DTC P0721; Output Shaft Speed Sensor/Sensor Output Range Malfunction: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P0721:00
DETECTION CONDITION	Under the following condition, the output shaft speed is 13, 560 rpm or more in forward or 2, 000 rpm or more in reverse for a continuous 1 s: Battery voltage is 8 V or more.
FAIL-SAFE FUNCTION	Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control. Inhibits AAS.
POSSIBLE CAUSE	Output shaft speed sensor malfunction
SYSTEM WIRING DIAGRAM	Not applicable