1996 AUDI A4 engine

24-154
Note:
The engine control module converts the voltage readings from the angle sensors into percentages of 5 V and displays them as percentages. (A signal wire voltage of 5 V is equivalent to 100%.) Read Measuring Value Block 62
1
2
3
4

Indicated on display
- Check specified display values for electronic throttle potentiometer
voltages.

Display fields

1 2 3 4
Display Group 062: Electronic throttle potentiometer voltages
Display
xx %
xx % xx % xx %
Indicates
Throttle valve angle
(angle sensor 1) Throttle valve angle
(angle sensor 2) Accelerator position
sensor 1 Accelerator position
sensor 2
Work Range
min.: 0 %
max.: 100 % min.: 0 %
max.: 100 % min.: 0 %
max.: 100 % min.: 0 %
max.: 100 %
Specified value
3 - 93 %
(Idle value: 8 - 18%) 97 - 3 %
(Idle value: 80 - 90%) 12 - 97 % 4 - 49 % - Observe display fields 1 and 2.
- Slowly depress accelerator pedal to full throttle position.
Pa
ge 21 of 39 Electronic En
gine Power Control
(EPC
), checkin
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pair&id=AUDI.B5.FU04.24.4

24-157

Checking voltage supply to throttle valve
control module

- Disconnect harness connector from throttle
valve control module.

- Switch ignition on.

If the specifications are not obtained, test wiring connections from engine
control module to throttle valve control module Page 24
-158
.
If the readouts match the specifications, test also the signal wires and
activation wires for the throttle valve positioner Page 24
-158
. - Connect hand-held multimeter (voltage range) between the following
sockets on connector:
6-pin connector on wiring harness, socket
Specification
2 + Ground (GND) approx. 5 V
2 + 6 approx. 5 V
Pa
ge 24 of 39 Electronic En
gine Power Control
(EPC
), checkin
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yp
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pair&id=AUDI.B5.FU04.24.4

24-158

Checking wiring for voltage, signal and
activation

- Connect VAG1598/31 test box to wiring harness
for engine control module. Do not connect to the
engine control module itself Page 24
-20
.

Test the following wiring connections for open circuits and short to B+ or
Ground (GND).
Electrical Wiring Diagrams, Troubleshooting & Component Locations
If no wiring malfunction is detected:
6-pin connector on wiring harness,
socket
VAG1598/31 test box,
socket
1 92
2 83
3 117
4 84
5 118
6 91
Resistance in wiring: max. 1.5 ohm
- Repair any open/short circuit as necessary.- Replace throttle valve control module.
Pa
ge 25 of 39 Electronic En
gine Power Control
(EPC
), checkin
g
11/22/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.4

24-159

Throttle Position (TP) sensor -G79 and
Sender -2- for accelerator pedal position
-G185, checking


Component location of Throttle Position (TP) sensor -G79 and
Sender -2- accelerator pedal position
The Throttle Position (TP) Sensor -G79 and Sender -2- for accelerator
pedal position -G185 are located at the accelerator pedal. Both sensors
inform (completely independently of the other) the engine control module
of the driver's throttle requirement (pedal position). Both sensors are
located in a single housing.
- Connect vehicle diagnostic, testing and information system VAS 5051
or VAG1551 scan tool and select engine electronics control module by
entering address word "01" Page 01
-9 . When doing this the ignition
must be switched on.
Pa
ge 26 of 39 Electronic En
gine Power Control
(EPC
), checkin
g
11/22/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.4

24-161


Display fields

1 2 3 4
Display Group 062: Electronic throttle potentiometer voltages
Display xx % xx %
xx %
xx %
Indicates Throttle valve angle
(angle sensor 1) Throttle valve angle
(angle sensor 2) Accelerator position
sensor 1 Accelerator position
sensor 2
Work Range min.: 0 %
max.: 100 % min.: 0 %
max.: 100 % min.: 0 %
max.: 100 % min.: 0 %
max.: 100 %
Specified value 3 - 93 % 97 - 3 %
12 - 97 %
(Idle value: 12 - 18%) 4 - 49 %
(Idle value: 4 - 13%)
Note:
The engine control module converts the voltage
readings from the angle sensors into
percentages of 5 V and displays them as
percentages. (A signal wire voltage of 5 V is
equivalent to 100%.)

- Observe display fields 3 and 4.

- Slowly depress accelerator pedal to full throttle
position.
Pa
ge 28 of 39 Electronic En
gine Power Control
(EPC
), checkin
g
11/22/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.4

24-164
If the specifications are obtained:

- Check signal wiring Page 24
-164
.
If the specifications are not obtained:

- Check wiring between Engine Control Module
(ECM) and accelerator position sensors.

Checking wiring

- Connect VAG1598/31 test box to wiring harness
for engine control module. Do not connect to the
engine control module itself Page 24
-20
.

- Check for open circuit and short to B+ or Ground
(GND) in the following wiring connections:

Connector socket
VAG1598/31 test box
Socket
1 72
2 73
3 36
4 35
5 33
Pa
ge 32 of 39 Electronic En
gine Power Control
(EPC
), checkin
g
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.4

24-166

Kick-Down function, adaptation

On vehicles with automatic/inifinitely variable
transmission, when the accelerator position
sensor or the Engine Control Module (ECM) was
replaced, the Kick-Down function from ECM must
be adapted.

Test conditions

No malfunctions stored in DTC memory
Page 01
-15
, check DTC memory

Engine not running, ignition switched on

- Connect vehicle diagnostic, testing and
information system VAS 5051 or VAG1551 scan
tool and select engine electronics control
module by entering address word "01" Page 01
-9 .

When doing this the ignition must be switched
on.
Pa
ge 35 of 39 Electronic En
gine Power Control
(EPC
), checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.4