Code 13: Open Oxygen Sensor Circuit: Notes
WARNING: This page is about a different car, the 1990 Oldsmobile Cutlass Cruiser, 1990 Oldsmobile Cutlass Ciera, 1990 Oldsmobile Cutlass Calais, 1990 Buick Skylark, and 1990 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- 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.
- This test determines if Code 13 is caused by the sensor or wiring.
- 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.