sensor AUDI A4 1998 B5 / 1.G ATQ Engine Electronic Engine Power Control Checking User Guide

24-151

Notes:

The reason why the value indicated in display
field 1 climbs, while the value indicated in
display field 2 decreases, has to do with the fact
that the potentiometers (angle sensors) in the
throttle valve control unit run in opposite
directions.
This means that the voltage tap of angle sensor
1 runs from 0 to 5 volts. (The more the throttle
valve is opened, the larger the voltage; percent
indication climbs).
The voltage tap of angle sensor 2 runs from 5
to 0 volts. (The more the throttle valve is
opened, the lower the voltage; the percentage
decreases).
If indications do not resemble description:

- Check voltage supply and wire connections of
throttle valve control module Page 24
-152
.
Pay particular attention to harness connectors
that could be loose or corroded.

- Check accelerator pedal position sensor Page
24
-154
.
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Throttle Position (TP) sensor, checking

Special Tools and Equipment

VAG1526A
VAG1594A
VAG1598/31
VAS5051 with VAG5051/1
- or
VAG1551 with VAG1551/3B
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24-155
Both the Throttle Position (TP) sensor -G79- and
the Sender -2- for accelerator pedal position -
G185- are located at the accelerator pedal and
communicate the driver's intentions to the ECM
completely independently of each other. Both
sensors are stored in one housing.

Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select the control module for engine
electronics using "address word" 01 Page 01
-
9 .

Ignition must remain switched on for this.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
Input display group number XXX

When indicated on display:
- Press buttons -0-, -6- and -2- to select "display group number 062" and
press -Q- button to confirm input.
Read Measuring Value Block 62
1
2
3
4

Indicated on display:
- Check specified values for E-gas potentiometer voltages in display
fields 3 and 4.
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24-156


Display fields

1 2 3 4
Display group 062: E-Gas potentiometer voltages
Display xx % xx %
xx %
xx %
Indicated Throttle valve angle
(angle sensor 1) Throttle valve angle
(angle sensor 2) Sensor for
Pedal position Sensor 2 for
Pedal position
Functional range 0 to 100 % 0 to 100 %
0 to 100 %
0 to 50 %
Specified value 3 to 93 % 97 to 3 %
12 to 97 %
(Idle value: 8 to 18 %) 4 to 49 %
(Idle value: 3 to 13 %)
Note:
Engine Control Module (ECM) calculates the
voltage values of the angle sensors in percent
relative to 5 volts and displays these percentage
values. (5 volts supply voltage represents 100
%).

- Observe display field 3 and 4.

- Slowly depress accelerator pedal completely.
Percent indication in display field 3 must rise
uniformly. The tolerance range 12 to 97% is not
used completely during this.
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24-157

Note:
The indicated value in display field 3 must always
be about twice as large as the value in display
field 4.
If indications do not resemble description:

- Check voltage supply and wire connections of
sensor for accelerator pedal position Page
24
-158
.
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24-158

Checking voltage supply of Throttle Position
(TP) sensor

- Remove driver-side storage compartment.

Repair Manual, Body
-Interior, Repair Group
68; Instrument Panel; Removing Driver
-Side
Storage Compartment


- Disconnect harness connector for accelerator
pedal position sensor.

- Switch ignition on.

If specified values are obtained: - Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Specified value
1 + Ground (GND) about 5 V
1 + 5 about 5 V
2 + Ground (GND) about 5 V
2 + 3 about 5 V
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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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24-160
If no malfunctions are found in wires:

- Replace accelerator pedal position sensor.

Repair Manual, Fuel Supply System, Repair
Group 20


Note:
For vehicles with automatic transmission, the
kick down function must be learned Page 24
-
161
.
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24-161

Kick down function, adapting

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

Special Tools and Equipment

Requirements
Procedure
VAS5051 with VAG5051/1
orVAG1551 with VAG1551/3BNo DTCs in DTC memory, check DTC memory Page 01
-15
.
Engine not running, ignition switched on.
- Connect VAS5051 tester or VAG1551 scan tool and select the control
module for engine electronics using "address word" 01 Page 01
-9 .
Ignition must remain switched on for this.
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24-163


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 0 to 100 % 0 to 50 %
Kick
down operate
ADP in progress
ADP OK
ADP ERROR
Specified value 12 to 97 % 4 to 49 %
Kick
down ADP OK
Notes



If "ADP ERROR." is displayed: Check DTC memory
Page 01
-15
.
Notes:

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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pair&id=AUDI.B5.FU05.24.5