General information
The knock sensor is a piezoelectric crystal. The knock sensor is installed on the wall of the cylinder block to determine the detonation combustion of fuel in the engine cylinders. The vibration of the cylinder block caused by detonation is converted into a signal (voltage), proportional to its intensity. If detonation has occurred in the engine, then the electronic engine control unit, using this signal, reduces the ignition timing until it disappears.
Engines 2.0 l / 2.4 l. | Engine 2.7 l. |
Troubleshooting Guide
The MIL is on or the tester sets the appropriate DTC in the following condition.
1. If the knock sensor signal is not detected even when the engine is running under overload conditions.
2. If the knock sensor signal level is abnormally low.
Sensor test
1. Disconnect the knock sensor connector and measure the resistance between the terminals "2" And "3" connector for 2.7L engine or between terminals "1" And "2" connector for engines 2.0 l / 2.4 l.
- Rated value (at 20°C): approx. 5 MΩ
Engine 2.7 l.
2. If the resistance is zero (circuit is closed), replace the knock sensor.
- Tightening torque: 16-28 Nm
3. Measure the electrical capacitance of the sensor between the terminals "2" And "3" connector for 2.7L engine or between pins "1" And "2" connector for engines 2.0 l / 2.4 l.
- Rated value: 800-1600pF