Saab 9000 - Page 231

228 Fault diagnosis
Dips in idling speed and engine rpm (contd.)
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3 Check operation of the control valve
- Disconnect the valve's air hoses.
- Remove the idle air control valve.
- Plug in the idle air control valve's electrical con-
nector.
- Connect an ISAT scan tool.
- Ignition switch in ON position.
- Select "ACTIVATE".
- Select "IAC VALVE"
- Check visually that the valve rotates without
tending to bind.
Is the control valve OK?
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YES
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Continue with point 4.
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NO
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Change the idle air control valve and then
continue with point 6.
4
---A
10
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10
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0
4 Check the idle air control valve switch and/or
connector
- Carry out a visual check of the control valve's
switch and connec,or. If necessary, clean and
grease the switch and/or connector.
- Check whether engine revs continue to dip.
Does the engine still dip?
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YES
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Continue with point 5.
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NO
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Continue with point 6.
Saab 9000
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