Golf 4 Notlauf (Solution) | Posts 16+

Interruption/Short circuit to ground = Disconnect plug or cable break

Also, the pins in the connector are also a bit bent. Then, in addition to the damage caused by squirrels, the same effect occurs.


'Sporadisch' would be deleted and see what comes back

Measure the individual connections to the MSG separately and against each other.
Maybe even better - conduct a connection test with the relevant parts:
- Fuel pump relay (J17),
- Exhaust gas recirculation (EGR) valve (N18),
- "Motor for Intake Valve (V157)"
- Solenoid valve for charging pressure regulation,
- Valve for coolant exhaust gas recirculation (N345).
What happens then?
That the "Saugrohrklappe Motor" error appears, surprises me. I also thought the valve was controlled by a vent.
hg
Herbert

Herbert wrote:

That the "Saugrohrklappe Motor" error appears, surprises me. I also thought the valve was controlled by a vent.

No ... The AXR has a PWM for the DK ...
It's just an EU4 engine

Ok, AXR/ATD are the exceptions for G4... annoying when you don't read properly.

I will be receiving an ECU for testing in the next few days, but it will not have an immobilizer.
Before that, I will re-examine all the lines as Herbert described them.
"I have already checked all the connections against ground, as well as against positive, {VERIFYING THE CONNECTION}"
I will also try the "Stellglieddignose" method. If the golf is also involved.

However, I can deliver the results no earlier than Saturday, as the golf cart needs to be "back on the road" first.

Also, I also had a conversation with someone today who repairs tax devices. He meant that there were some model series that had some substandard components and were now prone to failure.
This device with the suffix KP belongs to this category.
I will also seek a second opinion from another company for confirmation.
Let's see.
I will get back to you on Saturday.

Greetings
Bolzer

Quote:

Furthermore, the message "Short circuit to ground" actually points more towards a lack of supply voltage than a lack of ground.

If one of the supplied components sporadically produces a near short circuit to ground, the supply voltage on all components connected to the cable will drop...

I would first disconnect all the affected components one by one, start the engine, and monitor the fault memory.

For example, the suction tube valve would be a candidate for a short circuit, as it is directly connected to ground.

Practice makes perfect.

Quote:

17932 - Fuel pump relay (J17) P1524 - 35-10 - Intermittent/Short to Ground - Sporadic 17849 - Exhaust Gas Recirculation Valve (N18) P1441 - 35-10 - Intermittent/Short to Ground - Sporadic 19557 - Engine for Intake Valve (V157) P3101 - 35-10 - Intermittent/Short to Ground - Sporadic 17957 - Solenoid Valve for Lift Pump Pressure Regulation (N75) P1549 - 35-10 - Intermittent/Short to Ground - Sporadic 17903 - Shutter Valve for Radiator Exhaust Gas Return (N345) P1495 - 35-10 - Intermittent/Short to Ground - Sporadic These cannot be deleted anymore. The car drives normally for a short time, then enters a failsafe mode.

Sporadic errors should at least be able to be deleted within a certain timeframe, right?
What happens if only the ignition is faulty and the error is deleted?
hg
Herbert

Hello and Good Morning,

Without actually knowing much about it:

Have you checked your battery?

My and other Touaregs and Phaetons also experience a lot of errors when the power supply is poor, and they start doing really strange things that are difficult to diagnose!

This seemingly minor issue has led to exorbitant bills and multi-week workshop stays for some people because, strangely, the vehicle still started without any problems (even the V10 TDI at -15°C)...

Maybe it will help you further...

SG
Alevuz

Unfortunately, the errors cannot be deleted, or the errors reappear immediately. Even though it's occasionally listed in the error memory.
The vehicle is stuck in emergency mode and will not exit it. Disconnecting the control unit also doesn't help.

As I said. I'm testing the other control unit.
If the errors disappear, I measure all the lines again against ground, plus, and also against each other.

Then we'll see what it was.

To the battery.

Then, errors would appear in multiple control units. Not just in a specific circuit. And the errors could also be deleted.

But checking also doesn't hurt.

Greetings
Bolzer

Quote:

If the errors are then gone

And if they suddenly appear there too, and also in a different car, and you can't get rid of them anymore, even from the control unit?

Do you then ...

Quote:

I then measure all the wires again against ground, positive, and against each other.

Hello Rainer

You are right. It's a dangerous game.

But I'm taking that risk this time.
Since I have already checked all the wires and haven't found any short circuits, and I have spoken to 2 companies that repair control units, who have independently confirmed that these control units frequently experience component failure, I now have a 50% chance.

It is clear. I currently do not have a completely 100% certain diagnosis.
I currently lack the ability to measure the connections for short-circuit detection.
I have already checked individually for short circuits to positive and negative terminals multiple times.

At the moment, I am very sure that it is a control unit. I will probably know it by tomorrow, at the latest by Saturday.

Nevertheless. Thanks again for the tip.
I will definitely re-check the lines before installing the engine.

Greetings
Bolzer

Please perform at least the following tests and the inspections recommended by the auto service beforehand. The previous tests against both "Masse" and "Plus" have proven to be inconclusive.
The error monitoring circuits for each input are initially independent and independent of the operating function. It is unlikely that everything will break down at once.
In this specific error case, the MSG notices that the inputs do not rise to approximately +12V when the actuator is switched off. There might be a "soft short circuit" somewhere, so that there is still enough voltage available for operation, but a fault is already being detected.
Question to the experts - if the fuel pump relay is not activated, will the engine still start or run?
hg
Herbert

Yep, the car starts normally at first, but then it shuts off again.

The fuses of the supply lines for the listed sensors blow out due to a (minor) short circuit. I experienced this even in my car, even when it was around 70°F outside – the fuse from the vacuum box simply blew. After that, you also get such a great list of errors. (NW sensor is connected to it)
Then you won't measure the voltage anymore.

I would also be willing to take the risk of using a different tax device. The tax devices are available at the "nearby dealer" for 50€. You have already replaced some parts and checked the wiring.


And the electrical transfer of data is also not a topic - you seem to know someone who can do that. If not, I know a

Greetings

How about we start by reading?
hg
Herbert

Quote:

How about we start by reading?

It's better to tackle the problem from the back, rather than trying to fix it head-on.

If the cable harness is "really" in order, there are essentially only 2 possibilities.

One of the control elements has a short circuit or a STG malfunction.

For him, it apparently seems like disconnecting and testing the connectors is not enough effort.

Hello Herbert
Hello Auto Service

I hope you're not talking about me.

Herbert wrote:

How about we start by reading? hg Herbert

Autoservice wrote:

How about reading first? Quote: It's better to tackle the problem from the back, rather than trying to fix it head-on. If the cable harness is "really" in order, there are essentially only 2 possibilities. One of the control elements has a short circuit or a STG malfunction. "Apparently, disconnecting and testing the connection components is not enough effort for him."

That would be a shame.
Because I am following your advice, and I will even go to great lengths to contradict you. At least, you're helping me.

It's possible that I may have expressed myself in a slightly strange way. (I'm not a particularly good writer.)
The car is not mine. Therefore, I also wrote that I can deliver the results no earlier than this evening or on Saturday.

I received the replacement device today. I might get the car tonight, or possibly on Saturday instead.

Then I will check everything as you suggested before I connect the control unit. Promised

Best regards, Bolzer