GRA Schalter und Geschwindigkeitssignal | Posts 16+

Hello Sebastian,

I was the one who had problems with the automatic speed control system (previously).
Besides your speed signal:
You can achieve the 000011 setting by setting pin 66 of the ECU to 58 (I believe these were the correct values). However, this did not have a positive effect on the cruise control in my case either. I now have a different Passat, as my old one was unintentionally damaged. In the "new" one, the non-functional GRA lever from the old one works perfectly.
I've tried everything and still haven't figured it out

Greetings, Albrecht

Hello again...

Okay, I've done a bit more searching. I've already replaced the speed sensor on the gearbox (due to 'unplausible speed signal'), but that didn't help. (Someone told me that a weak signal might power the instrument cluster, but not necessarily the ECU.) I'm now pretty sure that the signal first goes to the speedometer and then to the wiring distribution behind the steering column, from where it goes to the ECU, radio, etc. That would be the next point where I could potentially troubleshoot if I had an oscilloscope. Or can the rectangular signal be measured in some other way?

What happens if the 'Geschw.sign.' error is stored in the memory? Does the GRA then function correctly? Or will it be switched off for safety reasons?

My brake pedal switches appear to be closing simultaneously (according to VAG-COM).

I have also disabled and relativized...

Are there any new ideas? I currently don't want to connect pins 58 and 66, because I believe it has nothing to do with the issue.

VAG Number: 028 906 021 BF
Soft Coding: 00002
Component: 1.9l R4 EDC G00SG 0804
Shop #: WSC 01268
Label File: 028-906-021.LBL

This is what the VAG-COM shows for the control unit.

Hello konfi,

What happens to the error if you delete it? Does it reappear immediately, or only after some time? When he is inside, the cruise control does not work.

Regarding pins 58 and 66, you can believe it. The tip came from Dieter T3, if I remember correctly. I'd definitely give it a try.

Best regards, Albrecht

The signal from the instrument cluster has nothing to do with the GRA and is completely independent of it.

Objection, Bertil!

I just took a look at the wiring diagrams. For the Golf 3, 1997 model year, the only signal from the speed sensor that goes to the instrument cluster (pin T28/27) is the one that goes from the KI (instrument cluster) to pin T28/7 to the central electrical system (fuse box) pin U2/2. From the control panel, go to pin W/1 and then to the junction box for the speed signal TV13, and from there directly to the motor control unit.

The engine control unit is therefore the final component in the chain.

Have fun tracking the signal,
-Private

Edit: For completeness: The pin on the MSG is labeled T68/43. Forgot...

Or can I measure the rectangular signal in some other way?


Should actually work with a diode test lamp.
Maybe you know someone at a truck repair shop. There is a tester (for checking the tachograph) with which you can measure the signal.


We also had a similar problem once.
Cause was a faulty AI.
The speedometer signal was received, but it no longer functioned (probably because a foreign radio had been installed, which had 'destroyed' the KI).
Then we simply (according to a VW electrician's tip) 'bypassed' the KI. That is, we connected the signal from the speedometer directly to the line going to the engine control unit. I know it's not exactly professional, but it has been working like this for several years.

Thank you very much for the new tips. I will try them out as soon as I have some space to work on.

Hi,

1. If your speed signal is not functioning correctly, the GRA will naturally not work. The MSTG will already switch off if there are jumps of more than +-1 km/h.
2. Would you, in my place, first disconnect the wire from the radio? Who knows what the radio might do with it.
3. You can check with a multimeter: Remove the sender from the transmission, connect the multimeter to the MSTG, and then slowly turn the sender (ignition on, cable connected, logo), then the voltage should change between 0 and 12V.
and 4. the one with pins 58 and 66 only applies to newer MSTGs, but these are not typically installed in groups of 3.

Good luck,
Dieter

As I wrote above, I have just installed a new gear on the transmission. Therefore, it should not be a problem there. I had also suspected that... unfortunately, no. I will first try the tips mentioned above and then get back to you. Thank you anyway.

So, the problem isn't the error message. I can't find any wiring diagrams on volkswagen.msk.ru. Could someone please help me? Engine 1Z 90PS TDI, first registration 028 906 021 BF, ECU. And of course, the GOLF III (Bon Jovi Edition)

Okay, I finally found the problem. The ground signal on the radio was connected to the positive wire (VW workshop!!), and now that the fault memory has been cleared, the GRA has been activated, and the cable has been disconnected, everything is working perfectly. Thank you for your help.