Circuit Description
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
MAF sensor uses a platinum hot wire maintained at a constant temperature. Airflow past sensor affects temperature and current flow through sensor. If DTC P0100 is set, ECM will operate in fail-safe mode, keeping ignition timing and injection volume constant. DTC P0100 is set when ECM detects a open or short circuit with engine speed at 4000 RPM or less for more than 3 seconds. Possible causes are:
- Open or short in MAF circuit.
- Faulty MAF sensor.
- Faulty ECM.