Daewoo CIELO EURO III Manual page 491

stored in the Freeze Frame and Failure Records buff-
ers.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
D The MIL will turn off after three (four –
1.5L SOHC) consecutive ignition cycles in which the
diagnostic runs without a fault.
D A history DTC will clear after 40 consecutive warm up
cycles without a fault.
D DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
The catalyst test may abort due to a change in the en-
gine load. Do not change the engine load (i.e. A/C, cool-
ant fan, heater motor) while a catalyst test is in progress.
An intermittent problem may be caused by a poor con-
nection, rubbed-through wire insulation, or a wire that is
broken inside the insulation.
Any circuitry, that is suspected as causing the intermit-
tent complaint, should be thoroughly checked for the fol-
lowing conditions:
D Backed-out terminals
D Improper mating
D Broken locks
D Improperly formed
D Damaged terminals
D Poor terminal-to-wire connection
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
DAEWOO T-154 BL2,3
ENGINE CONTROLS 1F – 321
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. If any component DTCs are set, diagnose those
DTCs first. A fault in a component can cause the
converter to appear degraded or may have caused
its failure.
3. This step includes checks for conditions that can
cause the three-way catalytic converter to appear
degraded. Repair any problems found before pro-
ceeding with this table.
5. If the three-way catalytic converter needs to be re-
placed, make sure that another condition is not pres-
ent which would cause the converter to become
damaged. These conditions may include: misfire;
high engine oil or coolant consumption; retarded
spark timing or weak spark. To avoid damaging the
replacement converter, correct any possible causes
of converter damage before replacing the catalytic
converter.
6. Clearing DTCs allows the catalyst test to be run up to
6 times this ignition cycle. Once the ignition is
cycled, the test will run only once. Driving the vehicle
heats the catalyst to a test temperature. The
ECM must see predetermined amount of time at
above idle before allowing the catalyst test to run at
idle. Once at idle, the ECM will allow the sys-
tem to stabilize and then test the catalyst in 2 stages.
7. If no faults have been found at this point and no addi-
tional DTCs were set, refer to "Diagnostic Aids" in
this section for additional checks and information