fuel pressure AUDI A6 2000 C5 / 2.G AHA ATQ Engines Valve Gear Service Manual

15-20


- Disconnect blue harness connector on Intake Manifold Tuning (IMT)
valve.
- Disconnect black harness connector for intake air temperature sensor
on resonator.
- Cut tie wraps and move wiring to side.
- Disconnect vacuum line at cruise control vacuum diaphragm and at
vacuum booster.
- Unbolt cruise control vacuum diaphragm and unhook cruise control
vacuum diaphragm linkage at throttle body.
- Disconnect harness connector on throttle body and vacuum lines on
fuel pressure regulator.

- Disconnect harness connectors from camshaft adjustment valve and
from fuel injectors (arrows).
- Disconnect harness connectors from Engine Coolant Temperature
(ECT) sensor and Camshaft Position (CMP) sensor (arrows).
- Cut tie wraps on valve cover.
- Unclip wiring retainer on fuel rail and disconnect crankshaft housing
ventilation lines from left and right-side valve covers. Move hoses and
wiring clear (to rear).
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15-29

Compression, checking


Test conditions

Engine oil temperature at least 30 C

Battery fully charged

- Disconnect harness connectors from all 6 fuel
injectors.

- Disconnect 5-pin harness connector from power
output stage of ignition coils.

- Open throttle fully.

- Use VAG1381 or VAG1763 compression tester
to check compression.

- Operate starter until no further pressure
increases are indicated by VAG1381 or
VAG1763 compression tester.

Compression pressure
New
Wear
limit Max. permissable
difference between
cylinders
Pa
ge 34 of 62 Valve
gear, servicin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE03.15.1