VW Sharan 2003: Communication Error with Computer, OBD, CDIFA, K Line & ECU Troubleshooting

Question

I warmly welcome,
I recently tried to connect my sharan to a computer using CDIFA and unfortunately I get a communication error. I started to check the cable - the K line and it turns out that everything is fine from the ODB socket to the meter and from the immobilizer plug to the ECU. Is there anything on the meter clocks that can block the connection?

grala1 · Accepted Answer

You only have no communication with the engine controller?
The K line for the engine controller goes through the immo box.
If there is a problem there should be communication with the immo box.
Short-circuit K and W to immo forest and diagnosis should return. They are probably gray-white or white-gray wires.

ociz · Accepted Answer

Check the voltage on the K line.
Under the cockpit, somewhere in the upper left corner there were connectors where all the K line wires come together. Unpin all in turn until you find what is blocking.

sagem173 · Answer

with the meter, you check in the socket whether the 12V is?

zuberek7 · Answer

I checked, it's 12v. I also tried to connect for a short time - I connected pin16 with ecu directly with pin 7 of the OBD socket and then connects but only to the engine itself.

ociz · Answer

Eg additional heat and its rotten beam.

sagem173 · Answer

or ecu freaks out

zuberek7 · Answer

maybe something is happening with the cables because when I bought it, there were no 2 pieces in the fuse socket (there were empty spaces) and when I refilled them, the battery discharged after the night ... Added after 2 [minutes]: I have a total lack of communication. Only when connecting for a short time, as I mentioned before, I connected to the engine controller, I could not cope with others.

zuberek7 · Answer

Thank you very much for the hints. As soon as I find a little more time I will start checking everything you write about and I will keep you updated on the results.

zuberek7 · Answer

I finally found time to review the installation. It turned out that someone was already looking for something and the beam insulation was cut open. 4 yellow-black welded cables protruded from the cut insulation - visible in the photo. In addition, the gray cable with a white K line strip from the OBD socket is also welded to 4 others - also visible in the picture. These welds are factory or are they someone's makeover?

zuberek7 · Answer

These heated wires from the first photo are connected K lines. I unraveled them all and it turned out that the connection was blocked by one of them - most likely from reheating (most likely because I have not checked yet and the computer can not connect now only with reheating).

dabrowski marek · Answer

Buddy, and where is the bundle and if I follow the cable from the obd lines k lines will I find the cable connections k lines

zuberek7 · Answer

it is in a thick hanging behind the fuse box and relay box which is on the left side of the steering wheel. tracking the k line from obd you will reach it.

dabrowski marek · Answer

Thanks a lot or maybe you know what color cable goes to the additional heater and where its controller is located

zuberek7 · Answer

all K lines are gray with a white stripe. only from the immobilizer is white. It is impossible to determine which is what without checking.

zuberek7 · Answer

all K lines are gray with a white stripe. only from the immobilizer is white. It is impossible to determine which is what without checking.

Added after 8 [hours] 34 [minutes]:

Finally, it turned out that the connection blocks the reheating controller. Thank you all for the advice.

[Solved] VW Sharan 2003: Communication Error with Computer, OBD, CDIFA, K Line & ECU Troubleshooting

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