Q7 Quattro V6-3.6L (BHK) (2007)
Knock Sensor: Testing and Inspection
Knock Sensors, Checking
The following procedure is used to diagnose both Knock Sensors.
Special tools, testers and auxiliary items required
‹› Multimeter.
‹› Wiring diagram.
Test requirements
‹› The mounting bolt of Knock Sensors 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 => [ Preliminary Check ] See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
‹› Before disconnecting the Knock Sensor electrical harness connectors, mark the component location.
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Disconnect Knock Sensor (KS) 1 (G61) - 2 - electrical harness connector.
OR
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Disconnect Knock Sensor (KS) 2 (G66) - Arrow - electrical harness connector.