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Home >> Oldsmobile >> 1990 >> Cutlass Cruiser SL, 125C/MD9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.3L PFI >> Diagnostic Tests >> Code 13: Open Oxygen Sensor Circuit >> Notes

Code 13: Open Oxygen Sensor Circuit: Notes

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Code 13 will set if the following conditions occur:
    • Engine is at operating temperature.
    • No Code 21 or 22 is set.
    • At least 40 seconds engine running time after start.
    • Oxygen signal steady between .30 and .55 volt.
    • Throttle position sensor signal greater than idle.
    • All conditions must be met for 30 seconds.

    If all conditions for a Code 13 exist, system will not go into closed loop.

  2. This test determines if Code 13 is caused by the sensor or wiring.
  3. When performing this test, use only a high impedance (10-megohm) digital volt-ohmmeter. This tests the continuity of circuits No. 412 and 413. If circuit No. 413 is open, the ECM voltage on circuit No. 412 will be greater than .6 volt.
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