DTC P2112:00 [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 P2112:00	Throttle actuator control system - stuck closed
DETECTION CONDITION	This PCM fault status indicates the throttle plate is at a lower angle than commanded.
POSSIBLE CAUSE	Binding throttle body, stuck close Open circuit in throttle actuator Open circuit between throttle body terminal A and PCM terminal 2BO Open circuit between throttle body terminal B and PCM terminal 2BR Short to ground between throttle body terminal A and PCM terminal 2BO Short to ground between throttle body terminal B and PCM terminal 2BR Short to TP sensor power supply between throttle body terminal A and PCM terminal 2BO Short to TP sensor power supply between throttle body terminal B and PCM terminal 2BR Throttle actuator control circuits are shorted each other Throttle actuator control circuits are cross-wired TP sensor related circuit malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.