Daewoo Matiz (2003 year). Manual - part 30

1F – 30  ENGINE CONTROLS

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

No Malfunction Indicator Lamp

Step

Action

Value(s)

Yes

No

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 3

Go to Step 6

3

Check terminals for damage or poor connection.
Does any problem found?

–

Go to Step 5

Go 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”

–

6

Check the fuse F1.
Is the fuse blown?

–

Go to Step 7

Go 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 – 32  ENGINE CONTROLS

MAA1F030

MALFUNCTION INDICATOR LAMP ON STEADY

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.

ENGINE CONTROLS  1F – 33

Malfunction Indicator Lamp On Steady

Step

Action

Value(s)

Yes

No

1

Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Is the check complete.

–

Go to Step 2

Go to “Euro

On-Board

Diagnostic

System Check”

2

1. Turn the ignition OFF.
2. Install the scan tool.
3. Command the Malfunction Indicator Lamp (MIL)

on and off.

Does the MIL turn on and off when commanded?

–

Go to Step 7

Go to Step 3

3

1. Turn the ignition OFF.
2. Disconnect the engine control module (ECM)

connector.

3. Turn the ignition ON.
Is the MIL off?

–

Go to Step 6

Go to Step 4

4

Check the MIL control circuit for a short to ground
and repair as needed.
Is a repair necessary?

–

Go to Step 7

Go to Step 5

5

Replace the instrument panel cluster. Refer to
Section 9E, Instrumentation/Driver Information.
Is the repair complete?

–

Go to Step 7

–

6

Replace the ECM.
Is the repair complete?

–

Go to Step 7

–

7

1. Using the scan tool, clear the Diagnostic Trouble

Codes(DTCs).

2. Attempt to start the engine.
Does the engine start and continue to run?

–

Go to Step 8

Go to Step 1

8

Allow the engine to idle until normal operating
temperature is reached.
Check if any DTCs are set.
Are any DTCs displayed that have not been
diagnosed?

–

Go to applicable

DTC table

System OK