Adaptation of throttle valve control unit — AUDI

AKL
The adaptation process enables the engine control unit to learn the stop positions of the throttle valve control unit with the ignition switched on and the engine not running.

An adaptation must always be performed if the throttle valve control unit (J338) or the engine control unit is removed and refitted or replaced, or if the power supply to the engine control unit is interrupted.

Test conditions

No fault stored in fault memory
=> Page
01-10
, Interrogating fault memory.
Idling speed switch closed, Testing
=>Page
24-74
.
Throttle valve closed (throttle valve angle check by engine control unit), throttle cable correctly adjusted, Testing.

=> Mechanics; Repair Group 20; Removing and installing parts of fuel supply system; Adjusting throttle cable
Mechanics
Removing and installing parts of fuel supply system
Adjusting throttle cable

Engine not running
Power supply to engine control unit more than 8 V, Testing => Page
28-23
.

Connect fault reader V.A.G 1551 (V.A.G 1552) and select the engine electronics control unit with the "Address word" 01. When doing this the ignition must be switched on.
(Connecting fault reader and selecting engine electronics control unit => Page
01-4
.)

Rapid data transfer
HELP
Select function XX
Display readout:

Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

Basic setting
HELP
Enter display group number XXX
Display readout:

Press keys 0, 9 and 8 for "Display Group 98" and confirm entry by pressing Q.

System in basic setting 98
⇒
x.xx V
x.xx V
0000
01
Display readout:

When Q is pressed the throttle valve positioner will move to the minimum stop limit (throttle valve closed) and to the maximum stop limit (throttle valve open).

The control unit records the voltage reading for each position in its non-volatile memory.

This process takes no more than 10 seconds. The throttle valve then remains still without receiving any electrical signals (voltage 0).

System in basic setting 98
⇒
x.xx V
x.xx V
0100
00
Display readout:

The adaptation of the engine control unit to the throttle valve control unit is now complete.

Note:

If one of the following readouts appears on the display, this means that the adaptation has not been completed successfully:

System in basic setting 98
⇒
x.xx V
x.xx V
1100
10
Display readout:

Note:

Relevance of figures in display zone 3:

Display zone 3 · Meaning of readout
1XXX · Fault recorded in memory during diagnosis; interrogate fault memory =>Page . 01-10
X1XX · No current in throttle valve control unit (signal ratio = 0)
XX1X · Adaptation terminated because battery voltage is too low
XXX1 · Idling switch open (position check), Testing=>Page . 24-74

Relevance of figures in display zone 4: see next Page

Relevance of figures in display zone 4:

Display zone 4 · Meaning of readout
1X · Fault recorded in memory during diagnosis; interrogate fault memory =>Page . 01-10
X1 · Adaptation of throttle valve control unit in progress

Basic setting not carried out
Implausible signal
Display readout:

Notes:

See Fault Table, fault code 01087
If the adaptation process for the throttle valve control unit is unsuccessful, the reason can be determined by checking Display Group 1 ("Read measured value block" with ignition switched on)
=>Page
01-79
.
If the adaptation process is unsuccessful, check the test requirements,
=>
24-69
.
After each test requirement has been met try to perform another adaptation of the engine control unit to the throttle valve control unit =>Page
24-69
.

Note:

If the adaptation is interrupted by the control unit, the reason could be one of the following:

The requirements for the adaptation of the engine control unit to the throttle valve control unit have not been met. For a list of the requirements => see Fault Table, fault code 01087.
The throttle valve cannot reach the mechanical idling stop because of a build up of dirt (e.g. oil carbon deposits) or an incorrectly adjusted throttle cable.
Throttle valve control unit or wiring is defective.

After an interruption the fault Basic setting not completed; "Implausible signal" is recorded in fault memory.

The next time the ignition is switched on the engine control unit will try to perform the adaptation again.

End the engine basic setting by pressing the ⇒ key.
Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.