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Home >> Toyota >> 1990 >> Camry Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - EFI >> Sub-Oxygen Sensor Test
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Sub-Oxygen Sensor Test

  1. Inspection is required when trouble code No. 27 exists. Clear trouble codes. See CLEARING TROUBLE CODES in TESTS W/CODES - EFI article. Warm engine to normal operating temperature.
    CAUTION: DO NOT exceed 62 MPH or trouble code will be canceled.
  2. On all models, drive vehicle between 50 and 61 MPH for at least 5 minutes in 4th or 5th gear (M/T) or "D" range (A/T).
  3. On all models, fully depress accelerator pedal for at least 10 seconds with engine RPM at least 3000 RPM.
  4. Stop engine and turn ignition off. Repeat previous steps and note if trouble code No. 27 exists again. If trouble code exists again, check sub-oxygen sensor circuit for continuity, shorts or grounds. Replace sub-oxygen sensor if circuit is okay.
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