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 on driver's side exhaust manifold may be referred to as bank No. 1 sensor No. 1 and heated oxygen sensor on passenger's side exhaust manifold may be referred to as bank No. 2 sensor No. 1. ECM uses input signal to determine fuel injection system operation. DTC is set when ECM detects a response time of 1.1 seconds or more for heated oxygen sensor to change from rich to lean or from lean to rich with engine idling and at normal operating temperature. Possible causes are:
- Heated oxygen sensor circuit is open or shorted.
- Defective heated oxygen sensor.
- Air induction system malfunction.
- Improper fuel pressure.
- Defective fuel injector.
- Defective ECM.