Possible Causes
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.
DTC is set when ECM detects an open or short in mass air flow meter circuit for more than 3 seconds at an engine speed of 4000 RPM or less. If DTC P0100 exists, ECM will operate in fail-safe mode in which ignition timing is fixed at 5 degrees BTDC. Possible causes are:
- MAF meter circuit is open or shorted.
- Defective MAF meter.
- Defective ECM.