A8 Quattro Sedan V8-4.2L (BGK) (2006)
Knock Sensor: Testing and Inspection
Knock Sensors, Checking
‹› For the knock sensors to function properly, it is important that tightening torque be exactly 20 Nm.
‹› Use only gold-plated terminals when servicing terminals in harness connector of knock sensors.
‹› Check harness connector from knock sensor to wiring harness for corrosion.
Component location of harness connectors.
1. 3-pin harness connector for Knock Sensor (KS) 1 (G61), cylinder bank 1
2. 3-pin harness connector for Knock Sensor (KS) 2 (G66), cylinder bank 2
Knock Sensors, Checking
-
Disconnect the harness connector of the relevant knock sensor in engine compartment.
-
Check all three terminals at respective knock sensor connector for short circuit to each other (terminal 1+2, 1+3, 2+3).
Specified value: Wires should have no connection to each other (infinite Ohm).
-
If there is a connection, replace knock sensor.
-
If wires have no connection to each other, check the wire connections.
Wires from Knock Sensors to ECM, Checking