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Home >> Ford >> 1981 >> Econoline E150, Van Display Extended, 5.0L Eng VIN F, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Engine Control III (EEC III) >> Testing Notes & Cautions >> Oxygen Sensor Test

Oxygen Sensor Test

  1. With engine at operating temperature but stopped, disconnect oxygen sensor connector. Start engine and run on high step of fast idle cam for 1 minute.
  2. Connect voltmeter between ground and sensor, then depress carburetor control vacuum regulator (CVR) rod for 10 seconds. Voltage should be more than 0.5 volts.
  3. Run engine at fast idle for 1 minute with PCV valve disconnected. Measure oxygen sensor voltage. Voltage should be less than 0.5 volts.
  4. If oxygen sensor does not function as described, retest. If voltage readings are still incorrect, replace sensor. Tighten sensor to 27-33 ft. lbs.
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