Golf IV ARL springt nicht an nach GRA Nachrüstung | Posts 16+

Pins of the connector (I mean, is the black connection plug "water box" checked to see if it hasn't been pushed back?)

Quote:

I had already unplugged the connector on the GRA, so it should have the same effect as if I were to re-insert the pins, right?

If everything was right, he would run. So, I wouldn't necessarily agree with that.

I can't really do it elegantly, because I don't have the right tool... I made something myself that worked somewhat, the pins are in the right position and seem to be firmly seated in the connector.

In the MWB of the MSTG, the GRA lever functions correctly in all functions, including On, Off, Set, Resume... as well as the green light in the KI.

There's definitely something wrong, but I've had my share of stupid problems with TDIs... but I've never seen anything like this before

I strongly suspect that the MSTG has been damaged...although nothing would have seemed out of the ordinary, such as sparks, a loud bang, or a noticeable smell when working around the circuit breaker or relay box.

My ideas are running out...

The PDE, perhaps? Could it be that, for some reason, there's suddenly no power coming through? Is there a way to check this without immediately removing the valve cover?

Fortunately, I have a second car, with which I can now, albeit reluctantly, start my vacation tomorrow

LG Alex

dr.zikzak wrote:

The voltage at the battery when the ignition is switched on is approximately 12.2 volts, while the 30th terminal on the MSTG has 10.7 volts!

Exactly what I experienced with an AJM once; the contacts of the corresponding fuse were slightly corroded/worn. When I touched the fuse, the voltage in the MWB would fluctuate by approximately 1V. It is likely that a cable or pin is damaged and, due to work on the box, the contact has now been disrupted. Please check, is one of the 30A?

And please, avoid further actions with starter spray or anything similar while you experience this voltage drop. You don't need to worry about PDE or other issues!

Hello Michael!

I won't torture him with Startpilot... I just wanted to see if he would eventually start working!

So, you mean that the STG simply can't function under voltage? Is it definitely the difference in voltage that is at the root of the problem, do you mean?

LG

dr.zikzak wrote:

Is it definitely the voltage difference that's causing the problem?

Right, if there's already 10.7V, what do you think the voltage will be when it starts? Probably something around 9.xV, which is why the control unit shuts down, and that's why the heating element flickers during the start attempt. Check the fault memory of the gateway or KI, it's probably "MSTG no signal - intermittent"

Okay, thanks! Then it seems like this is the right approach! Is there also power supply for the MSTG in the black connector in the water tank? 2 cables come from the car's interior, before the GRA was installed.

Thank you and best regards.

Alex

Hello everyone!

The car is running perfectly again - thank you again to everyone who was involved!!

The beige plug in the water tank has a pin that has partially detached and easily slipped out of the plug, especially when the two parts are put back together. In addition, there was more corrosion on the top of the plug than I initially expected, or almost nothing to see on the "male" part. Therefore, I didn't immediately notice it when I inspected all the plugs.

So, the pin apparently came loose slightly while working on the relay switch or when triggering the black connector, and therefore there was not enough contact or a poor contact surface, which, as has already been gratefully mentioned here, has resulted in the MSTG measuring too little voltage and consequently being shut off.

I have thoroughly cleaned the connectors and treated them with contact cleaner - everything is now securely reconnected and the pins are properly fixed. After that, he tried it on the first attempt, and the cruise control also worked perfectly!

Thank you again to everyone here - it was really great and helpful to find the solution so quickly

LG Alex