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1Z: Drive with disconnected boost control valve?

 
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dieselmartin
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Post10-09-2003, 8:52    Subject: 1Z: Drive with disconnected boost control valve? Quote

Hi.

I read the article about turbocharger boost pressure.

Here's a follow-up question:

Will driving with the connector unplugged from the control valve clear the error memory?

Is the valve, when not powered, actually set to the standard wastegate pressure, so that the turbo regulates to 0.6 bar?
or
It's relying on outside air -> The turbo is working at full capacity (potentially dangerously).

Thank you.
m;


Translated on 20-09-2026, 13:29.
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Post10-09-2003, 12:03    Subject: 1Z: Drive with disconnected boost control valve? Quote

@dieselmartinViewing profile: dieselmartin:
Quote:
When the valve is not powered, is it actually set to a standard wastegate pressure -> the turbo regulates to 0.6 bar


YES!

Regards,
Alex.
AUDI A3 1.9 TDI, EZ 12/96, ursprüglich MKB AGR, umgebaut zum AHF mit GT1749V-Lader, verkauft mit 250tkm

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Translated on 20-09-2026, 13:31.
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Post10-09-2003, 12:47    Subject: 1Z: Drive with disconnected boost control valve? Quote

And what about the error memory?

Because the MSTG (presumably a system or device) wants to maintain a pressure of 0.9 bar, it controls the valve accordingly, but it detects that only 0.6 bar is being achieved.

So, it will get annoyed icon_wink.gif.

m;


Translated on 20-09-2026, 13:32.
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Post10-09-2003, 12:58    Subject: 1Z: Drive with disconnected boost control valve? Quote

Hello,

"Normally," these solenoid valves are checked by the EDC for short circuits or broken wires.
Quote:
1262
Wastegate control valve - N75: Open circuit/Short circuit to ground.

Possible causes:
Power outage.
Solenoid valve defective.
Short circuit to ground.

Short circuit to positive.

Possible causes:
Short circuit to positive

See the error database. But where is the problem?

A diagnostic system is definitely recommended, and it's especially helpful when you know where the error messages are originating from.

Best regards, Rainer.


Translated on 20-09-2026, 13:33.
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