Volkswagen Workshop Service and Repair Manuals

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Disconnect black 3-pin harness connector to knock sensor 2 (arrow).

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Switch multimeter to resistance range.

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Measure resistance between knock sensor terminals, connecting as follows:
between terminals 1 + 2
between terminals 1 + 3
between terminals 2 + 3
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specification: infinity Ohms

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Check for open circuit between Test Box and 3-pin harness connector using wiring diagram, connecting as follows: