DTC P0722: Output Speed Sensor Circuit No Signal: Reference
WARNING: This page is about a different car, the 2004 Suzuki Vitara. However, it is still accessible from the selected car via links, so may be relevant.
Connect oscilloscope between "C51-1-23" (+) and "C51-1-22" (-) for J20 engine model ("C51-1-10" (+) and "C51-1-9" (-) for H25 engine model) of PCM connector connected to PCM and check output speed sensor signal.