Possible Causes
WARNING: This page is about a different car, the 2003 Toyota MR2. 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 throttle valve closed with engine speed of 900 RPM or less, or MAF meter output is less than 1.06 volts with Throttle Position (TP) sensor VTA circuit signal voltage of 0.63 volt or more with engine speed of 1500 RPM or more. Possible cause is defective MAF meter.