Knock Sensor: Service and Repair

Removing And Installing Knock Sensor

Technical values







Preliminary work

DANGER:
Vehicle can fall down
- Risk of squashing or crushing
- Risk of damage to the vehicle

- Do not place any solid objects under the raised vehicle.
- Ensure that the lifting platform is prevented from lowering.
- Remove solid objects before lowering the vehicle.
- Raise the vehicle only at the take-up points provided.

1. Raise the vehicle.
2. Place protective covers on the vehicle to avoid damaging the body and passenger compartment.
3. Remove air cleaner housing.

Removing knock sensor

Removing knock sensor for cylinder bank 1-3
1. Disconnect the battery.
2. Remove the generator.







3. Pull off tank vent line.
3.1. Unclip line at the resonance tube -arrow- and feed line for the carbon canister -1- and set them aside.
3.2. Pull tank vent out of the bracket -2- .

INFORMATION: Before removing the knock sensor, mark the installation position using a water-resistant marker.







4. Remove knock sensor for cylinder bank 1-3 .
4.1. Release and pull off cable plug -3- .
4.2. Unscrew external Torx screw (M8 x 35) -4- for the knock sensor and remove the knock sensor.

Removing knock sensor for cylinder bank 4-6
1. Remove resonance tube.
2. Remove intake-air distributor pipe on cylinder bank 4-6.







3. Remove holder for fuel high-pressure connecting line.
3.1. Unscrew external Torx screw (M6 x 16) -3- on the holder.
3.2. Loosen external Torx screw M6 x 12 -2- on the holding clamp.
3.3. Slide holder -1- to one side.

INFORMATION: Before removing the knock sensor, mark the installation position using a water-resistant marker.







4. Remove knock sensor for cylinder bank 4-6 .
4.1. Release and pull off cable plug -2- on the knock sensor.
4.2. Unscrew external Torx screw (M8 x 35) -3- on the knock sensor.
3.3. Remove knock sensor -1- .

Installing knock sensor

Installing knock sensor for cylinder bank 1-3







1. Install knock sensor for cylinder bank 1-3.
1.1. Clean sealing surface of knock sensor with a cloth.
1.2. Screw in and tighten external Torx screw (M8 x 35) -4- on the knock sensor.
The precise tightening torque for the knock-sensor screw must be observed, otherwise the knock sensor might not function properly. - Tightening torque: 23 Nm (17 ftlb.)
1.3. Connect and lock cable plug -3- .







2. Install tank vent line.
2.1. Insert tank vent into the holder -2- and press firmly.
2.2. Clip in line at the resonance tube -arrow- and the feed line for the carbon canister -1- .
The plug-in couplings must lock with an audible click.

3. Connect the battery.
4. Install the generator.

Installing knock sensor for cylinder bank 4-6







1. Install knock sensor for cylinder bank 4-6.
1.1. Clean contact surface of knock sensor with a cloth.
1.2. Fit knock sensor -1- .
1.3. Screw in and tighten external Torx screw (M8 x 35) -3- on the knock sensor.
The precise tightening torque for the knock-sensor screw must be observed, otherwise the knock sensor might not function properly. - Tightening torque: 23 Nm (17 ftlb.)
1.4. Push on cable plug -2- .







2. Install holder for fuel high-pressure connecting line.
2.1. Slide holder -1- and holding clamp into installation position.
2.2. Tighten external Torx screw M6 x 12 -2- on the holding clamp. - Tightening torque: 10 Nm (7.5 ftlb.)
2.3. Screw in and tighten external Torx screw (M6 x 16) -3- on the holder. - Tightening torque: 10 Nm (7.5 ftlb.)

3. Install resonance tube.
4. Install intake-air distributor pipe on cylinder bank 4-6.

Subsequent work
1. Install air cleaner housing.