Performing basic setting of throttle valve control part J338 — AUDI

AEB
The basic setting to used to enable the Motronic control unit to learn the stop positions of the throttle valve control part with the ignition switched on and the engine not running.
If throttle valve control part J338 is removed and installed or replaced then a new basic setting must always be performed.

Test requirements:

Battery voltage OK.
Setting of throttle cable OK
All electrical consumers switched off
Setting of cruise control system, if fitted, OK

Interrogate fault memory, eliminate any displayed faults and delete the fault memory.
Switch off engine and switch on ignition.
Select basic setting with the engine not running (function 04) and Display group 98 =>Page
01-109
.

Note:

After confirming Display group 98, the basic setting is started and the throttle valve positioner moves to both mechanical stops. Following this a comparison curve is calculated by means of intermediate steps.

Basic setting
98
⇒
X.XXX V
X.XXX V
Idling
ADP. OK
Readout on display after approx. 6 seconds

The basic setting has been successfully carried out.

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Basic setting
98
⇒
X.XXX V
X.XXX V
Idling
ADP. not OK
If one of the following messages appears on the display, the basic setting has been terminated.

Basic setting
98
⇒
X.XXX V
X.XXX V
Idling
ADP. running
Finish basic setting by pressing the ⇒key.

Basic setting
98
⇒
X.XXX V
X.XXX V
Idling
ERROR

Function is unknown or cannot
be carried out at the moment

Interrogate fault memory
No fault detected
⇒
If no fault is detected, check whether the idling switch opens and closes when the accelerator pedal is activated,Test idling switch =>Page
24-62
.
Idling switch does not open
⇒
Short to ground
If one of these faults is displayed, check whether the idling switch opens and closes when the accelerator pedal is activated,Test idling switch =>Page
24-62
.

Idling switch does not close
⇒
Open circuit.

Supply voltage
⇒
Signal too low
If this fault is displayed, test the voltage supply for the Motronic control unit (voltage at terminal 30 of the Motronic control unit has dropped below 10 V).
Throttle valve positioner sender -G127
⇒
Signal too low or too high
If one of the following faults is displayed, test the sender for throttle valve positioner -G127 and the throttle valve potentiometer =>Page
24-64
.

Throttle valve potentiometer -G69
⇒
Signal too low or too high

Throttle valve positioner sender -G127
⇒
Implausible signal

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