AUDI A4 1996 B5 / 1.G APB Engine Ignition System Checking
Manufacturer: AUDI, Model Year: 1996, Model line: A4, Model: AUDI A4 1996 B5 / 1.GPages: 64, PDF Size: 0.37 MB
Page 41 of 64
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Display Group 21 -Ignition- Knock control
Driving mode
Read measuring value block 21
Indicated on display
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control: cylinder 6
0...12 KW
(crankshaft angle)
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Ignition timing retard via knock control: cylinder 5
0...12 KW
(crankshaft angle)
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Note:
The displayed digit values in display fields 1 and 2 reflects the actual "ignition timing retard" via knock control from the
individual cylinders. The ignition timing retard occurs via KW (crankshaft angle).
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Page 42 of 64
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Display Group 22 -Ignition- Knock control
Driving mode
Read measuring value block
22
Indicated on display
xx.x RPM x.x %
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control:
cylinder 2 0...12 KW
(crankshaft
angle)
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Ignition timing retard via knock control:
cylinder 1
0...12 KW
(crankshaft
angle)
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Engine load 15 - 175 %
Engine speed RPM
750 - 6800 RPM
Note:
The displayed digit values in display fields 3 and 4 reflects the actual "ignition timing retard" via knock control from cylinders 1
and 2. The ignition timing retard occurs via KW (crankshaft angle).
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Page 43 of 64
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Display Group 23 -Ignition- Knock control
Driving mode
Read measuring value block
23
Indicated on display
xx.x RPM x.x %
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control:
cylinder 4 0...12 KW
(crankshaft
angle)
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Ignition timing retard via knock control:
cylinder 3
0...12 KW
(crankshaft
angle)
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Engine load 15 - 175 %
Engine speed RPM
750 - 6800 RPM
Note:
The displayed digit values in display fields 3 and 4 reflects the actual "ignition timing retard" via knock control from cylinders 3
and 4. The ignition timing retard occurs via KW (crankshaft angle).
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Page 44 of 64
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Display Group 24 -Ignition- Knock control
Driving mode
Read measuring value block
24
Indicated on display
xx.x RPM x.x %
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control:
cylinder 6 0...12 KW
(crankshaft
angle)
Page 28
-40
Ignition timing retard via knock control:
cylinder 5
0...12 KW
(crankshaft
angle)
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Engine load 15 - 175 %
Engine speed RPM
750 - 6800 RPM
Note:
The displayed digit values in display fields 3 and 4 reflects the actual "ignition timing retard" via knock control from cylinders 5
and 6. The ignition timing retard occurs via KW (crankshaft angle).
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Page 45 of 64
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Evaluation display groups 20/21/22/23/24, - Ignition timing angle retard Indicated on display
Malfunction cause
Corrective action
All cylinders greater
than 12 KW
Knock sensor faulty- Check knock sensor Page 28
-41
.
Corroded connection
Knock sensor incorrect
tightening torque - Loosen and tighten knock sensor with 20 Nm (15 ft lb)
Components on engine
loose - Tighten components
Low fuel grade- Change fuel grade
One cylinder deviates
clearly from others Corroded connection- Check knock sensor Page 28
-41
.
Engine damage
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine
Code(s): APB, Repair Group 15, Cylinder head removing, check compression pressure
- Check compression pressure:
Components on engine
loose - Tighten components
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Page 46 of 64
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Knock Sensor (KS) 1 -G61 and Knock
Sensor (KS) 2 -G66, checking
Notes:
It is not possible to carry out an electrical test of
the knock sensors themselves.
To ensure that the knock sensors function
properly it is important to keep exactly to the
specified tightening torque of 20 Nm (15 ft lb)
Use only gold-plated terminals when repairing
the terminals in the plug connectors for the
knock sensors.
Check for corrosion in connection between
knock sensor and wiring harness.
Checking knock sensors
Note: - Disconnect harness connector for relevant knock sensor in engine
compartment.
Component location overview Page 24
-5 .
In order to reach the connector for the knock sensor for cylinder bank
2, first remove the bolts securing the coolant reservoir and move the
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Page 47 of 64
coolant reservoir to one side. Coolant hoses remain attached.
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Page 48 of 64
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If there is a connection between the terminals.
Notes:
If there is no short circuit
Checking wiring between knock sensors and engine control module - Check for short circuits between all three terminals in knock sensor
connector (terminals 1 + 2, 1 + 3 and 2 + 3).
Specified value: There must be no contact between the wires (infinite
). - Replace knock sensor.
In order to reach the knock sensors, first remove the air duct Page 24
-43
.
Use special tool 3247 to remove the knock sensors.
- Check wiring for knock sensors.
- Connect VAG1598/31 test box to wiring harness for engine control
module. Do not connect to the engine control module itself Page 24
-
20
.
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Page 49 of 64
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- Check wiring connection from relevant sensor connector to...
- ....Engine Control Module (ECM) for open circuit and/or short to B+ or
Ground (GND).
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Page 50 of 64
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Knock Sensor (KS) 1 -G61 (Bank 1)
3-pin connector on
wiring harness, socket
VAG1598/31 test
box, socket
1 (Ground (GND)) 99
2 (signal) 106
3 (shielded) 108
Knock sensor (KS) 2 -G66 (Bank 2)
3-pin connector on
wiring harness, socket
VAG1598/31 test
box, socket
1 (Ground (GND)) 99
2 (signal) 107
3 (shielded) 108
Resistance in wiring: max. 1.5 ohm
- Repair any open/short circuit as necessary.
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