DTC P2101:00 [MZI-3.7]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P2101:00	Throttle actuator circuit range/performance
DETECTION CONDITION	A PCM malfunction flag is set indicating the motor circuit is open, and may require cycling the key.
POSSIBLE CAUSE	Throttle body connector or terminal malfunction PCM connector or terminal malfunction Throttle actuator circuit are cross-wired PCM malfunction
Courtesy of MAZDA MOTORS CORP.