Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
Knock Sensor: Testing and Inspection
Knock sensor, checking
NOTE:
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Knock sensor torque must be maintained at 20 Nm (15 ft lb) to ensure the knock sensors function correctly.
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Only gold-plated terminals may be used when servicing the knock sensor connector terminals.
Special tools, testers, measuring instruments and auxiliary items required
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VAG 1598/22 Test Box
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Fluke 83 multimeter
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VW 1594 Adaptor kit
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VAG 1527 B Voltage tester
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Wiring diagram
Test conditions
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On Board Diagnostic must have recognized a DTC for one or both knock sensors.
Checking function
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Functional check of knock control and knock sensors, See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing and
Procedures/Read Measuring Value Blocks (Function 08)/Reading Measuring Value Blocks "Read measuring value block" display groups 14 to 16
and 24
Checking resistances and wiring
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Disconnect 3-pin harness connector (green) to knock sensor 1 G61 -1- and / or 3-pin connector (blue) to knock sensor 2 (G66) -2-.
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Measure resistance between the terminals 1 + 2, 1 + 3 and 2 + 3 at connections to knock sensors.
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Specification Infinity Ohms
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Connect test box VAG 1598/22 to Engine Control Module wiring harness.
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Check wiring for open circuit between Test Box and 3-pin harness connector using wiring diagram.