Knock Sensor: Service and Repair

WM 287220 Removing and installing knock sensors on DFI engines

Technical values

Information

Component overview

Ignition system

Removing right knock sensor

Removing right knock sensor

1. Remove intake manifold. -> 243519 Removing and installing air box for throttle housing on DFI engines (intake pipes upstream of throttle valve) Service and Repair
2. Remove connector on the right knock sensor (under the exhaust manifold) at the front of the cylinder head cover and release the socket -A, B and E in bottom part of illustration-.

Right cable lead

3. Unscrew the right knock sensor (under the exhaust manifold). To do this, loosen the fastening screw -arrow- and remove the knock sensor. Unclip cable. Remove knock sensor.

Right knock sensor

Installing right knock sensor

Installing right knock sensor

CAUTION

Engine damage and changed exhaust behaviour due to incorrectly mounted knock sensors.

-> The precise tightening torque for the knock-sensor screw must be observed, otherwise the proper function of the knock sensor is not ensured.
-> The knock sensors must a aligned so that the sensor housing and the cable plug do not touch anywhere, otherwise proper functioning of the knock sensor is not ensured.

Information

- Clean contact surface of knock sensor with a cloth.

1. Position knock sensor with fastening screw on the cylinder block. Route the cable so that it is facing the front of the vehicle. Clip in cable. Tighten the fastening screw.=> Tightening torque: 20 Nm (15 ftlb.)

Fastening screw

2. Fit cable plug.
3. Fit the intake manifold. -> 243519 Removing and installing air box for throttle housing on DFI engines (intake pipes upstream of throttle valve) Service and Repair

Removing left knock sensor

Removing left knock sensor

1. The left knock sensor is difficult to reach under the intake-air distributor. First, remove the intake-air distributor. -> 244619 Removing and installing DFI intake-air distributor Overhaul

Installation position of left knock sensor

2. Pull cable plug off the knock sensor.
3. Remove fastening screw and knock sensor.

Installing left knock sensor

Installing left knock sensor

CAUTION

Engine damage and changed exhaust behaviour due to incorrectly mounted knock sensors.

-> The precise tightening torque for the knock-sensor screw must be observed, otherwise the proper function of the knock sensor is not ensured.
-> The knock sensors must a aligned so that the sensor housing and the cable plug do not touch anywhere, otherwise proper functioning of the knock sensor is not ensured.

Information

- Clean attachment surfaces of knock sensor on the cylinder block with a cloth.

- The installation position is difficult to reach.

1. Move knock sensor and fastening screw into installation position.
2. Tighten fastening screws to the specified torque. => Tightening torque: 20 Nm (15 ftlb.)
3. Connect cable plug for knock sensor.
4. Fit intake-air distributor. -> 244619 Removing and installing DFI intake-air distributor Overhaul