Knocking is a phenomenon characterized by undesirable
vibration and noise that can cause engine damage. Two Knock Sensors (KS)
are installed inside the V-valley of the cylinder block to sense engine
knocking.
When knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element.
When a knocking occurs, the sensor produces voltage signal.
The ECM retards the ignition timing when knocking occurs. If the
knocking disappears after retarding the ignition timing, the ECM will
advance the ignition timing. This sequential control can improve engine
power, torque and fuel economy.
Engine Room Under Cover Repair procedures
Removal
Engine Room Front Under Cover
1.
Remove the engine room front under cover (A).
Tightening torque :
7.8 ~ 11.8 N.m (0.8 ~ 1.2 kgf.m, 5.8 ~ 8.7 lb-ft)
2.
Install in the reverse or ...
Non-operational conditions of parking assist system
Parking assist system may not operate normally when :
1. Moisture is frozen to the sensor. (It will operate normally when moisture
melts.)
2. Sensor is covered with foreign matter, such as snow or ...