Saab 9000 Service Manual page 222

Poor driveability (contd.)
2~
2 Check pressure sensor operation
Driveability problems may arise if the pressure sen-
sor does not provide the correct voltage across the
entire pressure range.
- Check pressure sensor operation.
- Turn the ignition switch to the ON position and
then back to the OFF position.
- Select "READ FUNCTIONS".
- Select "INTAKE PRESSURE".
The ISAT scan tool should show a reading of about
102 kPa (NOTE: the reading is dependent on · air
pressure).
- Fi.rst build up a positive pressure of 0.6 bar and
then create a negative pressure of - 0.6 bar.
Use a pressure gauge and pressure/vacuum
pump.
The ISAT scan tool should show readings of 160 ±
5 kPa and 40
±
5 kPa respectively (the ISAT scan
tool readings may be somewhat lower at high alti-
tudes).
If any reading is not OK, change the pressure sensor.
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Fault diagnosis 219
102 kPa
+0.6 bar
160±0.5 kPa
-0.6 bar
40±0.5 kPa
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