Audi V8 Manuel de service télécharger pdf (Page 47)

SSP217_059

5 V/Div. 0,5 s/Div.

Recorder mode

Crash signal

with triggering

Triggering range

Crash signal

SSP217_058

5 V/Div. 0,1 s/Div.

In the event of a crash where the belt

tensioners/airbags are triggered, the engine

control unit deactivates actuation of the fuel

pump relay. This prevents excessive quantities

of fuel escaping if the fuel system is damaged.

The crash signal is a square-wave signal with a

speciﬁc signal ratio (high level to low level).

The signal is transmitted continuously by the

airbag control unit.

In the event of a crash, the signal ratio is

inverted for a deﬁned period of time. During

this period, the signal ratio is inverted relative

to the standard signal so that the supply of

fuel is shut off until the engine is restarted.

In addition, the “crash shut-off“ fault is

stored.

The fault entry can only be deleted

using the diagnostic tester.

Automatic mode

Standard signal

Crash triggering

Signal traces for crash signal using oscilloscope

function of VAS 5051

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Audi V8 Manuel de service Page 47