On Wed, 02 Feb 2005 18:15:55 -0500, Edward Crismond
> wrote:

>Hi, this is also posted to rec.autos.makers.saturn
>
>I have a 2000 Saturn SL with a high idle problem and a constantly lit=20
>'check engine light'. It only does the high idle intermitantly, when the=
=20
>engine is warmed up. Sitting at a stop light, while in neutral, the RPM=20
>may shoot up to 2000+. It will idle correctly, at around 800 RPM or so,=20
>after shutting the engine off, then restarting it.
>
>Since the 'check engine soon' light is on, I took it to Advance
>Auto and had them do an OBDII scan on the PCM. The code returned was:
>
> P1133
> Manfacurer Contrl.
> Fuel Air Metering

=46rom the FSM:

DTC P1133
The oxygen sensor 1 (O2S-1) is an electrical source that responds to
oxygen content in the exhaust manifold. When the sensor reaches
approximately 316=B0C (600=B0F), it produces a voltage based on the
difference in oxygen between the atmosphere and exhaust gas. The
powertrain control module (PCM) sends a bias voltage, 391-491 mV on the
signal line which is pulled up through high resistance. When the O2S-1
is cold, it produces no voltage and has extremely high internal
resistance. The internal resistance of the sensor is much greater than
the resistance of the bias pull-up resistor. However, when the sensor
heats up, it produces voltage that overrides the bias voltage. This
voltage is read by the PCM to determine a rich/lean O2S-1 signal used to
adjust injector pulse width. Under normal conditions, low sensor voltage
means high oxygen content/lean air-fuel mixture and vice versa. Normal
sensor readings will fluctuate between 10-999 mV. DTC P1133 sets when
the O2S-1 signal has too few switches over a certain length of time.

DTC Parameters
DTC P1133 will set if the O2S-1 signal has not switched greater than 10
times within a 100 second test when:

The engine speed is between 1,500-3,000 RPM.=20
The Loop status is closed.=20
The calculated air flow is greater than 7 gm/s.=20
No camshaft (CAM), crankshaft position (CKP), engine coolant temperature
(ECT), exhaust gas recirculation (EGR), evaporative emission (EVAP)
purge solenoid, fuel trim, intake air temperature (IAT), manifold
absolute pressure (MAP), misfire, O2S-1, system voltage or throttle
position (TP) sensor DTCs have been set.=20
DTC P1133 diagnostic runs once per ignition cycle once the above
conditions have been met.

DTC P1133 is a type B DTC.

Diagnostic Aids
Possible causes of DTC P1133:

An intermittent connection or corrosion in the O2S-1 harness connector
can set this DTC. Use a scan tool to monitor O2S-1 voltage with engine
running at normal operating temperature while wiggling the signal and
ground (circuit 413) wire. Make sure the sensor is tight.=20
The most probable cause for DTC P1133 is contamination. Check for
obvious contamination, oil, fuel or engine coolant, by removing the
sensor. Identify and correct the cause of the contamination if
contaminated. Replace the O2S-1.=20