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Oxygen Sensor

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  1. Disconnect differential pressure regulator connector from side of regulator. Using Adapter (1315 A/1 ), connect Multimeter (US 1119 ) to differential pressure regulator and to the connector removed from the regulator.
  2. Set multimeter to 200Ma DC scale. Disconnect oxygen sensor connector. Start engine and let idle. Note reading on multimeter. Ground male end of oxygen sensor connector.
  3. Observe multimeter. Current should increase from 9Ma to 11Ma after 15 seconds. Reconnect oxygen sensor connector. Raise engine speed to approximately 3000 RPM for a few seconds.
  4. Let engine idle. Current should fluctuate approximately 1-3Ma in the -10Ma to +10Ma range.
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