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Toyota Workshop Service and Repair Manuals

Throttle Position Sensor > < Component Tests and General Diagnostics|Page 685
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Oxygen Sensor: Oscilloscope Patterns and Waveforms

INSPECTION USING OSCILLOSCOPE

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

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

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

Throttle Position Sensor > < Component Tests and General Diagnostics|Page 685