A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
Knock Sensor: Testing and Inspection
Knock Sensors, Checking
The following procedure is used to diagnose Knock Sensor (KS) 1 (G61)/Knock Sensor (KS) 2 (G66 ).
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 Engine Control Module (ECM) ( J623) 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: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/General Diagnosis.
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Remove engine cover - arrows -.
Start diagnosis
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Disconnect the Knock Sensor (KS) 1 (G61) electrical harness connector- 1 - or the Knock Sensor (KS) 2 (G66) electrical harness connector - 2 -.