Daewoo CIELO EURO III Manual page 328

1F – 159 ENGINE CONTROLS
OXYGEN SENSOR (O2S 1) TOO FEW TRANSITIONS
Circuit Description
The engine control
module (ECM) constantly monitors the oxygen sensor
(O2S 1) activity for 100 seconds. During the monitor pe-
riod, the ECM counts the number of times that the
O2S 1 switches from rich to lean and from lean to rich.
With this information, a total for all switches can be de-
termined. If the number of switches is too low, DTC
P1133 will set.
Conditions for Setting the DTC
Close loop stoichometry.
Engine run time is greater than 60 seconds.
1.5L SOHC
O2S 1 swtiches from 0.3 to 0.6 volt and from 0.6 to
0.3 volt are less than 10 within 90 seconds of monitor-
ing period.
The engine coolant temperature is greater than 70 q C
(158 q F).
The system voltage is greater than 10 volts.
The purge duty cycle (D.C.) is less than 20%.
The rpm is between 1500 and 3000.
The airflow is between 9 and 30 g/sec.
Engine running status within certain range (rpm,
TPS).
No related malfunctions (see P0131) and DTCs
P0131, P0132, P0134, P1167, P1171 are not set.
A 3 second delay after conditions met.
DIAGNOSTIC TROUBLE CODE (DTC) P1133
Action T
The Malfunction Indicator Lamp (MIL) will illuminate
after three (1.5L SOHC) or
consecutive trip with a fail.
Open loop fuel control will be in effect.
The ECM will store conditions which were pres-
ent when the DTC was set as Freeze Frame and in
the Failure Records data.
A history DTC is stored.
Conditions for Clearing the MIL/DTC
The ECM will turn the MIL OFF on the third
(fourth – 1.5L SOHC) consecutive trip
cycle during which the diagnostic has been run and
the fault condition is no longer present.
A history DTC will clear after 40 consecutive warm-up
cycles have occurred without a fault.
DTC(s) can be cleared by using the scan tool .
TAA1F180
DAEWOO T-154 BL2,3