Daewoo MATIZ Service Manual page 233

DIAGNOSTIC TROUBLE CODE (DTC) – P0300 MULTIPLE CYLINDER MISFIRE
System Description
The Engine Control Module (ECM) monitors the crank-
shaft and camshaft positions 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 engine rev-
olution tests. It may take between one to several tests to
store a Diagnostic Trouble Code (DTC) and illuminate
the Malfunction Indicator Lamp (MIL). Under light misfire
conditions, it may also take more than one trip to set a
DTC. Severe misfire will flash the MIL, indicating that
catalyst damage is possible.
Conditions for Setting the DTC
D Emission threshold is 3.0% for manual transaxle.
D 20 engine cycles have occurred since cranking has
started.
D A/C compressor clutch has not just engaged or disen-
gaged.
D Engine load and engine speed are in a detectable re-
gion and are at or above zero torque.
D Camshaft Position (CMP) sensor is in synchroniza-
tion.
D Electric Exhaust Gas Recirculation (EEGR) flow
diagnostic is not in progress.
D Fuel level is greater than or equal to 20% of rated
tank capacity.
D Decel Fuel Cutoff (DFCO) not active.
D Fuel is not shutoff from high engine speed of 6500
rpm for manual transaxle vehicle.
D Fuel is not shutoff at 255 km/h (158 mph).
D Throttle position change is less than 3% per 125 ms.
D Vehicle has not encountered an abusive engine
speed of 7000 rpm.
Step
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
1
Was the check performed?
1. Install a scan tool to the Data Link Connector
(DLC).
2. Turn the ignition ON, with the engine OFF.
2
3. Request Diagnostic Trouble Codes (DTCs)
Are DTCs P0201, P0202, P0203, P0204 set?
Perform a visual/physical inspection.
3 Make any repairs that are necessary.
Is the repair complete?
Start the engine and allow it to idle.
4
Are any Misfire Current counters incrementing?
Are all counters equal (within a percentage of each
5
other)?
DAEWOO M-150 BL2
DTC P0300 – Multiple Cylinder Misfire
Action
ENGINE CONTROLS 1F – 135
D Crankshaft speed patters are normal.
D Throttle position is less than 4% when vehicle speed
is greater than 10 km/h (6 mph).
D Engine speed is between 800 and 4500 rpm.
D Vehicle voltage is between 11 and 16 volts.
D Engine Coolant Temperature (ECT) is between –7°C
(20°F) and 120°C (248°F).
D The engine speed is less than or equal to 1800 rpm or
the crank angle sensing error has not been learned.
D There is the correct ratio between Crankshaft Posi-
tion (CKP) sensor pulses and CMP sensor pulses.
D DTCs P0106, P0107, P0108, P0117, P0118, P0122,
P0123, P0320, P0337, P0341, P0342 and P0502 are
not set.
Action Taken when the DTC Sets
D The malfunction Indicator Lamp (MIL) will blinking.
D The ECM will record operating conditions at the time
the diagnostic fails. The information will be stored in
the Freeze Frame and failure records buffers.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
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
An intermittent can also be the result of a defective re-
luctor wheel. Remove the CKP sensor and inspect the
reluctor wheel through the sensor mount hole. Check for
porosity and the condition of wheel. If the DTC is inter-
mittent refer to "Symptoms Diagnosis" in this section.
Value(s)
–
Go to Step 2
–
Applicable DTC
–
Go to Step 27
–
Go to Step 5
–
Go to Step 7
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to
table
Go to Step 3
Go to Step 4
Go to Step 6
Go to Step 11