Saab 9000 - Page 136

Fault diagnosis
133
Diagnostic trouble code P0141 (contd.)
1
[[ ~P0135, P0141
I
0000
0000
0000
0000
0 0
c::J
Diagnostic procedure
1 Check additional diagnostic trouble codes in
the Trionic system
- Obtain readouts of all diagnostic trouble codes
using the ISAT scan tool.
Are P0135 and P0141 present?
I
YES
I
Continue with point 2.
I NO
I
Continue with point 3.
2
~
~
>5mln
1.8-4.0!l
2
Check the oxygen sensors' heating circuit re-
sistance
The engine should have been switched off for at least
5 minutes.
~
Check fuse 28 and change it if necessary.
- Unplug the 4-pin connectors of both oxygen
sensors.
- Check the resistance of both sensors:
pins 1-2 ________ 1.8-4.0 ohms
Are the resistance readings OK?
I YES
I Repair or replace the leads between pin 1 of
the connectors of both oxygen sensors and
fuse 28. Then continue with point 4.
Change the relevant oxygen sensor and
proceed to point 4.
Saab 9000
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