Toyota ZZT230 series Repair Manual page 284

4 Does malfunction disappear when a good knock sensor 1 Is Installed?
Check and replace ECM
O.SV/
J.1
A85TO
"""
sec./ ivision
100
DIAGNOSTICS
(Sae page IN-30).
•
Referenca:
With the engine racing
minal KNK of the ECM connector and body ground.
HINT:
The correct waveforms are as sh
Spread the time
•
period of the wave is
(Normal mode vibration frequency of knock sensor:
12.5 kHz (1ZZ-FE).
HINT:
If normal mode vibration frequency is not
malfunctioning.
ENGINE
s
Replace knock se o
n r
INSPECTION USING OSCILLOSCOPE
(4,000
rpm) measure between ter­
o wn
ll
on the horizontal axis, and confirm that
80
sec.
kHz (2ZZ-GE))
7.1
01-73
1.
.
kHz the sensor is
7.6