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Chipping a VW Jetta ECU
Posted by Richard 2 February, 2010
To install a chip on VW Jetta / Golf / Passat ecu, you first must uninstall the ecu from your car. Here is the location of the VW Jetta / Golf / Passat, though the placement might be the same for other models. This document is intended for the 94-95 VR6, but again, the same may apply to other models, so it can be used as a guide.
The ecu is located on the engine compartment, below the passengers side wiper assembly, as shown in the picture below.
Remove the hood seal and plastic cover over that area and then release the 68-Pin harness connector by pulling the plug end lever, away from the wire harness. This will release the plug so it can be removed from the computer. Now, remove the bolt that secures the computer to the car’s body and slide the computer out. Often, it can be slightly tight, but it will come out.
Once the computer is out, remove the (4) #10 Torx screws that secure the computer cover and gently slide out the heat sink and connector with the circuit board. Take precautions against static electricity by sitting down and grounding yourself by touching the heat sink portion of the computer. This will balance any existing electrical differential of potential.
Some 1994-1996 VR6 computers may have the ROM soldered to the circuit board and will have to be un-soldered and have a socket installed (included). If this is your case, you can either unsolder the chip yourself if you have skills on electronics soldering or take your car computer to any TV or electronics technician to unsolder it and solder the socket in.
Click on image to enlarge
If your ROM is in a socket already, then gently pry the ROM from the socket with a small flat screwdriver. Lift each side little by little until fully extracted and take note of the notch on one end of the ROM and the socket.
When inserting the new ROM, make sure that the notch is pointing to the same direction as the ROM you just pulled out. Make sure that all the pins are aligned in the socket before carefully, but firmly pushing it all the way down.
Now put the ecu back together and reinstall it on its place. Plug back the 68-Pin connector and push it until engaged. Put back the plastic cover and hood seal.
Great real chips for this ecu can be found at
They are very affordable, but don’t let the price fool you. Even though they are low priced, they offer great drivability and power gains fro your VW.
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Categories : Automotive
I think I will try to recommend this post to my friends and family, cuz it’s really helpful.
what about a 95 jetta sohc 2.0?
Hello Rooster.
Most installations are similar. What changes is the location in the circuit of the EPROM chip to be replaced.
In some 2.0L computers, the chip is located on a flip board that is installed upside down, against the main circuit.
If it is a Bosch computer, it can be recognized by using a gray label, with the software number, which usually starts with “1267xxxxxx”.
Some are socketed, but many are soldered in the circuit, so desoldering will be needed in most cases.
Cheers,
Richard
My cousin recommended this blog and she was totally right keep up the fantastic work!
Richard,
I have followed your guide above of this link which is very helpful, but I am now stuck on how to disconnect/unplug the harness wires from the ECU receiver. does the harness wire connector slide off to the side or does it pop off? please let me know asap as I am about to receive my performance chip for my 98 jetta VR6. thanks a bunch
Richard, the connector should have a latch that locks the ecm harness. Just unlatch to disconnect and pull out carefully.
Best Regards,
Richard