Circuit Description

MAF sensor uses a platinum hot wire maintained at a constant temperature. Airflow past sensor affects temperature and current flow through sensor. ECM will operate in fail-safe mode if DTC P0101 is set. DTC P0101 is set when throttle valve is fully closed, MAF sensor output is more than 2.2 volts, and engine is at operating temperature for 10 seconds or more at engine speed of 900 RPM or less.

DTC P0101 will also set when Throttle Position (TP) sensor output is .63 volt or more, and MAF sensor output is less than one volt for 6 seconds or more at engine speed of 1500 or more. Possible cause is:

• MAF sensor.