Code 13 - Heated Oxygen Sensor Circuit
NOTE:
See appropriate wiring diagram in L - WIRING DIAGRAM
article for terminal and connector identification.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This step checks AIR system operation:
- Idle engine at normal operating temperature.
- Stop engine.
- Disconnect AIR hose at check valve and plug check valve.
- Restart engine and idle, immediately check direction of airflow.
- This step tests continuity of oxygen sensor circuit (Red wire) between ECM 22-pin connector terminal No. 20 and oxygen sensor.