A4 Sedan V6-2.8L (AFC) (1996)
Knock Sensor: Testing and Inspection
NOTE:
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To functionally check knock sensors, refer to Read measuring value block, display group 015 and/or 016.
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Component locations, refer to "Component Overview - I " See: Fuel Delivery and Air Induction/Locations
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Knock sensors can not be checked electrically, check DTC memory.
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Use connector insertion tool 3247 for knock sensor removing and installing.
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It is important that exact knock sensor tightening torque of 20 Nm (15 ft lb) be maintained to make sure that there is proper knock sensor function.
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Visually check the knock sensor connector for corrosion.
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When repairing or replacing knock sensor connector terminals, ONLY replace with gold plated terminals.
Checking knock sensor wiring
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Disconnect knock sensor harness connectors in engine compartment.
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Check all three terminals in knock sensor harness connector for shorting to each other.
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Wires must not be short circuited to each other
If there is a short circuit:
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Replace knock sensor.
Checking wiring between knock sensor and ECM
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Connect VAG 1598/19 test box to ECM harness connector.
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Check wiring for continuity or short between knock sensor and ECM using wiring diagram.
Terminal assignments (inside connector)
1
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Ground (GND) wire
2
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Signal wire
3
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Shield
Knock Sensor (KS) 1 -G61-
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Check signal wire for continuity between harness connector terminal 2 (in engine compartment) and test box socket A13.
Specified value: max. 1 ohm
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Check Ground (GND) wire for continuity between harness connector terminal 1 and test box socket A14.
Specified value: max. 1 ohm
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Check shielding for continuity between harness connector terminal 3 (in engine compartment) and engine Ground.
Specified value: max. 1 ohm