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 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 determines if the sensor, wiring or ECM is the cause of Code 13.
- When conducting this test, use only a high impedance (10-megohm) digital volt-ohmmeter. This tests the continuity of the sensor signal and ground circuits. If ground circuit is open, the ECM voltage on the signal circuit will be greater than .6 volt.