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This same circuit board is in the Hiace van too. I, like you could find nothing regarding the XRZ6731A chip.
I did manage a complete re-solder of the SMD connections which then allowed me to test with a function generator.
The Toyota have a three pulse per revolution so the expected revolution indication can be calculated depending on the square wave frequency injection on the pulse input.EG. Generator frequency of 50 Hz divided by 3, multiplied by 60 seconds should indicate 1000RPM. (300/3 then multiplied by 60 = 6000RPM).
At least you can check for correct operation before going through the hurt of re-installing it.
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