AUDI A4 1999 B5 / 1.G APB Engine Charge Air System With Turbocharger Workshop Manual
A4 1999 B5 / 1.G
AUDI
AUDI
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AUDI A4 1999 B5 / 1.G APB Engine Charge Air System With Turbocharger Workshop Manual
Page 21 of 37
21-18
If display field 4 indicates a correction factor <0
%, intake air is too hot or the sensor for intake air
temperature is faulty.
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24
- Select measuring value block 114.
Display fields
1 2 3 4
Display group 114: Charge air pressure regulation
Display
%
%
% %
Indicated
Specified engine load (without
correction) Specified engine load (after
correction) Actual
load Duty cycle
CAPR-cyclical
valve
Specified
value 136,0
134,3
137,5 55,2
Note: Load values in display fields 1 to 3 can deviate
from each other by up to 5 %. If specified values are not achieved in the
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Page 22 of 37
measuring value blocks:
- Check the charge air pressure sensor -G31-.
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Page 32 of 37
21-27
Charge air pressure sensor -G31-,
checking
Special tools and equipment
VAG 1526A
VAG 1594A
VAG 598/31
VAS 5051 with VAG 5051/1
- or
VAG 1551 with VAG 1551/3A
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Page 33 of 37
21-28
Note:
The charge air pressure sensor -G31- and wire
connections are monitored by the Engine Control
Module (ECM).
- Connect VAS 5051 tester or VAG 1551 scan
tool and select control module for engine
electronics using "address word" 01. Engine
must run at idle.
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
- Check DTC memory of Engine Control Module
(ECM).
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
If a Diagnostic Trouble Code (DTC) relating to
the charge air pressure sensor -G31- is
indicated:
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Page 34 of 37
21-29
Checking voltage supply
- Switch ignition off.
- Remove engine cover (arrows).
- Disconnect connector at charge air pressure sensor.
If specified value is not obtained: - Connect multimeter between terminal 1 and 3 of harness connector for
voltage measurement.
- Switch ignition on.
Specification: about 5 V
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Page 36 of 37
21-31
Checking signal wire
- Disconnect harness connector at charge air
pressure sensor.
- Connect multimeter to socket 101 and socket
108 of test box for voltage measurement.
- Start engine and run at idle.
Specification: about 1.90 V
- Bring engine to RPM by depressing pedal
suddenly.
Specification: approx. 2.00 ... 3.00 V
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Page 37 of 37
21-32
If specified values are not obtained:
If wire connection is OK: - Check following wire connection for open circuit and short circuit to
Ground (GND) and B+: Harness connector terminal
VAG 1598/31 or test box
Bushing
4 101
- Repair open circuit or short circuit if necessary.
- Replace charge air pressure sensor -G31-.
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