Knock Sensor - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

DI02-30

Knock Sensor

Two knock sensors are located on the cylinder block (intake manifold side).
To detect engine vibration under abnormal combustion, knock sensor has piezoelectric element fixed on the
vibration plate and this vibration plate is fixed on the base. If happens knocking, pistons or connecting rods
vibrate and occurs heavy sounds that hit metal. Knock sensor is used to detect those knockings caused by
abnormal combustions. It controls idling stabilities and turns on the engine warning light when detects injector
damages. And also controls pilot injection very precisely during MAP learning.
When knock sensor is defective, engine ECU corrects injection timing based on MAP values like engine speed,
intake air volume and coolant temperature.
Before checking the knock sensor unit, be sure to check the tightening torque of the sensor and connector
connecting conditions.
Insulating resistance
Resonance frequency
Operating temperature
Output voltage
Tightening torque
<Location of knock sensor>
1. Sensor housing
2. Nut
3. Disc spring
4. Weight
5. Insulation disc
6. Upper contact plate
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Min. 1MΩ
25 kHz
- 40 ~ 150°C
26 ± 8 mV/g (at 5 kHz)
22 ~ 37 mV/g (3 ~ 10 kHz)
22 ~ 57 mV/g (10 ~ 20 kHz)
20 ± 5 Nm
7. Piezo element
8. Lower contact plate
9. Body
10. Terminal
11. Resister
Y220_02092
ENGINE HOUSING
DI ENG SM - 2004.4