Knock Sensor: Service and Repair

KNOCK SENSOR

Removal Procedure

1. Drain cooling system.
2. Remove the upper intake manifold.
3. Remove the lower intake manifold.
4. Remove the front bolt from the bracket that secures the upper coolant pipe.
5. Remove the bypass hose from the upper coolant pipe.
6. Remove the upper radiator hose.
7. Disconnect the electrical connector from the bracket.
8. Remove the rear bolt from the bracket that secures the upper coolant pipe.
9. Remove the coolant pipe.
10. Disconnect the electrical connector from the knock sensor.
11. Unscrew the knock sensor from the engine block.

Installation Procedure

Notice: Do not apply thread sealant to the sensor threads. The sensor is coated at the factory and applying additional sealant will affect the sensor's ability to detect detonation.

1. Screw the knock sensor into the engine block.

Tighten:
Tighten the knock sensor to 7 Nm (62 lb in).

2. Connect the electrical connector to the knock sensor.
3. Install the upper coolant pipe.
^ Lubricate the O-ring seal on the end of the coolant pipe with fresh engine coolant.
4. Install the rear bolt that secures the upper coolant pipe.

Tighten:
Tighten the rear bolt to 16 Nm (12 lb ft).

5. Connect the electrical connector to the bracket.
6. Install the radiator hose.
7. Install the bypass hose on the upper coolant pipe.
^ Fill the upper radiator hose with coolant before installing the intake manifolds, to ensure that the O-ring seal does not leak.
8. Install the front bolt to the bracket that secures the upper coolant pipe.
9. Install the upper intake manifold. Refer to Upper Intake Manifold.
10. Install the lower intake manifold, Refer to Lower Intake Manifold.
11. Fill the cooling system. Refer to Draining and Filling the Cooling System in Engine Cooling.