Contents: Examination ↓ Replacement ↓
The knock sensor is designed to register knocking in the cylinders and reduce the ignition timing. On 4-cylinder engines, the sensor is screwed into the cylinder block under the head; on 6-cylinder engines, there are 2 sensors that are screwed under the intake manifold.
Examination
1. The circuit between the sensor output and its body must not be short-circuited. Otherwise, replace the sensor.
Replacement
1. Disconnect the battery from ground.
2. When the engine is cold, drain 3–4 liters of fluid.
3. On 6-cylinder engines, remove the intake manifold (see subsection 3.2.5.).
4. Disconnect the connector and remove the sensor. On 6-cylinder engines, the knock sensor is mounted under the intake manifold.
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5. Tighten the new sensor to 36 Nm (the sealant on the threads of the new sensor is applied by the manufacturer).