Saab 9000 Service Manual page 158

Fault diagnosis 155
Diagnostic trouble codes P0301, P0302, P0303, P0304 (contd.)
9
0000
0000
0000
0000
OOC=:J
9 Check the relevant injector's control module
output
- Unplug the relevant injector's connector.
- Connect the test lamp to pins 1 and 2 of the in-
jector's connector.
- Ignition switch in the ON position.
-Activate the relevant injector using the ISAT
scan tool and the activation command
"INJECTOR CYL 1 ", CYL 2, CYL 3 OR CYL 4.
The test lamp should flash at a frequency of 1 O Hz
for 1 O seconds. Repeat the command in the event of
uncertainty.
Does the test lamp flash?
I
YES
I
Continue with point 1
o.
I
NO
I
The test lamp flashes or remains on continu-
ously. Check and, if necessary, rectify the le-
ad between pin 2 and the relevant control
module output.
If the lead is OK, proceed to point 12.
10
10 Check the resistance of the relevant injector
- Take a resistance reading across pins 1 and 2
of the relevant injector's connector. ·
Nominal resistance is: 12 ± 0.35 ohms at
20° C (68°F).
Is the resistance reading OK?
I
YES
I
Continue with point 11.
I
NO
I
Change the injector and proceed to point 12.
Saab9000
I