Circuit Description
WARNING: This page is about a different car, the 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Heated oxygen sensors located on each exhaust manifold monitor exhaust gas oxygen content and deliver input signals to ECM. Heated oxygen sensor (bank No. 1 sensor No. 1) is located on driver's side exhaust manifold and heated oxygen sensor (bank No. 2 sensor No. 1) is located on passenger's side exhaust manifold. ECM uses input signal to determine fuel injection system operation. DTC is set when output voltage of heated oxygen sensor remains at .35 volt or more, or .70 volt or less when engine is idling with engine at normal operating temperature. Possible causes are:
- Heated oxygen sensor circuit is open or shorted.
- Defective heated oxygen.
- Air induction system malfunction.
- Improper fuel pressure.
- Defective fuel injector.
- Defective ECM.