Jetta Sedan V6-2.8L (BDF) (2003)
Knock Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Knock Sensor, Checking
NOTE:
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The terminal surfaces between Knock sensor (KS) and cylinder block must be free of corrosion, dirt and grease.
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Knock sensor (KS) 2 -G66- has a direct 2-pin connector and therefore no terminal for the shielding in the connector.
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It is extremely important to keep to the torque setting of 20 Nm to ensure the Knock sensors (KS) perform perfectly.
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Only gold-plated terminals may be used when servicing the Knock sensor (KS) connector terminals.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
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VAG 1551 Scan tool (or VAG 1552 Scan tool) with VAG 1551/3 adapter cable
NOTE: All functions which could previously be performed with VAG 1551/1552 can also be performed with the VAS 5051.
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VAG 1526 Hand multimeter or VAG 1715 multimeter
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VAG 1594 adapter set
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VAG 1598/31 test box
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Electrical Wiring Diagrams
Test prerequisites
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The fuses must be OK.
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The battery voltage must be at least 11.5 V.
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All electrical accessories, e.g. lights and rear window heating must be switched off.
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If the vehicle is equipped with air conditioning, it must be turned off.
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Selector lever must be in position "P" or "N" on vehicles with an automatic transmission.
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Knock sensor (KS) malfunction detected by On Board Diagnostic (OBD). Refer to "Computers and Control Systems/Testing and Inspection".
See: Computers and Control Systems/Testing and Inspection
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The signal from brake light switch and brake pedal switch must be OK, Checking.
See: Computers and Control Systems/Brake Signal/Testing and Inspection
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Engine Coolant Temperature (ECT) must be at least 85 degrees C, See display group 28, display zone 3.