Circuit Description
WARNING: This page is about a different car, the 2003 Lexus SC 430. 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. See Fig 1-Fig 2 . DTC P0100 is set when ECM detects an open or short circuit for 3 seconds, with engine speed around 4000 RPM. Possible causes are:
- Open or short in MAF circuit.
- Faulty MAF sensor.
- Faulty ECM.