wiring AUDI A4 1999 B5 / 1.G AWM Engine Charge Pressure Leak Test Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1999, Model line: A4, Model: AUDI A4 1999 B5 / 1.GPages: 34, PDF Size: 0.51 MB
Page 16 of 34
21-27
Test requirements:
Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool
connected.
Test sequence
Note:
The recirculating valve for turbocharger -N249-
and the wiring connections are monitored by the
engine control module.
- Read Diagnostic Trouble Code (DTC) memory
of engine control module.
If a DTC relating to the recirculating valve for
turbocharger -N249- is displayed:
Note:
The illustration shows bottom view of removed intake line. - Remove hoses of recirculating valve for turbocharger -N249- (-1-). The
electrical connector remains plugged in.
Location: below intake line
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Page 19 of 34
21-30
Checking power supply
Note:
The power supply for the recirculating valve is via
the fuel pump relay.
Test requirements:
Fuse for recirculating valve OK.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Fuel pump relay OK.
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
- Disconnect wiring connector from valve.
- Connect voltage tester VAG 1527 B as follows:Connector
Measure to
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Page 21 of 34
21-31
If the LED does not light up:
- Check wiring from contact 1 on connector via
fuse to fuel pump relay for an open circuit:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
- Repair open circuit, if necessary.
If the LED lights up:
- Check actuation.
Checking actuation
- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and activate recirculatiing
valve for turbocharger -N249-.
The LED must flash.
Pa
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Page 22 of 34
21-32
If the LED lamp does not flash or if it lights up
continuously:
- Connect VAG 1598/31 test box to wiring
harness leading to engine control module;
engine control module should not be connected:
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
If the wiring is OK: - Check for open circuit and short to positive or Ground in following
wiring connection: Connector
Contact
Test box VAG 1598/31
2 105
- Repair any open/short circuit as necessary.
- Replace engine control module.
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Page 24 of 34
21-34
Test requirements:
Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551 Scan Tool
connected.
Test sequence
Note:
The Wastegate Bypass Regulator valve -N75-
and the wiring connections are monitored by the
engine control module.
- Read Diagnostic Trouble Code (DTC) memory
of engine control module.
If a DTC relating to the Wastegate Bypass
Regulator valve -N75 is displayed:
- Disconnect hoses from valve but leave electrical
connector attached.
- Connect auxiliary hose to valve connector marked with an arrow.
- Initiate output Diagnostic Test Mode (DTM) and actuate Wastegate
Bypass Regulator valve -N75-.
Pa
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Page 26 of 34
21-36
Checking power supply
Test requirements:
Fuse for wastegate bypass regulator valve
OK
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
Fuel pump relay OK.
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
- Connect voltage tester VAG 1527 B as follows:Connector
contact
Measure to
1 Engine Ground
- Operate starter briefly.
LED must light up.
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Page 27 of 34
21-37
If the LED does not light up:
- Check wiring from contact 1 on connector via
fuse to fuel pump relay for open circuit:
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
- Repair open circuit, if necessary
If the LED lights up:
- Check actuation.
Checking actuation
- Connect voltage tester VAG 1527 B to contacts 1 (positive) and 2 of
connector.
- Initiate output Diagnostic Test Mode (DTM) and actuate Wastegate
Bypass Regulator valve -N75-.
Output Diagnostic Test Mode
Display
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ge pressure leak test with VAG 1687
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Page 29 of 34
21-38
If the LED lamp does not flash or if it lights up
continuously:
- Connect VAG 1598/31 test box to wiring
harness leading to engine control module;
engine control module should not be connected:
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel
Injection & Ignition, Engine Code(s): AWM, Repair Group 24
If the wiring is OK: - Check for open circuit and short to positive or Ground in following
wiring connection: Connector
Contact
Test box VAG 1598/31
2 104
- Repair any open/short circuit as necessary.
- Replace engine control module.
Pa
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ge pressure leak test with VAG 1687
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Page 31 of 34
21-40
Test requirements:
Vehicle diagnostic, testing and information
system VAS 5051 or VAG 1551Scan Tool
connected.
Test sequence
Note:
The Charge Air Pressure sensor -G31- and the
wiring connections are monitored by the engine
control module.
- Read Diagnostic Trouble Code (DTC) memory
of engine control module.
If a DTC relating to the Charge Air Pressure
sensor -G31- is displayed:
Checking power supply
- Disconnect connector -arrow- on charge pressure sender.
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Page 32 of 34
21-41
If specified value is not attained: - Connect multimeter between contacts 1 and 3 of connector to measure
voltage.
- Switch ignition on.
Specified value: approx. 5 V
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Fuel Injection & Ignition,
Engine Code(s): AWM, Repair Group 24
- Connect VAG 1598/31 test box to wiring harness leading to engine
control module; engine control module must also be connected.
Pa
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ge pressure leak test with VAG 1687
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