The easiest way of checking the phase sensor is first thing in the morning, does the fuel pump prime, if the sensor is duff it won't, if the pump does prime the sensor is ok, it's only used on starting anyway.
The map sensor can be checked by measuring the output, on the signal wire, this will be the only one that varies with vacuum/pressure, the other being earth and also the refference feed of 5V.
tabetha