Possible Cause
WARNING: This page is about a different car, the 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
This DTC uses two-trip detection logic. DTC is set when ECM detects MAF meter output is greater than 2.2 volts with engine coolant temperature of 158°F (70°C) and throttle valve closed with engine speed of 900 RPM or less for more than 10 seconds, or when MAF meter output is less than 1.06 volts Throttle Position (TP) sensor VTA circuit signal voltage is 0.63 volt or more with engine speed of 1500 RPM or more for more than 10 seconds. Possible cause is defective MAF meter.