Does polarity matter for the anti-lock braking system wheel speed sensor on a Mazda RX-7 FD?

Likely yes, though there's no FD-specific data to confirm it directly. On the closely related FC3S (S4 and S5) RX-7, the ABS wheel speed sensors are magnetic reluctor passive sensors set up for a magnetic falling edge trigger, with specific positive (+) and negative (-) wiring polarities defined for each wheel ¹; because magnetic reluctor sensors rely on polarity to generate the correct waveform, wiring them backward typically results in an inverted signal that the ABS computer or ECU cannot read properly. It is highly likely the FD uses a similar reluctor-style sensor where polarity would matter the same way, but specific sensor data or wiring diagrams for the FD chassis were not available to verify this directly.