Manufacturer's Scan Tool

Knock Sensors, Checking

Special tools, testers and auxiliary items required

• (VAG1526A)

• (VAG1594A)

• (VAG1598/31)

• The Knock Sensor (KS) 1 (G61) and Engine Coolant Temperature (ECT) sensor (G62) cannot be tested by themselves electrically.

• Use only gold-plated terminals when repairing the cable connectors for the knock sensors.

• Make sure that the knock sensors function properly it is important to keep to the specified tightening torque of 20 Nm.

• Check connector between knock sensor and wiring harness for corrosion.

Testing knock sensor wiring

- Disconnect connector of relevant knock sensor => [ Identification of connector bracket - right
side of vehicle ] Locations or => [ Identification of connector bracket - left side
of vehicle ] Locations

- Test for short between all three terminals in knock sensor connector (terminals 1+2, 1+3, 2+3).





• Specified value: infinite ohms (no continuity) - the wires must not be connected to each other.

- If there is a connection between terminals, install a new knock sensor.

If no malfunction is found:

Checking wiring from knock sensors to engine control module

- Connect test box (VAG1598/31) to wiring harness for engine control module; do not connect engine control module. Refer to => [ Wiring and Component Check with Test Box VAG 1598/31 ] Wiring and Component Check With Test Box VAG 1598/31.

- Check for open circuit and short to ground/positive or ground in following wiring connections:

• Knock Sensor (KS) 1 (G61) (Bank 1)









• Knock Sensor (KS) 2 (G66) (Bank 2)





- Repair any open/short circuit as necessary.