Page text (OCR transcript)
EG-452
ENGINE – 2JZ-GE ENGINE TROUBLESHOOTING
2 Check knock sensor.
P Disconnect knock sensor connector.
C Measure resistance between the knock sensor terminal and body.
OK Resistance: 1 MΩ or higher
OK
NG Replace knock sensor. (See page EG-245)
3 Check for open and short in harness and connector between engine control module and knock sensor (See page IN-30).
OK
NG Repair or replace harness of connector.
4 Does malfunction disappear when a good knock sensor is installed?
NO
YES Replace knock sensor. (See page EG-245)
Check and replace engine control module.
Reference INSPECTION USING OSCILLOSCOPE
KNK Signal Waveform
0.5 V/Div.
0 V
5 msec./Division
• With the engine racing (4,000 rpm) measure wave-form between terminals KNK1, KNK2 of engine control module and body ground.
HINT: The correct waveform is as shown.
0.5 V/Div.
0 V
100 Ωsec./Division
• Spread the time on the horizontal axis, and confirm that the period of the wave is 123 Ωsec.
(Normal mode vibration frequency of knock sensor: 8.1 KHz).
HINT: If normal mode vibration frequency is not 8.1 KHz, the sensor is malfunctioning.
FI6830
FI6510
FI6642
