Saab 9000 - Page 115

112 Fault diagnosis
Diagnostic trouble codes P0120, P0121, P0122, P0123
Throttle position sensor
Symptom of fault
The CHECK ENGINE lamp (MIL) is on.
High idling speed.
A/C compressor does not work.
Conditions
P0120: All-embracing OTC.
P0121 Engine running and throttle closed:
>
1
V or <0.24 V · ·
P0122 Engine running:
<0.2 V for 5 seconds.
P0123: Engine running:
>4.96 V for 5 seconds.
µp
45 42
Diagnostic help
The throttle position sensor reading can be obtained
on an ISAT scan tool.
- Turn the ignition switch to the ON position and
then back to the
qFF position.
-
Connect an ISAT scan tool.
- Select "READ FUNCTIONS".
- Select 'THROTTLE POSITION".
If the throttle position sensor is in perfect working or-
der the ISAT scan tool should show the current
throttle position, 10-90% (0.5 - 4.5 V) from fully up
(not depressed) to fully depressed accelerator.
Saab 9000