ignition AUDI A4 2000 B5 / 1.G APB Engine Charge Air System With Turbocharger Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 2000, Model line: A4, Model: AUDI A4 2000 B5 / 1.GPages: 37, PDF Size: 0.48 MB
Page 10 of 37
21-10
Requirements for test:
Diagnostic Trouble Code (DTC) memory has
been interrogated
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
Output Diagnostic Test Mode (DTM) has
been performed
Engine oil temperature at least 60 C
All vacuum connections airtight
- Loosen bolts -arrows- and remove engine cover panel -B-.
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Page 15 of 37
21-14
Test sequence
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 01
- 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.
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 displa
y group number XXX
When indicated on display
- Press buttons -1-, -1- and -5- to select "display group number 115" and
press -Q- button to confirm input.
Read Measuring Value Block 115
Indicated on display (1...4 display fields)
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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 24 of 37
21-20
Note:
The recirculating valve for turbocharger -N249
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 for this.
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 recirculating valve for turbocharger -N249- is
displayed:
-
Disconnect hoses from valve; harness connector
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Page 26 of 37
21-21
- Initiate output Diagnostic Test Mode (DTM) and
activate recirculating valve for turbocharger -
N249-.
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
Output diagnostic test mode Recr. valve for turbocharger -N249
Indicated on display
If valve does not click:
If valve does not open and close properly: Valve must click...
...and must open and close (can be tested by blowing into assisting
hose).
- Check internal resistance of valve.
- Replace recirculating valve for turbocharger -N249-.
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Page 29 of 37
21-24
If LED does not light:
- Check wire connection from terminal 1 to Fuel
Pump (FP) relay via fuse for open circuit.
Electrical Wiring Diagrams, Troubleshooting &
Component Locations
- Repair open circuit if necessary.
If wire connection is OK:
- Check Fuel Pump (FP) relay.
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24
If LED lights:
- Check activation, Page 21
-25
.
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Page 30 of 37
21-25
Checking activation
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 01
If LED does not blink or if it remains constantly lit:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24
- Connect VAG 1527B voltage tester to connector terminals 1 (B+) and
2.
- Initiate output Diagnostic Test Mode (DTM) and activate recirculating
valve for turbocharger -N249-.
LED must blink.
- Connect VAG 1598/31 test box at wiring harness to ECM. Do not
connect ECM.
- Check the following wire connections for open circuit and short circuit
to Ground (GND) and B+: Harness connector terminal
VAG 1598/31 test box
Bushing
2 9
- Repair open circuit or short circuit if necessary.
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Page 31 of 37
21-26
If wire connection is OK:
- Replace Engine Control Module (ECM).
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 24
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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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