Daewoo CIELO EURO III Manual page 316

1F – 147 ENGINE CONTROLS
Circuit Description
The engine control module (ECM) supplies
a voltage of about 0.45 volts between
terminals M12 and M29 (if measured
with a 10 M : digital voltmeter, this may read as
low as 0.32 volts). The Oxygen Sensor (O2S 1) varies
the voltage within a range of about 1 volt if the exhaust is
rich, down through about 0.10 volts if the exhaust is
lean.
The sensor is like an open circuit and produces no volt-
age when it is below 315 q C (600 q F). An open sensor cir-
cuit or cold sensor causes Open Loop operation.
If the O2S 1 pigtail wiring, connector, or terminal is dam-
aged, the entire O2S 1 assembly must be replaced. Do
not attempt to repair the wiring, connector, or terminals.
In order for the sensor to function properly, it must have
a clean air reference provided to it. This clean air refer-
ence is obtained by way of the O2S 1 wire(s). Any at-
tempt to repair the wires, connector or terminals could
result in the obstruction of the air reference and degrade
the O2S 1 performance. Refer to "Oxygen Sensor" in
this section.
Conditions for Setting the DTC
Closed loop stoichometry.
The Engine Coolant Temperature (ECT) is greater
than 60 q C (140F).
DTCs P0106, P0107, P0108, P0117, P0118, P0122,
P0123, P0171, P0172, P0201, P0202, P0203,
P0204, P0300, P0336, P0337, P0351, P0352,
P0402, P0404, P0405, P0406, P0506, P0507 and
P1404 are not set.
DIAGNOSTIC TROUBLE CODE (DTC) P0131
OXYGEN SENSOR (O2S 1) LOW VOLTAGE
1.5L SOHC
O2S 1 voltage is less than 0.1 volt.
System voltage is greater than 10 volts.
DTC P0443 is not set.
A 3 seconds delay after conditions met.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate.
The ECM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Freeze Frame and Failure Records buff-
ers.
A history DTC is stored.
The vehicle will operate in Open Loop.
Conditions for Clearing the MIL/DTC
The MIL will turn off after three consecutive ignition
cycles in which the diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm up
cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
Fuel pressure – The system will be lean if the fuel pres-
sure is too low. It may be necessary to monitor the fuel
pressure while driving the vehicle at various road
TAA1F180
DAEWOO T-154 BL2,3