fuel AUDI A4 1999 B5 / 1.G APB Engine Valve Gear Service Workshop Manual

15-26

WARNING!

Fuel system is under pressure. Before
opening the system, place a cloth around the
connection. Then release pressure by
carefully loosening the connection.

- Disconnect fuel supply line and fuel return line -1- and -2-, and move
fuel lines clear.
- Pull hose off EVAP valve -3-.

- Unplug connector -1- from air mass meter.
- Unplug connectors -2- from ignition output stages, and move wiring
clear.
- Remove air cleaner.
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15-60


WARNING!
Fuel system is under pressure. Before opening the system, place a
cloth around the connection. Then release pressure by carefully
loosening the connection. - Pull off hose -1-.

- Disconnect fuel supply line and fuel return line -1- and -2-, and move
fuel lines clear.
- Pull hose off EVAP valve -3-.
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15-64

Installing
Install in reverse sequence; note the following
points.

- install fuse No. 28 (for fuel pump).

- Erase Diagnostic Trouble Code (DTC)
memory.

Note:
Malfunctions will have been stored in the
memory because the connector to the Hall
sensor has been unplugged. Therefore
interrogate and erase the DTC memory after the
test.

Tightening torque

Component
Nm
Ignition coils to cylinder head 10
Spark plugs in cylinder head 30
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15-67

Test sequence

- 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

Rapid data transfer
HELP
Select Function XX

When indicated on display
- Press buttons -0- and -4- to select "Initiate basic setting" and press -Q-
button to confirm input.
Initiate basic settin
g
Q
Input display group number XXX

When indicated on display
- Press buttons -0-, -9- and -4- to select "display group number 094" and
press -Q- button to confirm input.
System in basic setting 94
1
2
3
4

When indicated on display
Camshaft adjustment is checked for function.
- Increase engine speed to above 2000 RPM.
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15-70

- Initiate output Diagnostic Test Mode (DTM) and
activate the valve for camshaft adjustment.

Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01

If valves do not click during output Diagnostic
Test Mode (DTM):

Checking internal resistance

- Switch ignition off.

- Remove bolts (arrows) and remove engine covers -A- and -B-.

- Remove air distributor (arrows).
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15-72


Electrical Wiring Diagrams, Troubleshooting & Component Locations
If no malfunctions are detected:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition,
Engine Code(s): APB, Repair Group 24

Check wire connection from terminal 1 of connector via fuse -S234-
(in fuse holder, socket 34) to Fuel Pump (FP) relay for open circuit:
- Repair open circuit if necessary.
- Check Fuel Pump (FP) relay.
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15-73

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 between terminal 1 (+) and 2.
- Initiate output Diagnostic Test Mode (DTM) and activate valve for
camshaft adjustment.

LED must blink.
- Connect VAG 1598/31 test box at wiring harness to ECM, do not
connect ECM.
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15-74


Valve 1 for camshaft adjustment -N205- and valve 2 for camshaft
adjustment -N208-
If wire connection is OK:
Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel Injection & Ignition, Engine Code(s): APB, Repair Group 24

If no malfunctions are detected: - Check following wire connections for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
terminal
VAG 1598/31 or test box
Bushing
2 Electrical Wiring Diagrams, Troubleshooting
&Component Locations
- Repair Ground (GND) connection or open circuit if necessary.
- Replace Engine Control Module (ECM).- Replace mechanical camshaft adjuster.
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