Daewoo CIELO EURO III Manual page 349

1.5L SOHC
The HO2S 2 voltage is between 0.4222 and 0.478
volt.
3 second delay after exit Decel Fuel Cut-Off (DFCO).
Airflow is greater than 7 g/sec.
No related malfunctions (See P0131) and DTC
P0141 is not set.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate
after three (1.5L SOHC)
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 a rubbed-through wire
insulation or a wire contacting the exhaust.
Check for the following conditions:
A poor connection or a damaged harness – Inspect
the harness for a short to ground in the sensor signal
DAEWOO T-154 BL2,3
ENGINE CONTROLS 1F – 180
circuit. Ensure that the HO2S 2 pigtail is not contact-
ing 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 the scan tool
while moving the related connections and the wiring
harness 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 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 P0140 is the result of a
hard failure or an intermittent condition.
4. Disconnecting the HO2S 2 and jumpering the sen-
sor signal circuit and the sensor low circuit to ground
will determine if the ECM or wiring or HO2S
2 is malfunctioning.
6. Determines which circuit the malfunction is in. If the
sensor signal circuit and the sensor low circuit are
OK, then the ECM connection or ECM is
malfunctioning.
10. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.