G 20 Van V6-262 4.3L VIN Z (1993)
Knock Sensor: Description and Operation
With 4L60E Automatic Transmission
PURPOSE:
The Knock Sensor (KS) is used to detect engine detonation (ping). The control module will retard the electronic spark timing up to 8° based on the
signal received.
CONSTRUCTION
The KS system has two major components:
-
Control Module.
-
Knock Sensor(s). The two knock sensors are spliced together and go directly to the control module.
OPERATION
The knock sensor internal circuit causes the control modules 5 volts to be pulled down to about 2.5 volts. The knock sensor produces an A/C signal
which rides on the 2.5 volts DC signal. The AC voltage monitor in the control module will detect this AC voltage and provide a signal to begin
retarding spark until the knock diminishes. The amplitude and frequency are dependent upon the knock level.
LOCATION
Engine block.
