just did a check.using the signal wire pin 17 and earth and am getting 0.68 volts at throttle close rising to 4.85 volts at full throttle so it appears to be out of tolerance in the same direction .but i see what you are saying frog as i had this delema when setting it up first using ohms as a guide as the sensor and throttle body were on the bench.i,m sure your set up is correct but it depends were you take the readings, i will re set it in the next day or so and see what happens and will post the results and procedure i used here
wish me luck