Toyota 1 MZ–FE Manual page 502

EG2–502
Check for open and short in harness and connector between EE1
connector and knock sensor (See page IN–31).
HINT: If DTC P0325 has changed to P0330, check the knock sensor circuit on the right bank side.
If DTC P0330 has changed to P0325, check the knock sensor circuit on the left bank side.
Replace knock sensor.
Reference
INSPECTION USING OSCILLOSCOPE
1MZ–FE ENGINE – CIRCUIT INSPECTION
Repair or replace harness or connector.
With the engine racing (4,000 rpm) measure be–
tween terminals KNKR, KNKL of ECM and body
ground.
HINT: The correct waveform appears as shown i n the
illustration on the left.
Spread the time on the horizontal axis, and confirm
that period of the wave is 141 µ sec.
(Normal mode vibration frequency of knock sen–
sor: 7.1 KHz).
HINT: If normal mode vibration frequency is not 7.1
KHz, the sensor is malfunctioning.