1996 AUDI A8 wiring

28-31

Test requirements:

Fuse for Engine Control Module (ECM) OK

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder

Battery voltage at least 12.7 V
Generator OK

Test sequence

- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17
.

- Switch ignition on.

Note:

The plus voltage supply for the Engine Control
Module (ECM) travels via connector terminal 3
(terminal 15) and connector terminal 62
(terminal 30).
Ground (GND) supply of the Engine Control
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- Check wire connections.

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder
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Component location Overview of Component
Locations, page Page 24
-5

Notes:

Knock Sensor (KS) 1 -G61- and Knock Sensor
(KS) 2 -G66- themselves cannot be electrically
tested.
Use only gold-plated terminals when servicing
harness connector for knock sensors.
For the knock sensors to function properly, it is
important that tightening torque be exactly 20
Nm.
Check harness connector from knock sensor to
wiring harness for corrosion.

Check knock sensors

Note:
Coolant reservoir screws must be removed and coolant reservoir must be
placed to side in order to access harness connector for knock sensor for
bank 2. The coolant hoses can remain connected. - Disconnect the harness connector of the relevant knock sensor in
engine compartment.
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28-43


Check wires from knock sensors to Engine Control Module (ECM). - Check all three terminals at knock sensor connector for short circuit to
each other (terminal 1+2, 1+3, 2+3).

Specification: (no continuity) - the wires must not have any
connection to each other.
- If there is no connection , replace knock sensor.
- If no short circuit is detected, check knock sensor wires:
- Connect VAG1598/31 test box at wiring harness to ECM, do not
connect ECM Page 24
-17
.
- Check the following wire connections for open circuit and short circuit
to Ground (GND) and B+:

Knock Sensor (KS) 1 -G61- Harness connector
Terminal
VAG1598/31 test box
Socket
1 (signal) 106
2 (Ground -GND-) 99
3 (shielding) 108
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28-49
If specified values are not obtained:

Checking wire connections between
Camshaft Position (CMP) sensor and Engine
Control Module (ECM)

- Connect VAG1598/31 test box at wiring harness
to ECM, do not connect ECM Page 24
-17
.

Camshaft Position (CMP) Sensor 2 -G40- (bank 2)
Camshaft Position (CMP) Sensor 2 -G163- (bank 1) - Check the following wire connections for open circuit and short circuit
to Ground (GND) and B+: Harness connector
Terminal
VAG1598/31 test box
Socket
1 (B+) 98
2 (signal) 86
3 (Ground -GND-) 108
Harness connector
Terminal
VAG1598/31 test box
Socket
1 (B+) 98
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