Saab 9000 - Page 201

198 Fault diagnosis
Diagnostic trouble
codes ,P1170
P1171,
P1172 (contd.)
3~
3 Check pressure sensor operation
- Tum the ignition switch to the ON position and
then back to the OFF position.
- Connect an ISAT scan tool.
- 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).
First build up a pressure of 0.6 bar and then create
a vacuum of - 0.6 bar. Use a pressure gauge and a
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).
This test is intended to detect any shift in the operat-
ing range of the pressure sensor.
Are the readings OK?
I
YES
I
Continue with point
4.
I
NO
I
Change the pressure sensor and continue
with point 6.
Saab9000
I~~
0000
0000
0000
0000
OOc::::::J
+0.6 bar
[C3l
160±0.5
kPa
0000
0000
0000 •
0000
0 0
c::::J
-0.6 bar
[~~
0000
0000
0000
0000
0 0
c::::J