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:
Engine number
The engine number is stamped on the engine block as shown in the drawing. ...
Parking brake
Checking the parking brake
Check the stroke of the parking brake by counting the number of “clicks’’ heard
while fully applying it from the released position. Also, the parking brake alone ...
General Information
The Micro 570 Analyzer (Canada only)
The Micro 570 Analyzer provides the ability to test the charging and starting
systems, including the battery, starter and alternator.
...