Passat Sedan V6-2771cc 2.8L DOHC (AHA) (1998)
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Disconnect 3-pin connector from Knock Sensor (KS) 1 -G61- -1- and/or 3-pin connector from Knock Sensor (KS) 2 -G66- -2-.
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Connect multimeter US1119 (Fluke 83 or equivalent) to measure resistance between connector terminals, using adapters from VW1594 connector
test kit.
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Knock sensor terminals 1 and 2
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Knock sensor terminals 1 and 3
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Knock sensor terminals 2 and 3
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Specified value: Infinity Ohms
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Connect VAG1598/22 test box to Motronic ECM harness connector.
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Check wiring for open circuit between ECM/test box and 3-pin harness connector using appropriate wiring diagram.
Knock Sensor (KS) 1 -G61-:
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Connector terminal 1 to ECM/test box socket 68
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Connector terminal 2 to ECM/test box socket 67
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Connector terminal 3 to ECM/test box socket 67
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Specified value: max. 1.5 Ohms
Knock Sensor (KS) 2 -G66-:
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Connector terminal 1 to ECM/test box socket 60
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Connector terminal 2 to ECM/test box socket 67
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Connector terminal 3 to ECM/test box socket 67
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Specified value: max. 1.5 Ohms
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Check wires at test box socket 67 for short to test box sockets 60 and 68.
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Specified value: Infinity Ohms
If wiring is OK:
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Loosen knock sensor and tighten again to 20 Nm (15 ft lb).
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Road test again and check knock sensor control specifications on display.