Saab 9000 - Page 208

Fault diagnosis 205
Diagnostic trouble code
~1'549
(contd.)
1
P0105 - P0108
Diagnostic procedure
1 Check additional diagnostic trouble codes in
the Trionic system
- Obtain readouts of all diagnostic trouble codes .
using the ISAT scan tool.
•
P0105-
P0108
Are any of the above diagnostic trouble codes
present?
I
YES
I
Continue fault diagnosis as described for
the appropriate diagnostic trouble code.
I
NO
I
Continue with point 2.
2
2 Investigate the cause of the fault
In the following it will be determined whether the fault
is a control fault or a basic engine/turbo fault.
~
Disconnect the air hoses marked 'W" and
"C"
from
the boost pressure control valve and con-
nect them to each other with a length of pipe.
- Drive the car.
- Only basic
boost
pressure
should be obtained
when driving at wide open throttle from low en-
gine rpm and when opening the throttle sudden-
ly at higher engine rpm.
Is only basic boost pressure obtained?
I
YES
I
Continue with point 3.
INO
I
Check and, if necessary, rectify the follo-
wing:
•
Binding wastegate
•
Defective
diaphragm unit
•
Defective
or incorrectly connected control
hoses
•
Incorrectly adjusted basic boost pressure
Rectify as necessary and continue with po-
int 9.
Saab 9000
I