Saab 9000 - Page 123

120
Fault
diagnosis
Diagnostic trouble codes ·P0130, P0132, P0133
Front heated oxygen sensor (oxygen sensor 1)
.
Symptom of fault
The CHECK ENGINE lamp (MIL) is on.
Any other diagnostic trouble codes (such as misfir-
ing, closed loop, adaptation).
Conditions
P0130: All-embracingDTC.
P0132: Ignition switch in ON position.
sensor voltage
>
1500 mV for more than 5 sec.
P0133:
Diagnosis not yet performed this trip.
Speed= 0.
Idling speed
Closed loop active.
Coolant temperature
>
60° C
(>
140° F).
Oxygen sensor heating current
<
1500 mA.
Oxygen sensor voltage oscillates at too low a fre-
quency.
592Fa
589
µp
µp
H70-1
23
47 67
50
Diagnostic help
Operation of the oxygen sensor can be ascertained
using an ISAT scan tool.
- Select "READ FUNCTIONS".
.
-
Select "O2S 1
".
When
closed loop is active the ISAT scan tool rea-
ding should oscillate between 0.1 and 0.9 V.
If the reference ground or sensor voltage of any of
the oxygen sensors is short-circuitedto battery posi-
tive (B+) in the wiring harness or in any of the oxygen
sensors, DTCs P0132 and P0138 will probably both
be generated.
The control module inputs of the oxygen sensors are
high-ohmic. If moisture gets into the connectors of
some of the oxygen sensors, a diagnostic trouble co-
de will be generated.
Saab 9000