Description
Knocking is a phenomenon characterized by undesirable vibration and noise
and can cause engine damage. Knock Sensor (KS) is installed on 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”
...
Specification
Item
Specification
Capacitance (pF)
950 ~ 1,350
Resistance (MΩ)
4.87
...
See also:
How to say numbers
Voice recognition requires a certain way to say numbers in voice commands. Refer
to the following examples. (General rule: Either "zero" or "oh" can be used for
"0".) ...
Schematic Diagrams
Circuit Diagram (1)
Circuit Diagram (2)
SRSCM Connector terminal
Pin
Function (Connector A)
Pin
Function (Connector B)
...
General Information
General
The supplemental restraint system (SRS) is designed to supplement the
seat belt to help reduce the risk or severity of injury to the driver and passenger
by activating and deploying ...