ESP AUDI A4 1999 B5 / 1.G APB Engine Electronic Engine Power Control Checking Workshop Manual

24-147
The learning process (adaptation process) is
carried out:

By selecting "Basic Setting" (function 04),
Display Group 060 with the ignition switched
on.
Automatically if the ignition is switched on for at
least 6 seconds without operating the starter or
depressing the accelerator, and if the Engine
Control Module (ECM) registers a "learning
requirement." (In this case, however, there is no
way of knowing whether the adaptation process
was successful or not.) The engine control
module will register a learning requirement if
the previously stored voltage readings from the
angle sensors do not correspond (within a
certain tolerance range) to the new voltage
readings.

Note:
The engine will not start during automatic
adaptation.
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24-150
When the -Q- button is pressed the throttle valve
positioner will be switched mechanically.
In this condition the throttle valve is pulled into an
"emergency running" or default position by a
mechanical spring in the throttle valve control
module. The values supplied by the two angle
sensors for this emergency running position are
stored in the Engine Control Module (ECM).
The throttle valve is then opened by a
predetermined amount. As soon as it reaches
this position the current supply to the throttle
valve positioner is again disconnected. The
spring should then close the throttle valve
mechanically to the previously learned default
position within a specified period of time (spring
test).
The throttle valve positioner then closes the
throttle valve and the values supplied by the
angle sensors in the throttle valve control module
are stored in the Engine Control Module (ECM).
If the ECM disconnects the current supply to the
throttle valve positioner while the vehicle is being
driven, the result will be an increase in idling
speed with fluctuating engine RPM (hunting) and
very slow throttle response.
Pa
ge 15 of 39 Electronic En
gine Power Control
(EPC
), checkin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU04.24.4