DTC P0101: Mass or Volume Air Flow Circuit Range/Performance Problem: Wiring Diagram
WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
Refer to WIRING DIAGRAM under DTC P0100: MASS OR VOLUME AIR FLOW CIRCUIT MALFUNCTION, DTC P0102: MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT, DTC P0103: MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT.