Reference INSPECTION USING OSCILLOSCOPE Ox Signal Waveform 1 V 0 V 200 msec./Division • With the engine racing (4,000 rpm) measure waveform between terminals OX1 and E1 of engine control module. HINT: The correct waveform is as shown oscillating between approx. 0.1 V and 0.9 V 1 V 0 V 200 msec./Division If the oxygen sensor has deteriorated, the amplitude of the voltage will be reduced as shown on the left. FI8514 FI8515