Saab 9000 - Page 91

88 Technical Description
Driving a trip (contd.)
50
40
30
20
10
200
400
600
800
1000
2000-3000 RPM
1200
secs
~-------- 13 min
-------....,~1-
3 min
.... ~-
4min
~--------------
20
min _____________
____.._.
1
Clear any diagnostic trouble codes and
un-
plug the temperature sensor connector from
the EDU so that the radiator fan will run conti-
nuously throughout the trip.
2
Diagnosis of the majority of components and
functions except: front heated oxygen sen-
sor, evaporative emission system and three
way catalytic converter.
-
Driving
in town traffic for such a length of time
that vehicle speed exceeds
O
mph
(O
km/h) for
a total of
1 O
minutes.
- ·
braking
at least 6 times from
>
25 mph
(> 40 km/h) to
O
km/h.
3
Diagnosis of the front heated oxygen sensor
and evaporative emission system:
- Stop the car, run the engine at idling speed and
proceed as follows:
-
select
Neutral (or Park) and apply the handbra-
ke.
-
turn
off the A/C
(ACC:
select ECON).
-
do nothing to affect engine load (power steer-
ing, electrical equipment, etc.).
-
depress the accelerator a second or two and
then run the engine at idling speed for 30 se-
conds. Repeat three times.
4
Diagnosis of three way catalytic converter:
-
driving
with steady throttle at 25-56 mph
(40-90km/h) for 4 minutes.
-
select
a gear so that engine speed is
2000-3000rpm.
-
throttle
position changes should be avoided, so
as level a road as possible should be chosen.
5
Final check:
-
Check
whether any diagnostic trouble code has
been generated and take remedial action as ne-
cessary.
-
connect
the temperature sensor to the EDU
-
clear
the diagnostic trouble code for the EDU
temperature sensor.
Saab 9000