Daewoo MATIZ Service Manual page 388

1F – 290 ENGINE CONTROLS
Step
Were the Important Preliminary Checks performed?
1
1. Fill the fuel tank with a known good grade of
gasoline that has the octane rating of the value
specified.
2
2. Reevaluate the vehicle's performance.
Does the detonation problem still exist?
1. Inspect for low engine coolant level.
2. Check for restricted airflow to the radiator or
restricted coolant flow.
3
3. Check for a faulty thermostat.
4. Check for an incorrect coolant solution.
Is the problem found?
Repair or replace any cooling system components
as needed.
4
Is the repair complete?
1. Check the engine coolant temperature using the
scan tool.
2. Replace the Engine Coolant Temperature (ECT)
sensor if the resistance is not within specifications
5
as listed in the Diagnostic Aids for diagnostic
trouble code P0118.
Is the problem found?
Replace the ECT sensor or repair the circuit as
needed.
6
Is the repair complete?
1. Check the ignition system output with a spark
tester.
2. Inspect the spark plugs for the proper heat range
and gap.
7
3. Check for the proper operation of the ignition
controls.
Is the ignition system operating properly?
Repair or replace the ignition system components as
needed.
8
Is the repair complete?
1. Connect the scan tool to the Data Link Connector
(DLC).
2. Road test the vehicle at the speed of the
complaint.
9
3. Monitor the long term fuel trim reading from the
scanner data stream.
Is the long term fuel trim reading above the value
specified?
Check the fuel system pressure.
10
Is the problem found?
Repair or replace the fuel system components as
needed.
11
Is the repair complete?
DETONATION/SPARK KNOCK
Action Value(s) Yes
–
Go to Step 2
91 octane Go to Step 3
–
Go to Step 4
–
System OK
–
Go to Step 6
–
System OK
–
Go to Step 9
–
System Ok
Go to
"Diagnostic Aids
25% for DTC P0171"
380 kPa
(55 psi) Go to Step 11
–
System OK
No
Go to
"Important
Preliminary
Checks"
System OK
Go to Step 5
–
Go to Step 7
–
Go to Step 8
–
Go to Step 10
Go to Step 12
–
DAEWOO M-150 BL2