EG–563 ENGINE – 2JZ–GTE ENGINE TROUBLESHOOTING 2 Check knock sensor. P Disconnect knock sensor connector. C Measure resistance between the knock sensor terminal and body. OK Resistance: 1 M or higher OK NG Replace knock sensor (See page EG–316) 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 or connector. 4 Does malfunction disappear when a good knock sensor is installed? NO YES Replace knock sensor. (See page EG–316) 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 waveform between terminals KNK1, KNK2 of engine cotrol module and body ground. HINT: The correct waveform is as shown. 0.5 V/Div. 0 V 100 μ sec./Division • Spread the time on the horizontal axis, and confirm that the period of the wave is 123 Ω sec. (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. FI6510 FI6642