A3 Quattro V6-3.2L (BUB) (2008)
Knock Sensor: Testing and Inspection
Knock Sensors, Checking
The following procedure is used to diagnose all Knock Sensors.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The mounting bolt of Knock Sensor (KS) 1 (G61)/Knock Sensor (KS) 2 (G66) tightened to 20 Nm.
‹› The Motronic Engine Control Module (ECM) ( J220) fuses OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground (GND) connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Diagnostic Modes 01 - 09.
Start diagnosis
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Remove the engine cover with air filter.
‹› Before disconnecting the Knock Sensor electrical harness connectors, mark the component location.
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Disconnect the green Knock Sensor (KS) 1 (G61 ) electrical harness connector- 1 - or the gray Knock Sensor (KS) 2 (G66) electrical harness
connector - 2 -.