Passat Wagon L4-2.0L (ABA) (1995)
Knock Sensor: Testing and Inspection
Knock Sensor, Checking
KNOCK SENSOR, CHECKING
Special tools, testers and auxiliary items
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VAG 1598/18 test box
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Multimeter (Fluke 83 or equivalent)
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VW 1594 connector test kit
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Wiring diagram
Test sequence
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Disconnect brown 3-pin harness connector -2- from knock sensor 1 G61 socket -1-,
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Measure resistance between terminals 1 and 2, 1 and 3 and 2 and 3 at knock sensor connector socket.
Specification: Infinity Ohms (no continuity)
If the specification is attained:
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Connect VAG 1598/18 test box to ECM wiring harness.
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Check wiring between test box and 3-pin connector for open circuit according to wiring diagram.
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Terminal 1 and test box socket 34
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Terminal 2 and test box socket 33
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Terminal 3 and test box socket 56
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Wire resistance: Max. 1.5 Ohms
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Additionally check wires for short to one another.
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Terminal 3 and test box socket 34
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Terminal 3 and test box socket 33
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Terminal 2 and test box socket 34
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Specification: Infinity ohm (no continuity)
If no wiring malfunction is detected:
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Loosen knock sensor and tighten again to 20 Nm (15 ft lb).
If the malfunction is still present (stored again in DTC memory):
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Replace knock sensor.