2003 DAEWOO MATIZ fuse

ENGINE CONTROLS 1F–29
DAEWOO M-150 BL2
Engine Cranks But Will Not Run (Cont’d)
StepActionValue(s)YesNo
42
1. Turn the ignition OFF.
2. Connect test light between fuel injector harness
connector 2 and battery positive.
3. Crank the engine.
4. Repeat step 2 and 3 for each of the remaining
fuel injectors.
Does the test light flash for all of the fuel injectors?
–
Go to Step 43Go to Step 46
43
Measure the resistance of each fuel injectors.
Is the resistance within the value specified.
Note: the resistance will increase slightly at higher
temperature.
13.75–15.25
ΩSystem OKGo to Step 44
44
Replace any of the fuel injectors with a resistance
out of specification.
Is the repair complete?
–
Go to Step 2
–
45
1. Inspect the fuse EF19 in engine fuse block.
2. Check for an open between the circuit from
terminal 2 of the three fuel injectors and terminal
87 of main relay.
Is the problem found?
–
Go to Step 48
Go to “Main
Relay Circuit
Check”
46
Measure the resistance between following terminals.

Terminal 1 of injector 1 connector and terminal 30
of ECM connector.

Terminal 1 of injector 2 connector and terminal 58
of ECM connector.

Terminal 1 of injector 3 connector and terminal 89
of ECM connector.
Does the resistance within the specified value?
0 ΩGo to Step 49Go to Step 47
47Repair the open fuel injector harness wire(s).
Is the repair complete?–Go to Step 2–
48Replace the fuse or repair the wiring as needed.
Is the repair complete?–Go to Step 2–
49Replace the ECM.
Is the repair complete?–Go to Step 2–

1F–30 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F030
NO MALFUNCTION INDICATOR LAMP
Circuit Description
When the ignition is turned ON, the Malfunction Indica-
tor Lamp (MIL) will be turned ON and remain ON until
the engine is running, if no Diagnostic Trouble Codes
(DTCs) are stored. Battery voltage is supplied through
the ignition switch directly to the MIL telltale. The Engine
Control Module (ECM) controls the MIL by providing a
ground path through the MIL control circuit to turn ON
the MIL.
Diagnostic Aids
An open ignition F16 fuse will cause the entire cluster to
be inoperative.Check the battery and ignition feed circuits for poor con-
nections if the MIL is intermittent.
Any circuitry, that is suspected as causing an intermit-
tent complaint, should be thoroughly checked for
backed-out terminals, improper mating, broken locks,
improperly formed or damaged terminals, poor terminal-
to-wiring connections or physical damage to the wiring
harness.

ENGINE CONTROLS 1F–31
DAEWOO M-150 BL2
No Malfunction Indicator Lamp
StepActionValue(s)YesNo
1
Attempt to start the engine.
Does the engine start?
–
Go to Step 2
Go to “Engine
Cranks But
Will Not Run”
2
1. Turn the ignition OFF.
2. Disconnect the engine control module (ECM)
connector.
3. Turn the ignition ON.
4. Connect a test light between terminal 68 of ECM
connector and ground.
Is the test light on?
–
Go to Step 3Go to Step 6
3Check terminals for damage or poor connection.
Does any problem found?–Go to Step 5Go to Step 4
4
Replace ECM
Is the repair complete?
–
Go to “On
Board
Diagnostic
System Check”
–
5
Repair any damaged terminals or poor connection.
Is the repair complete?
–
Go to “On
Board
Diagnostic
System Check”
–
6Check the fuse F1.
Is the fuse blown?–Go to Step 7Go to Step 8
7
1. Check for a short to ground in the circuit and
repair as needed.
2. Replace the blown fuse.
Is the repair complete?
–
Go to “On
Board
Diagnostic
System Check”
–
8
1. Check for an open circuit between fuse F16 and
terminal 68 of ECM connector and repair as
needed.
2. Check the MIL bulb and replace if blown.
Is the repair complete?
–
Go to “On
Board
Diagnostic
System Check”
–

1F–34 ENGINE CONTROLS
DAEWOO M-150 BL2
FUEL SYSTEM DIAGNOSIS
Circuit Description
The fuel pump is an in-tank type mounted to a fuel send-
er assembly. The fuel pump will remain on as long as the
engine is cranking or running and the Engine Control
Module (ECM) is receiving reference pulses from the
crankshaft position (CKP) sensor. If there are no refer-
ence pulses, the ECM will turn off the fuel pump two sec-
onds after the ignition switch is turned ON or two
seconds after the engine stops running. The fuel pump
delivers fuel to the fuel rail and the fuel injectors, where
the fuel system pressure is controlled from 380 kPa (55
psi) by the fuel pressure regulator. The excess fuel is re-
turned to the fuel tank.
Caution: The fuel system is under pressure. To
avoid fuel spillage and the risk of personal injury orfire, it is necessary to relieve the fuel system pres-
sure before disconnecting the fuel lines.
Caution: Do not pinch or restrict nylon fuel lines.
Damage to the lines could cause a fuel leak, result-
ing in possible fire or personal injury.
Fuel Pressure Relief Procedure
1. Remove the fuel cap.
2. Remove the fuel pump fuse EF23 from the engine
fuse block.
3. Start the engine and allow the engine to stall.
4. Crank the engine for an additional 10 seconds.
Fuel System Pressure Test
Step Action Value(s) Yes No




1




1. Relieve the fuel system pressure.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure around the values specified and
holding steady?



380 kPa
(55 psi)



System OK



Go to Step 2




2




1. Relieve the fuel system pressure.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure around the values specified but
not holding steady?


380 kPa
(55 psi)



Go to Step 13



Go to Step 3

3

Inspect the fuel lines for a leak.
Is the problem found?
–

Go to Step 4

Go to Step 5




4




1. Replace the fuel line(s) as needed.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure around the values specified and
holding steady?


380 kPa
(55 psi)



System OK




–




5




1. Remove the fuel pump assembly.
2. With the fuel pump under pressure, inspect the
fuel pump coupling hoses for leaking.
Is the problem found?



–



Go to Step 6



Go to Step 7





6





1. Tighten or replace the fuel pump coupling hoses
as needed.
2. Install a fuel pressure gauge.
3. Turn the ignition ON.
Is the fuel pressure around the values specified and
holding steady?




380 kPa
(55 psi)




System OK




Go to Step 8

7


With the fuel system under pressure, inspect the fuel
return outlet for leaking.
Is the problem found?
–

Go to Step 8

Go to Step 9

ENGINE CONTROLS 1F–37
DAEWOO M-150 BL2
Fuel Pump Relay Circuit Check (Cont’d)
StepActionValue(s)YesNo
3
1. Check for an open circuit between fuel pump test
connector and ground G401, and repair as
needed.
2. Check for the fuel cut-off switch and reset or
replace the fuel cut off switch.
Is the repair complete?
–
System OKGo to Step 4
4
1. Turn the ignition OFF.
2. Disconnect the fuel pump relay.
3. Connect a test light between the fuel pump relay
connector terminal 66 and battery positive.
4. Turn the ignition ON.
Is the test light on?
–
Go to Step 6Go to Step 5
5
Check for an open circuit between terminal 66 of fuel
pump relay and battery positive and repair as
needed.
Is the repair complete?
–
System OK
–
6
1. Turn the ignition OFF.
2. Connect a test light between the fuel pump relay
connector terminal 85 and ground.
3. Turn the ignition ON.
Is the test light on?
2 secGo to Step 8Go to Step 7
7
Check for an open circuit between terminal 85 of fuel
pump relay and terminal 10 of ECM, and repair as
needed.
Is the repair complete?
–
System OK
–
8
1. Turn the ignition OFF.
2. Connect a test light between the fuel pump relay
connector terminal 30 and ground.
Is the test light on?
–
Go to Step 10Go to Step 9
9
1. Check the fuse EF19, if blown, repair short circuit
between fuel pump relay 30 terminal.
2. Replace the fuse as needed.
3. Repair an open circuit as needed.
Is the repair complete?
–
System OK
–
10
1. Turn the ignition OFF.
2. Measure the resistance between following
terminals:

Terminal 87 of fuel pump relay and terminal 1
of the fuel cut-off switch(or terminal 1 of
connector C201).
Does the resistance within the value specified.
0 ΩGo to Step 12Go to Step 11
11Repair an open circuit as needed.
Is the repair complete?–System OK–
12Replace the fuel pump relay.
Is the repair complete?–System OKGo to Step 13
13Replace the ECM.
Is the repair complete?–System OK–

1F–38 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F050
MAIN RELAY CIRCUIT CHECK
Circuit Description
When the ignition is turned On or to the START position,
the main relay is energized. The main relay then supply
voltage to the engine fuse block fuse EF25 and EF26.
The Electronic Ignition (EI) system ignition coil is sup-
plied voltage through the engine fuse block fuse EF26.
The fuel injectors are supplied voltage through the en-
gine fuse block fuse EF25.Diagnostic Aids

An intermittent problem may be caused by a poor
connection, rubbed through wire insulation, or a bro-
ken wire inside the insulation.

A fault main relay will cause a no start condition.
There will be no voltage supplied to the EI system
ignition coil, or the fuel injectors. Without voltage sup-
plied to these components, they will not operate.

ENGINE CONTROLS 1F–39
DAEWOO M-150 BL2
Main Relay Circuit Check
StepActionValue(s)YesNo
1
1. Turn the ignition OFF.
2. Disconnect the engine fuse block fuse EF26.
3. Turn the ignition ON.
4. With a test light connected to the ground, probe
the fuse terminals nearest the main relay for fuse
EF19.
Is the light on at both terminal?
–
System OKGo to Step 2
2Is the light on at only one terminal?–Go to Step 3Go to Step 4
3
Repair the open in the wiring between the main relay
connector terminal 30 and the fuse EF19 as needed.
Is the repair complete?
–
System OK
–
4
1. Turn the ignition OFF.
2. Remove the main relay.
3. Turn the ignition ON.
4. With a test light connected to the ground, probe
the main relay terminals 85 and 30.
Is the light on at both terminals.
–
Go to Step 8Go to Step 5
5
1. Turn the ignition OFF.
2. Check engine fuse block fuse EF19.
Is one or both fuse blown?
–
Go to Step 6Go to Step 7
6
1. Repair short circuit between terminal 87 of main
relay and heated oxygen sensor
2. Replace fuse EF19.
Is the repair complete?
–
System OK
–
7
Repair open circuit between terminal 30 of main
relay and fuse EF19.
Is the repair complete?
–
System OKGo to Step 8
8
1. Turn the ignition OFF.
2. Measure the resistance between following
terminals.

Terminal 86 of main relay and ground.

Terminal 87 of main relay and ground.
Is the resistance within the specified value
0 ΩGo to Step 10Go to Step 9
9Repair open circuit.
Is the repair complete?–System OK–
10Replace the main relay.
Is the repair complete?–System OK–

1F–42 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F070
IDLE AIR CONTROL SYSTEM CHECK
Circuit Description
The Engine Control Module (ECM) controls the engine
idle speed with the Idle Air Control (IAC) valve. To in-
crease the idle speed, the ECM pulls the IAC pintle
away from its seat, allowing more air to pass by the
throttle body. To decrease the idle speed, it extends the
IAC valve pintle toward its seat, reducing bypass air
flow. A scan tool will read the ECM commands to the
IAC valve in counts. The higher counts indicate more air
bypass (higher idle). The lower counts indicate less air is
allowed to bypass (lower idle).
Diagnostic Aids
If the idle is too high, stop the engine. Fully extend the
Idle Air Control (IAC) valve with a IAC driver. Start the
engine. If the idle speed is above 950 rpm, locate and
repair the vacuum leak. Also, check for a binding throttle
plate or throttle linkage or an incorrect base idle setting.
Idle Air Control Valve Reset Procedure
Whenever the battery cable or the Engine Control Mod-
ule (ECM) connector or the ECM fuse EF6 is discon-nected or replaced, the following idle learn procedure
must be performed:
1. Turn the ignition ON for 5 seconds.
2. Turn the ignition OFF for 10 seconds.
3. Turn the ignition ON for 5 seconds.
4. Start the engine in park/neutral.
5. Allow the engine to run until the engine coolant is
above 85C (185F ).
6. Turn the A/C ON for 10 seconds, if equipped.
7. Turn the A/C OFF for 10 seconds, if equipped.
8. If the vehicle is equipped with an automatic trans-
axle, apply the parking brake. While pressing the
brake pedal, place the transaxle in D (drive).
9. Turn the A/C ON for 10 seconds, if equipped.
10. Turn the A/C OFF for 10 seconds, if equipped.
11. Turn the ignition OFF. The idle learn procedure is
complete.