Circuit Description
WARNING: This page is about a different car, the 2000 Isuzu Rodeo and 2000 Isuzu Amigo. However, it is still accessible from the selected car via links, so may be relevant.
When ignition is turned on, battery voltage is supplied to HO2S heater to provide for faster sensor warm-up, allowing sensor to become active in a shorter period of time. PCM reads amount of time necessary for sensor to become active after start-up.
Conditions required to set DTC are:
- No related DTCs set.
- ECT and IAT less than 90°F (32°C) at start-up.
- Difference between ECT and IAT no greater than 9°F (5°C).
- Ignition is 11-16.6 volts.
- Throttle angle is less than 40 percent.
- MAF calculated airflow is less than 18 grams per second.
- HO2S-2 reading remains within .15 volt of bias reading (.4-.5 volt) for longer amount of time than it should.