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

15-19

- Remove cover panel from cylinder head cover
(cylinder bank 4-6).

- Release hose clamp -arrow-.
- Remove upper section of intake line -1-.
- Disconnect hose -2-.

- Disconnect hose (arrow).
- Remove bolt securing toothed belt guard from cylinder head cover.
- Pull plug connectors off ignition coils.
- Pull crankcase breather off cylinder head cover.
- Remove cylinder head cover.
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15-24


Installing
Install in reverse sequence; note the following points: - Pull off hose -1-.
- Pull plug connectors off ignition coils.
- Pull crankcase breather off cylinder head cover.
- Remove ignition coils.
- Remove cylinder head cover.

- Seal end points of joints between bearing caps and cylinder head.
- Before installing cylinder head cover and gasket, carefully apply a
small quantity of sealant D 454 300 A2 at four end points of sealing
surfaces on cylinder head -arrows-, using a small screwdriver.
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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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15-28

- Remove bolt securing toothed belt guard from
cylinder head cover.

- Unplug connectors from ignition coils.

- Pull crankcase breather off cylinder head
cover.

- Remove ignition coils.

- Remove cylinder head cover.

Installing
Install in reverse sequence; note the following
points.

- Seal end points of joints between bearing caps and cylinder head.
- Before installing cylinder head cover and gasket, carefully apply a
small quantity of sealant D 454 300 A2 at four end points of sealing
surfaces on cylinder head -arrows-, using a small screwdriver.
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15-30


- Unplug connector for camshaft timing control -1- (cylinder bank 4..6).
- Unplug connectors from injectors -2- (cylinder bank 4..6).
- Unplug connectors from ignition coils -3- and move wiring harness
clear (cylinder bank 4..6).
- Pull crankcase breather -4- off cylinder head cover (cylinder bank 4..6).
- Remove ignition coils.

- Unplug connectors from injectors -2- (cylinder bank 1..3).
- Pull off hose -5- going to turbocharger intake side.
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15-44


- Unplug connectors from injectors -2- (cylinder bank 4..6).

- Unplug connector for camshaft timing control -1- (cylinder bank 1..3).
- Unplug connectors from injectors -2- (cylinder bank 1..3).
- Unplug connectors from ignition coils -3- and move wiring harness
clear (cylinder bank 1..3).
- Pull crankcase breather -4- off cylinder head cover (cylinder bank 1..3).
- Pull off hose -5- going to turbocharger intake side.
- Remove ignition coils.
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15-61


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

- Remover cover panel from right-hand cylinder head cover -arrows-.
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15-63

- Pull crankcase breathers off cylinder head
covers.

- Pull plug connectors off ignition coils.

- Remove ignition coils.

- Unplug connectors from all 6 injectors.

- Disconnect 5-pin connecter at power output
stage of ignition coils.

- Open throttle fully.

- Use compression tester VAG 1381 or VAG
1763.

- Operate starter until pressure reading on tester
no longer rises.

Compression pressure values

New
Wear
limit Max. permissible difference
between cylinders
9 ... 13
bar 7 bar 3 bar
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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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