Oscilloscope Patterns and Waveforms

INSPECTION USING OSCILLOSCOPE




- With the engine racing (4,000 rpm) measure wave form between terminals OX1 and E1 of Engine Control Module.

- The correct waveform appears as shown in the illustration, oscillating between approximately 0.1 volts and 0.9 volts.

- If the oxygen sensor is deteriorated, the amplitude of the voltage is reduced as shown on the left.