130 Fault diagnosis
Diagnostic trouble codes·.P0136, P0138, P0140 (contd.)
3@)
0000
0000
0000
0000
OOc=J
3 Check the oxygen sensor's electrical Inter-
faces
- Unplug the oxygen sensor's 4-pin_connector.
- Replace the sensor with a conventional 1.5 V
battery in good condition.
- Connect the battery's positive
1
(
+) pole to pin 4
of the connector.
- Connect the battery's negative (
➔
pole pole to
pin 3 of the connector .
. - Ignition switch in ON position.
- Connect an ISAT scan tool.
- Select "READ FUNCTIONS".
- Select "O2S 2".
Does the ISAT scan tool show about "1.4V"?
I YES I Change the oxygen sensor and continue
with point 4. ·
INo I Check the leads between:
pin 4 of the connector and pin
70 of the cont-
rol module and between
pin 3 of the connector and pin 4 7 of the cont-
rol module for continuity or shorting and re--
pair or replace them as necessary.
Then continue with point 4.
Saab9000
1.5V
=1.4V
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