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Fault diagnosis 189
Diagnostic trouble codes P0505, P0506, P0507 (contd.)
.
◊
Diagnostic procedure
1 Check for air leakage
- Check whether air leakage occurs, as follows:
- Start the engine and run it at idling speed.
- Constrict the
flow of air through the idle air con-
trol valve by pinching off the air hose using a
pair of pliers.
Idling speed should drop drastically.
Has idling speed dropped?
I
YES
I
Continue with point 2.
I NO
I
Continue fault diagnosis by carrying out the
following checks:
• air leakage (after throttle)
• poorly adjusted throttle
• defective brake servo
• purge valve fastened in open position
Rectify as necessary and then continue with
point 4.
Saab 9000
I
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