Saab 9000 - Page 147

144 . Fault diagnosis
Diagnostic trouble code P0300 (contd.)
5
[I
l l
0000
DODO
ODDO
DODO
□
Dc=J
5 Check the operation of the ignition discharge
module
- Fit test spark plugs (part No. 86 11 386) in the
ignition discharge module.
- Ground the spark plugs using test cable 86 10
867.
- Activate each separate ignition coil, using the
ISAT scan tool.
- Ignition switch in ON position.
- Select "ACTIVATE".
-:
Select
"IGNITION COILS"
- Select"IGNITION CYL
1",
"CYL2",
"CYL3"
and
"CYL 4".
Activation of an ignition coil takes place for 1 O se-
conds at 200 Hz. If a longer activation time is re-
quired, the command must be repeated.
- Check that each activated spark plug produces
a spark.
Is a spark produced?
I
YES
I
Continue with point 6.
I
NO
I
Change the ignition discharge module and
proceed to point 8.
&
WAR~ING
The electronic ignition system generates up to
40,000 Volts. · Such voltages can prove fatal to
people with weak hearts or those who are fitted
with a pacemaker. All due caution should therefo-
re be observed when carrying out any work invol-
ving the ignition system.
Important
The ignition discharge module must be positioned
with the ignition coils facing down during the test so
that the transformer oil will provide good insulation
in the high-voltage part of the ignition coils.
Saab 9000