AUDI A3 1999 8L / 1.G ATW Engine Electronic Power Control Checking Owner's Guide

If specified values are not obtained: - Also check signal wires.
- Check wire connections from Engine Control Module (ECM) to sensors
for accelerator pedal position.
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Checking wire connections

- Connect VAG1598/31 test box at wiring harness
to Engine Control Module (ECM), do not connect
ECM Page 24
-19
.

If no malfunctions are found in wires:
Repair Manual, Fuel Supply System, Repair Group 20
- Check following wire connection for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
Terminal
VAG1598/31 test box
Socket
1 72
2 73
3 36
4 35
5 33
6 34
- Repair open circuit or short circuit if necessary.
- Replace accelerator pedal position sensor.
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Kick down function, adapting

If the sensor for accelerator pedal position or the
Engine Control Module (ECM) is replaced on a
vehicle with automatic transmission, the kick
down function must be adapted.

Special tools and equipment

or
Requirements
Procedure
VAS5051 with VAG5051/1VAG1551 with VAG1551/3ANo DTCs in DTC memory, check DTC memory Page 01
-16
.
Engine not running, ignition switched on.
- Connect VAS5051 tester or VAG1551 scan tool and select control
module for engine electronics using "address word" 01 Page 01
-10
.
Ignition must remain switched on.
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Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -4- to select "Initiate basic setting" and press -Q-
button to confirm input.
Basic Setting
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -6- and -3- to select "display group number 063" and
press -Q- button to confirm input.
System in basic setting 63
1
2
3
4

When indicated on display
Note:
There will be a prompt: "Operate kickdown".
Note:
During adaptation of the kick down point, the VAG1551 will display "Kick
down ADP in progress". After successful adaptation of the kick down
point, the VAG1551 will display "Kick down ADP OK". - Depress accelerator pedal completely, past kick down point, and hold
down.
- Check specified value in display field 4:
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Display fields

1 2 3 4
Display group 063: Kick down function, adapting
Display xx % xx %
Kick
down ---
Indicated Sensor 1 for
Pedal
position Sensor 2 for
Pedal
position Kick
down Adaptation condition
Functional
range
Kick
down operate
ADP in progress
ADP OK
ERROR
Specified value 12 to 97 % 4 to 49 %
Kick
down ADP OK
Note



If "ERROR." is displayed: Check DTC memory Page
01
-16
.
Note:

The abbreviation "ADP" in display field 4 stands for Adaptation.
"ERROR" can be indicated, for example, if the accelerator pedal is not immediately pressed in response to a request by
the tester or if the accelerator pedal is released while adaptation is running despite the fact that adaptation is not yet
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complete. In both cases, "Basic Setting" must be exited and the adaptation must be performed again Page 24
-139
.
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If specified value "ADP OK" is obtained:

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display (function selection):
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Brake light switch and brake pedal switch,
checking

Special tools and equipment

VAG1526A
VAG1527B
VAG1594A
VAG1598/31
VAS5051 with VAG5051/1
- or
VAG1551 with VAG1551/3A
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Note:
For safety reasons, the instruction from the
accelerator pedal sensor (potentiometer) to the
ECM to open the throttle valve is suppressed
when brake is being operated. This requires the
brake light switch signal and also the brake pedal
switch signal in the control module. If brake pedal
is operated with accelerator pedal constantly
depressed, engine is immediately regulated
down to idle speed. A faulty switch can lead to
undesired regulation.

Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
. Ignition
must remain switched on.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read measurin
g value block
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -6- and -6- to select "display group number 066" and
press -Q- button to confirm input.
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Read Measuring Value Block 66
1
2
3
4

Indicated on display
- Check brake light/brake pedal switch in display field 2.

Display fields

1 2 3 4
Display group 066: Signals to Engine Control Module (ECM)
Display xxx km/h
XXXX xxx km/h XXXX
Indicated ACTUAL speed
Switch positions SPECIFIED speed Switch positions
Functional range
XX00
XX11
Specified value
XX00
(with brake pedal not operated)

XX11
(with brake pedal operated)
Note
Value:X = no significance.
Switch points slightly offset
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