Knocking is a phenomenon characterized by undesirable
vibration and noise and can cause engine damage. The two Knock Sensor
(KS) are installed inside the V-valley of the cylinder block and senses
engine knocking.
When knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element.
When a knock 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.
Inspection
1.
Check the signal waveform of the CMPS and CKPS using the GDS.
Specification: Refer to “Wave Form”
Removal
•
DON''T remove the camshaft position sensor while the engine
is running or right after engine is turned off.
Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the heater and blower unit.(Refer to HA group – heater unit).
3.
Remove the blower unit (A) from the heater unit after loosening a mounting bolt and 3 screws.
Make sure that there is no air leaking out of the blower and duct joints.