Diagnostic Aids

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.

Normal mode vibration frequency of knock sensor is 7.1 kHz. If oscilloscope is available, knock sensor No. 1 operation may be checked by reading knock sensor waveform patterns with engine at 4000 RPM. Knock sensor waveform patterns may be checked by connecting oscilloscope between body ground and terminal No. 27 (White wire) at ECM electrical connector E4. This is the KNKR terminal on ECM. ECM is located behind glove box, near passenger's side kick panel. See Figure. For ECM electrical connector terminal identification, see Figure. Knock sensor waveform patterns should be properly displayed. See Figure.