IIRC the correct distributor for the VX (d15Z1) is the same as the Si (d16Z6) and should read TDU-42 on the base of it. It is possible that the A00 ECU has a bad circuit for reading the CYP sensor.
Also check for any bent pins or corrsion on the A00 ECU. Take off the screws on the cover of the ECU and look at the board for any burnt components as well.
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