Saab 9000 - Page 239

236 Fault diagnosis
Low boost pressure (contd.)
3±10
6 Check the resistance of the valve
- Take resistance readings in the valve's connec-
tor across:
• Pins 1 and 2
• Pins 2 and 3
Nominal resistance is 3
±
1 ohm in both cases.
Are the readings OK?
I
YES
I
Continue with point 7.
I
NO
I
Change the boost pressure control valve.
Important
If there is a short circuit in any winding the control
module will probably also be damaged. If a new val-
ve is then fitted, it will inevitably be rendered unser-
viceable. In the event of a short circuit, both valve
and control module must therefore be changed at
the same time.
If necessary, change fuse 5 afterwards.
7
Check the lead connected to pin 3 of the valve
- Ignition switch in ON position.
- Plug in the valve's connector. A weak buzzing
sound should be heard.
Can a sound be heard?
I
YES
I
Continue with point 8.
I
NO
I
Check the lead between pin 3 of the valve's
connector and pin 2 of the control module ..
Repair
or replace the lead if necessary.
Saab 9000