Knock Sensor: Service and Repair

Knock Sensor

Removing







• The forward sensor (1) is known to the powertrain control module (PCM) as knock sensor 1. The rear sensor (3) is known to the PCM as knock sensor 2.

- Perform the fuel pressure release procedure. Refer to => [ Fuel System Pressure Release Procedure ] Service and Repair.

- Disconnect the negative battery.

- Drain the cooling system. Refer to => [ Cooling System Draining and Filling ] Cooling System Draining and Filling.

- Remove the air cleaner housing assembly, upper and lower intake manifolds and the oil filter housing. Refer to => [ Lower Intake Manifold ] Lower Intake Manifold.

- Remove the electrical connector (4).

• There may be a foam strip on the bolt threads. This foam is used only to retain the bolts to the sensors for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to these bolts.

- Remove the mounting bolt (2) and knock sensor 1 (1) or knock sensor 2 (3).

Installing

• The forward sensor (1) is known to the powertrain control module (PCM) as knock sensor 1. The rear sensor (3) is known to the PCM as knock sensor 2.

- Thoroughly clean the knock sensor mounting holes.






• Over or under tightening the sensor mounting bolts will affect knock sensor performance, possibly causing improper spark control. Always use the specified torque when installing the knock sensors. The torque specification for the knock sensor bolt is less than the typical 8 mm bolt.

• There may be a foam strip on the bolt threads. This foam is used only to retain the bolts to the sensors for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to these bolts.

- Install knock sensor 1 (1) or knock sensor 2 (3) with mounting bolt (2). Tighten the mounting bolt to 22 Nm (16 ft. lbs.).

- Connect the electrical connector (4).

- Install the oil filter housing, upper and lower intake manifolds and air cleaner housing assembly. Refer to => [ Upper Intake Manifold ] Upper Intake Manifold.

- If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to => [ Oil Filter ] Service and Repair.

- Connect the negative battery cable.

- Fill the cooling system. Refer to => [ Cooling System Draining and Filling ] Cooling System Draining and Filling.

- Operate the engine until it reaches normal operating temperature. Check cooling system for correct fluid level.