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