Daewoo MATIZ Service Manual page 234

1F – 136 ENGINE CONTROLS
Step
1. Turn the ignition ON, with the engine OFF.
2. Review the Freeze Frame data, and note the
parameters.
6
3. Operate the vehicle within the Freeze Frame
conditions and conditions for setting this DTC as
noted.
Are any Misfire Current counters incrementing?
1. Turn the engine OFF.
2. Install a fuel pressure gauge to the fuel rail.
7
3. Observe the fuel pressure with the engine
running.
Is the fuel pressure within the specified value?
Check the fuel for contamination.
8
Is the fuel OK?
Check for a basic engine problem and repair as
necessary.
9
Is the repair complete?
Replace the contaminated fuel.
10
Is the repair complete?
1. Turn the engine OFF.
2. Disconnect the fuel injector harness connector.
3. Install a spark tester on cylinder #1 spark plug
cable.
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4. Crank the engine and check for spark.
5. Repeat the above procedure on cylinders #2, #3.
Is a spark observed on all four spark plug cables?
Replace any malfunctioning spark plugs if
necessary.
12
Is the repair complete?
1. Turn the engine OFF.
2. Disconnect the fuel injector connectors from the
injectors.
13 3. Install an injector test light on the injector harness
connector for the cylinders that had misfired.
4. Crank the engine and note the test light.
Does the injector test light blink?
Perform the Fuel Injector Balance Test.
14
Are the fuel injectors OK?
1. Disconnect the injector test light.
2. With a test light connected to ground, probe the
ignition feed terminal 1 of the injector harness
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connector for each cylinder that had misfire.
3. Crank the engine.
Does the test light illuminate?
Replace any malfunctioning fuel injectors.
16
Is the repair complete?
Check the affected fuel injector driver circuit at
terminals 90, 58 and 89 for an open, short, or short
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to voltage.
Is a problem found?
DTC P0300 – Multiple Cylinder Misfire (Cont'd)
Action Value(s) Yes
–
Go to Step 5
284–325 kPa
Go to Step 8
(41–47 psi)
–
Go to Step 9
–
Go to Step 27
–
Go to Step 27
–
Go to Step 12
–
Go to Step 27
–
Go to Step 14
–
Go to Step 9
–
Go to Step 17
–
Go to Step 27
–
Go to Step 18
No
Go to
"Diagnostic
Aids"
Go to
"Fuel System
Diagnosis"
Go to Step 10
–
–
Go to Step 20
Go to Step 13
Go to Step 15
Go to Step 16
Go to Step 19
–
Go to Step 24
DAEWOO M-150 BL2