Saab 9000 - Page 202

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Fault diagnosis 199
Diagnostic trouble codes P1170 P1171, P1172 (contd.)
1.5V
-_---:._-_-_--
['---[·
---~
0000
0000
DODD
0000
O
□
c=J
4 Check the front heated oxygen sensor's elec-
trical Interface
Does the ISAT scan tool show about "1.4 V"?
IJA
I
Plug in the oxygen sensor and continue with
point 5.
- Unplug the oxygen sensor's 4-pinconnector.
- Replace the oxygen sensor with a conventional
1.5 V dry battery in good .condition.
- Connect the battery's positive(+) pole to pin 4
of the connector.
- Connect the battery's
-J>Ositive
(
+) pole to pin
3 of the connector.
- Ignition switch in ON position.
- Connect an ISATscan tool.
- Select
"READ
FUNCTIONS".
-
Select
"O2S
1 ".
Read
off the voltage shown on the ISAT scan tool.
I
NEJ
I
Check the leads between pin 4 of the con-
nector and pin 23 of the control module and
between pin 3 of the connector and pin 4 7 of
the control module for continuity and shor-
ting. Rectify as necessary.
Then continue with point 6.
Saab9000
I