FUEL SYSTEM <DOHC>
On-Vehicle Inspection of
Components
KNOCK SENSOR <Turbo, Non-Turbo From 1992 models>
Engine control module
Component side
connector
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I
s e n s o r
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I
Harness side
connector
OPERATION
The knock sensor converts cylinder block vibrations
due to knocking into voltage according to the
strength of the vibrations and inputs it to the engine
TROUBLESHOOTING HINTS
When knocking occurs when driving at maximum
load, the following troubles, other than the knock
control module.
The engine control module controls the delay in
spark timing according to this signal.
sensor, can be inferred.
(1) Incorrect spark plug heat rating
(2) Incorrect gasoline
of standard spark timing
Normal waveform
INSPECTION
Using Oscilloscope
(1) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram.
(2) Rev up the engine to 5,000 rpm, and check the waveform.
TSB Revision
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