Code 13: Open Oxygen Sensor Circuit: Notes
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Code 13 will set if engine is at operating temperature, O2 sensor signal voltage is steady between .35-55 volt, throttle angle is greater than 6.5 percent and all conditions are met for about 60 seconds. If the conditions for Code 13 exist, the system will not go into "closed loop".
- This will determine if the sensor or the wiring to the ECM is the cause of Code 13.
- Use only a high impedance (10-megohm) digital volt-ohmmeter during this test. This checks the continuity of circuits No. 412 and No. 413. If circuit No. 413 is open, the ECM voltage on circuit No. 412 will be greater than .6 volt.