01237 - Kraftstoffabschaltventil - sporadischer Fehler | Posts 16+

I'm asking because you're describing something as the cause of your issue that is actually physically impossible.
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Physically speaking, there is the law of energy conservation: The electrical energy (battery) provided was converted into thermal energy (burnt-out wires).

What you mean is, there is no direct electrical connection between the VP37 housing and the 3-pin connector to the control unit.

ok, aber das einzige, was er laut Aussage getan hat, war das Entfernen der 6-eckigen Mutter der Lichtmaschine und gleichzeitig das Ziehen am Kabel, das dann aus seiner Hand gerutscht ist und in Richtung VP 37 gerutscht ist...

I will now focus on the relays and perform a 1:1 check...

Why did the ABS block safety fuse fall out?

The thick cable from the alternator directly provides 12V from the battery. According to my knowledge, there is no fuse between the battery and the alternator in this vehicle. In the event of a short circuit to ground/chassis, currents of several hundred Amperes could occur. This is more than what you'd find in a typical welding machine.

The ESP is made of metal and is screwed onto the engine block, which is connected to the chassis with a thick ground wire. Actually, this should be a short circuit, where the current flows through the metal of the ESP, not through it.
Since the ESP control clearly isn't working anymore, a large current must have flowed, resulting in a significant voltage drop across the ground cables, which could have caused further damage.

Regarding current strength, virtually anything can be faulty. In this case, the most likely culprits are probably the ground wires and control units. It's quite conceivable that entire ground wires or ground wire bundles within control units have completely vaporized. This can only be checked piece by piece on-site.

As can already be seen, current is flowing through the blue and gray lines towards the control unit. However, the current does not end there. It must have flowed through the STG and then exited the STG via another line. Since the current has already been sufficient to melt the line, it has certainly also damaged something within the STG. The ground connection of the STG should also be checked. Since the control units are interconnected, more could potentially fail.

The shut-off valve also appears to be completely welded shut. It should also be checked whether the flow meter and the pump of the ESP are still functioning.

That the ABS system has failed, sounds like the power supply there may also have been damaged.

In short: Introducing currents as high as those from a welding machine into electronics can easily cause total damage.

Good luck!

Greetings
Guste