Opel 1991 Astra Workshop Manual page 1067

11.2.5 CO potentiometer supply voltage: The voltage
between
terminal 23B and signal ground should be between 4.7 and
5.2 volt.
11.2.6 MAP sensor supply voltage: The voltage between
terminal
24B and signal ground should be between 4.7 and 5.2 volt.
11.2.7 MAP sensor signal voltage: The voltage between
terminal
15B and signal ground with ignition on should be:
MAP signal voltage
_____________________________________________________
___
1.00
2.00
3.00
4.00
4.50
5.00
A general tolerance of +/- 5% exists on the above voltages.
Manifold absolute pressure
20 kPa
40 kPa
60 kPa
80 kPa
90 kPa
100 kPa