Daewoo MATIZ Service Manual page 238

1F – 140 ENGINE CONTROLS
Step
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)?
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.
11
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.
3. Install an injector test light on the injector harness
13
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
15
connector for each cylinder that had misfire.
3. Crank the engine.
Does the test light illuminate?
DTC P0300 – Multiple Cylinder Misfire (Cont'd)
Action Value(s) Yes
–
Go to Step 27
–
Go to Step 5
–
Go to Step 7
–
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
No
Go to Step 4
Go to Step 6
Go to Step 11
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
DAEWOO M-150 BL2