Daewoo CIELO EURO III Manual page 341

System voltage is greater than 10 volts.
No related malfunctions (See P0131) and DTC
P0141 is not set.
Closed loop (C/L) test:
HO2S 2 voltage is less than 0.1 volt.
3 second delay after in close loop.
Power Enrichment (PE) test:
HO2S 2 voltage is less than 0.42 volt.
Air/fuel ratio is less than or equal to 13.5:1.
3 second delay after in Decel Fuel Cut-Off (DFCO).
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 –
1.5L 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 rubbed-through wire
insulation or a wire contacting the exhaust.
DAEWOO T-154 BL2,3
ENGINE CONTROLS 1F – 172
Check for the following conditions:
Exhaust system – Inspect the exhaust system for
leaks. Check the exhaust between the three-way cat-
alytic converter and the flange for leaks, corrosion, or
for loose or missing hardware and repair as neces-
sary.
Poor connection or damaged harness – Ensure that
the HO2S 2 pigtail is not contacting the exhaust.
Check for the following conditions:
Improper mating
Broken locks
Improperly formed
Damaged terminals
Poor terminal to wire connection
Damaged harness
Intermittent test – Observe HO2S 2 on scan tool
while moving related connections and the wiring har-
ness with the ignition ON. If the failure is induced, the
HO2S 2 display will change. This may help isolate the
location of the malfunction.
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 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 P0137 is the result of a
hard failure or an intermittent condition.
4. Jumping circuit A to ground is necessary to allow the
ECM to display the supplied bias voltage. If the
voltage is between 0.35 and 0.55 volts, then the wir-
ing and the ECM are OK.
6. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.