose “FIAT”, in the option Select ECU Type choose MAGNET MARELLI IAW 4AF. XX, click the Open button and select the file you extracted from the soic, then click REPAIR, and lastly click SAVE to save the file already repaired/unlocked.
You can use the binarios and hexadecimal file comparator program to prove that the file has been successfully repaired.
To make it easier, save it as iaw 4AFB name FIXED. Bin. To insert it into the soic open the programmer interface and click FILE and then OPEN, choose the repaired file and give ok to option that appears in the window. After uploading the file, check if the correct component is selected which is ST 95160 SOIC8, if everything is okay then just click “P” to program!
Wait for the end of the programming, if all goes well the sucessful message will appear in the programmer’s log, can close the window, remove the soic from the programmer and prepare to weld it on the board again.
To weld it back on the plate, you need to first clean the tracks of the plate carefully with the soldering iron, a little flow and paste to weld with the help of the dewelder mesh, just heat the mesh and pass it lightly under the tracks to remove the excess tin that is left. Finally, pass a little isopropyl alcohol to remove dirt debris, place the soic under the plate aligned correctly in the same position as it was previously and give a drop of weld in terminal 1 and a drop of weld in terminal 4 taking care to align everything thoroughly.
Weld the rest of the component terminals, check with the aid of a magnifying glass that there is no short circuit between the component terminals, do a final cleaning with isopropyl alcohol and then you can close the plant to test it!
Be sure to remove the immobilizer box from the car before connecting the plant already unlocked in the car again, because the immobilizer’s box can program the plant again, and your work will be lost. The canister is located below the steering column in Fiat Uno, Palio, Strada, Brava, Marea, Fiorino and other Fiats manufactured until 2014.
The second is VW Gol G4, G5, Cross Fox, Space Fox, Voyage, Saveiro Cross with Bosch ME 7.5.X X system = anything.
To remove the immobilizer from vw systems with Bosch ME 7.5.x the procedure is the same for FIAT with Magnet Marelli, the only difference is that you need to select correct model brand of the soic8 component in the programmer interface, and then open the AETOOL and select in BRAND the volkswagen brand and Type ECU select the system BOSCH ME 7.XX . In BOSCH systems normally the component to be programmed is ST 24040 or 95040.
The rest of the procedure is the same as the previous one.
Note: The soic is on the back side of the plate, right in the middle.
Reset/Decode of the old IAW 1G7 modules of fiat palio, Chevrolet DELCO of the old Corsa, S-10, Omega and some old CITROEN:
This procedure is a little different, and applies to plants that have motorola processor 68HC11 or Texas TMS370 and TMS374, and used memory ROM ST27C512 DIP28.
For these systems, it was enough to write a file available in AETOOL (to find just select the correct assembler and central model in the list). and then write it to a virgin memory ST27C512, the file forces the processor to reset the immobilizer to the unlocked state, and allows the vehicle to start running without the need for coded key.
Basically you just need to record the virgin memory with the file and the memory will become a tool that can be used to unlock other central, it will become a “chip tool”.
- Remove the car center
- Mark the position of the chip or take a picture so as not to connect wrong!
- Remove the original chip from the socket
- Put the new chip tool you recorded
- In the vehicle remove the box from the code, and then place the center in place again
- Only turn on the ignition for about 2 to 3 minutes
- Turn off the ignition and remove the control unit from the vehicle again
- Put the original chip back in the
- And ready the plant will be unlocked and ready to operate without immobilizer.
This procedure is reversible, and to encode keys in the car again just put a box kit + key working and it will program and get married to the system automatically.
Attention visitor all files made available here for download are password protected, to unpack just use passwords: umgenio.com.br or vendasml
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