Daewoo CIELO EURO III Manual page 353

Engine Coolant Temperature (ECT) is greater than
–40 q C (–40 q F).
Intake Air Temperature (IAT) is less than –40 q C
(–40 q F).
The ignition voltage is between 11 and 18 volts.
The average airflow is less than 14 g/sec.
The Throttle Position (TP) sensor is less than 50%
with a 0.4 second delay.
The change in IAT and coolant is less than 7 q C
(44.6 q F).
The start-up coolant is less than or equal to 32 q C
(89.6 q F).
DTCs P0131, P0132, P0134 is not set.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate
after three (1.5L SOHC) or
consecutive trip with a fail.
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.
Conditions for Clearing the MIL/DTC
The MIL will turn off after three (four – 1
1.5L SOHC) 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
An intermittent may be caused by a rubbed-through wire
insulation or a wire contacting the exhaust.
DAEWOO T-154 BL2,3
ENGINE CONTROLS 1F – 184
Check for a poor connection or a damaged harness –
inspect the harness connectors for the following condi-
tions:
Improper mating
Broken locks
Improperly formed
Damaged terminals
Poor terminal to wire connection
Damaged harness
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Table.
1. The On-Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and to store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
2. This step determines if DTC P0141 is the result of a
hard failure or an intermittent condition. With the igni-
tion ON, engine OFF, the HO2S 2 voltage displayed
on the scan tool should change within several min-
utes towards 0 or 1 volt, indicating that the heater is
working properly.
3. Probing terminal D of the HO2S 2 connector verifies
if voltage is available to the HO2S 2 heater.
4. If voltage is available at the connector, it becomes a
good voltage source to check for a ground at termi-
nal C.
5. Determines if voltage is not available at the HO2S
2 due to an open fuse or open ignition feed circuit. If
the fuse is open, determine if it was due to a short in
the ignition feed circuit before replacing the fuse.