Code 13: Open Oxygen Sensor Circuit: Notes
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Code 13 will set when the following conditions occur:
- Engine at normal operating on temperature.
- At least 2 minutes elapsed since start-up.
- Oxygen signal voltage steady between .35 and .55 volt.
- Throttle angle greater than 3-6 percent (about .3 volt greater than closed throttle voltage).
- All conditions must be met for about 60 seconds.
If conditions for a Code 13 exist, the system will not go "closed loop".
- This test will determine if the sensor, wiring or ECM is the cause of Code 13.
- When conducting this test, use only a high impedence (10 megohm) digital volt/ohmmeter. This test checks 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.