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A00406
KNK signal waveform
0.5V/
Division
0V
0V
5 m sec./Division
100 sec./Division
0.5V/
Division
–DIAGNOSTICS ENGINE
DI–73
2000 CELICA (RM744U)
4 Does malfunction disappear when a good knock sensor 1 is installed?
YES Replace knock sensor 1.
NO
Check and replace ECM (See page IN–30).
Reference: INSPECTION USING OSCILLOSCOPE
S With the engine racing (4,000 rpm) measure between ter-
minal KNK of the ECM connector and body ground.
HINT:
The correct waveforms are as shown.
S Spread the time on the horizontal axis, and confirm that
period of the wave is 80 µ sec.
(Normal mode vibration frequency of knock sensor:
12.5 kHz (1ZZ–FE), 7.1 kHz (2ZZ–GE))
HINT:
If normal mode vibration frequency is not 7.6 kHz the sensor is
malfunctioning.