A4 Quattro Cabriolet V6-3.2L (BKH) (2007)
Knock Sensor: Testing and Inspection
Knock Sensors, Checking
The following procedure is used to check Knock Sensor (KS) 1 (G61) and Knock Sensor (KS) 2 (G66 ).
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
‹› Cylinders 1, 2, and 3 (bank 1) are monitored by Knock sensor (KS) 1 (-G61-). Cylinders 4, 5, and 6 (bank 2) are monitored by Knock sensor (KS)
2 (-G66-).
‹› Knock sensors themselves cannot be checked electrically.
‹› When servicing terminals in the harness connector of knock sensors, use only gold-plated terminals.
‹› For the knock sensors to function properly, it is important that the tightening torque be exactly 20 Nm.
‹› Contact surfaces between Knock Sensor (KS) 1 (G61 ) and Knock Sensor (KS) 2 (G66) and cylinder block must be free of corrosion, dirt and
grease.
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: Computers and Control Systems/Testing
and Inspection/Initial Inspection and Diagnostic Overview/General Diagnosis.
Start diagnosis
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Remove the rear engine cover - arrows -.