Saab 9000 - Diagnostic Trouble Codes P0136, P0138, P0140

Fault diagnosis 129
Diagnostic trouble codes P0136, P0138, P0140 (contd.)
1
[[ ~ P0132, P0138 I
DODD
DODD
0000
DODO
00(:=J
Diagnostic procedure
1 Check additional diagnostic trouble codes in
the Trionic system
- .Obt~in readouts of all diagnostic trouble codes·
using the ISAT scan tool.
Are P0132 and P0138 present?
I YES I Continue with point 2.
I NO I Continue with point 3.
2
~
OL
2 One of the oxygen sensor leads connected to
electronic control module pin 23, 70 or 47 is
short-circuited to battery positive (B+) in the
wiring harness or in one of the oxygen sen-
sors.
Check the insulation of the oxygen sensors.
- Unplug the 4-pin connectors of both oxygen
sensors.
- Check the resistance of both sensors
• pins
1-3. ___________ Ol
(Overload= infinite resistance)
• pins 1-4 ___________ Ol
(Overload= infinite resistance)
Are all readings OK?
I YES I Rectify the lead between the connectors of
both sensors and pin 23,
70 or 47 of the
electronic control module and then proceed
to·point 4.
I NO I Change the relevant oxygen sensor and
proceed to point 4.
Saab9000
I