Note. For component location, see appropriate illustration in THEORY & OPERATION article.
Circuit Description
Mass Airflow (MAF) meter uses a platinum hot wire maintained at a constant temperature. MAF meter may also be referred to as airflow meter. Airflow past sensor affects temperature and current flow through MAF meter. DTC is set when ECM detects either throttle valve is fully closed and MAF meter output is more than 2.2 volts for more than 10 seconds with engine speed of 900 RPM or less, or VTA circuit signal is .63 volt or more and MAF meter output is less than 1.06 volts for more than 10 seconds with engine speed of 1500 RPM or more. ECM will operate in fail-safe mode if DTC P0101 is set. Possible cause is defective MAF meter.