Circuit Description

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 (ignition timing fixed at 5 degrees BTDC). 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.