Saab 9000 - Page 236

Low boost pressure (contd.)
1
Diagnostic procedure
1 Investigate the cause of basic boost pressure
If the control module initiates basic boost pressure
for any reason, there may be many reasons for this.
- Select "READ FUNCTIONS".
- Select "BASIC CHARGE PRESS.
When the car is driven at wide open throttle the ISAT
scan tool will show the cause of the fault.
Does the ISAT scan tool shown "BOOST
PRESSURE"?
I YES I Continue with point 2.
INO I The ISATscan tool shows "KNOCK CONT-
ROL" as the cause of the fault.
The trouble may be due to an inferior grade
of petrol or a defective ignition discharge
module. See "Fault diagnosis, poor perfor-
mance" on page 222.
Saab 9000
©
Fault diagnosis 233
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