Daewoo CIELO EURO III Manual page 409

Circuit Description
The engine control
module (ECM) monitors the crankshaft and camshaft
position to detect if the engine is misfiring. The
ECM looks for a quick drop in crankshaft speed. This
test is executed in blocks of 100 camshaft revolution
tests. It may take between one to several tests to store a
Diagnostic Trouble Code (DTC) and illuminate the Mal-
function Indicator Lamp (MIL). Under light misfire condi-
tions, it may also take more than one trip to set a DTC.
Severe misfire will flash the MIL indication that catalyst
damage is possible. The Torque Converter Clutch is dis-
abled momentarily to determine if the misfire was due to
a rough road condition (automatic transaxle only).
Conditions for Setting the DTC
DTC(s) P0106, P0107, P0108, P0117, P0118,
P0122, P0123, P0336, P0337,
P0341, P0342 and P0502 are not set.
A/C compressor clutch has not just engaged or disen-
gaged.
Engine load and engine speed is in a detectable re-
gion and is at or above zero torque.
Camshaft Position (CMP) sensor is in synchroniza-
tion.
Exhaust Gas Recirculation (EGR) flow diagnostic is
not is progress.
Decel Fuel Cut-Off (DFCO) is not active.
An automatic transmission is not shifting.
Crankshaft speed patterns are normal.
Vehicle voltage is between 11 and 16 volts.
Coolant temperature is between –7 q C (19.4 q F) and
120 q C (248 q F).
There is the correct ratio between Crankshaft Posi-
tion (CKP) sensor pulses and CMP sensor pulses.
1.5L SOHC
Engine run time is greater than and equal to 20 en-
gine cycles (3 second at 800 rpm).
Fuel level is greater than 11% rated tank capacity.
Fuel is not shutoff from high engine speed of 6500
rpm for M/T or 6500 rpm for A/T in drive and 6250
rpm in park for A/T vehicle.
The change of positive throttle position is less than
3.0% / 125 milliseconds and the change of minus
throttle position is less than 3.0% / 125 milliseconds.
Have not encountered an abusive engine speed of
7000 rpm.
Engine acceleration rate is less than or equal to 10
consecutive powerstrokes.
Engine deceleration rate is less than or equal to 12
consecutive powerstrokes.
DAEWOO T-154 BL2,3
DIAGNOSTIC TROUBLE CODE (DTC) P0304
CYLINDER 4 MISFIRE
ENGINE CONTROLS 1F – 239
Throttle position is less than 4.0% when the vehicle is
greater than 6.2 mph (10 km/h).
Engine speed is between 600 and 4500 rpm.
Engine speed is less than or equal to 1600 rpm or the
crank angle sensing error has been learned.
Fuel is not shutoff at 158.4 mph (255 km/h).
Action Taken When the DTC Sets
The MIL will illuminate after two consecutive ignition
cycles in which the diagnostic runs with the fault ac-
tive.
Or
The MIL will illuminate immediately and flash if cata-
lyst damaging level misfire is present (automatic
only).
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.