Checking knock sensor wiring
- Disconnect electrical 3-pin harness connector -2- for Knock Sensor (KS) 1 -G61-.
- Disconnect electrical 3-pin harness connector -3- for Knock Sensor (KS) 2 -G66-.
Courtesy of AUDI OF AMERICA, INC.
NOTE: To reach the harness connectors, the left cover in engine compartment must be removed, the line to Engine Coolant Level (ECL) Warning Switch at bottom on reservoir must be disconnected, and the bolt -arrow- of the coolant reservoir must be unscrewed and set aside. Coolant hoses -1- to -3- remain connected. - Check all three terminals at knock sensor connector for short circuit to each other (terminal 1 + 2, 1 + 3, 2 + 3).
- Specified value: INFINITY Ω (no continuity) - the wires must not have any connection to each other
- If there is a connection, replace knock sensor.
If no malfunction can be found: