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Home >> Chevrolet >> 1990 >> Beretta Base, 2.2 G, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.3L 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. The following conditions must exist to set a Code 13:
    • Engine running at least 40 seconds after start.
    • Engine coolant temperature greater than 108.5°F (42.5°C).
    • Code 21 or 22 must not be set.
    • Oxygen sensor voltage steady between .34 and .55 volt.
    • TPS signal greater than 6 percent for more time than less than 6% or about .3 volt greater than closed throttle voltage.
    • Conditions must be met and held for at least 20 seconds.
  2. This test will indicate whether sensor is faulty, or if wiring and/or ECM is cause of Code 13.
    NOTE: Use only high impedance digital volt/ohmmeter for this test.
  3. This test checks for continuity of circuits No. 412 and 413. If circuit No. 413 is open, ECM voltage on circuit No. 412 will be greater than .6 volt (600mV).
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