Daewoo Matiz (2003 year). Manual - part 291

9T – 20  IMMOBILIZER ANTI-THEFT SYSTEM

DAEWOO M–150 BL2

D209T002

DIAGNOSTIC TROUBLE CODE (P) 1628 (SIRIUS D3)

ECM IMMOBILIZER ERROR (NO SUCCESSFUL COMMUNICATION)

Circuit Description

When the ignition is turned ON, the key is tested by the
immobilizer anti-theft system. While the key code is be-
ing read by the immobilizer control unit, the engine can
start and run with any key that will turn the lock cylinder.
The key code is read and compared with key codes that
have been stored in the memory of the immobilizer con-
trol unit. If a valid key is detected, the immobilizer control
unit sends a serial data release message to the elec-
tronic control module (ECM). Included in the release
message is an identification (ID) code which assures
that neither the immobilizer control unit nor the ECM has
been substituted to defeat the system. If the ECM re-

ceives an invalid release message, the ECM performs
the following actions:

D

Disables the fuel injector circuit.

P 1628 Will Set When

D

The ECM does not receive the signal from the immo-
bilizer control module within 1.260 seconds after the
ignition is turned on.

D

The above conditions are maintained until the ignition
is switched OFF.

P 1628 Will Clear When

D

The ignition switch is turned OFF or the scan tool
TROUBLE CODE CLEAR command is issued.

IMMOBILIZER ANTI-THEFT SYSTEM  9T – 21

DAEWOO M–150 BL2

P 1628 – ECM Immobilizer Error (No Successful Communication)

Step

Action

Value

Yes

No

1

Connect the scan tool using the following procedure:
1. Insert the cartridge into the scan tool.
2. Turn the ignition switch to the OFF position.
3. Connect the scan tool to the data link connector

(DLC).

4. Connect the scan tool’s power cord to the cigar

lighter socket.

5. Select immobilizer mode on the scan tool.
6. Turn the ignition ON, but do not start the engine.
Is communication established between the scan tool
and the immobilizer control unit?

–

Go to Step 2

Go to

“Communi-

cation

Between

Immobilizer

and Test

Equipment”

2

Read the IMMO & ECM ID

 

CODE message that

was displayed after requesting DIAGNOSIS.
Did the message differ from normal message?
Normal Message – ECM MODE: LEARNT

IMMO. MODE: LEARNT
VIN CODE: SAME

–

Go to

“Identification

(ID) Code

Repro-

gramming”

Go to Step 3

3

Check for an open serial data wire between the
immobilizer control unit and the ECM.
Was the circuit open?

–

Go to Step 4

Go to Step 5

4

Repair the open serial data wire between the ECM
and the immobilizer control unit.
Is the repair complete?

–

System OK

–

5

1. Replace the immobilizer.
2. Reprogram the identification (ID) code. Refer to

“Identification (ID) Code Reprogramming” in this
section.

Is the repair complete?

–

System OK

–

Go to Step 6

6

1. Replace the ECM.
2. Turn the ignition ON, OFF for more than 4

seconds.

3. Turn the ignition ON.
Is the repair complete?

–

System OK

–

9T – 22  IMMOBILIZER ANTI-THEFT SYSTEM

DAEWOO M–150 BL2

D209T002

DIAGNOSTIC TROUBLE CODE (P) 1629 (SIRIUS D3)

ECM IMMOBILIZER ERROR (INCORRECT ANSWER)

Circuit Description

When the ignition is turned ON, the key is tested by the
immobilizer anti-theft system. While the key code is be-
ing read by the immobilizer control unit, the engine can
start and run with any key that will turn the lock cylinder.
The key code is read and compared with key codes that
have been stored in the memory of the immobilizer con-
trol unit. If a valid key is detected, the immobilizer control
unit sends a serial data release message to the elec-
tronic control module (ECM). Included in the release
message is an identification (ID) code which assures
that neither the immobilizer control unit nor the ECM has

been substituted to defeat the system. If the ECM re-
ceives an invalid release message, the ECM performs
the following actions:

D

Disables the fuel injector circuit.

P 1629 Will Set When

D

The ECM receives an incorrect release message
from the immobilizer control unit more than five times.

P 1629 Will Clear When

D

The ignition switch is turned OFF or the scan tool
TROUBLE CODE CLEAR command is issued.

IMMOBILIZER ANTI-THEFT SYSTEM  9T – 23

DAEWOO M–150 BL2

P 1629 – ECM Immobilizer Error (Incorrect Answer)

Step

Action

Value

Yes

No

1

Connect the scan tool using the following procedure:
1. Insert the cartridge into the scan tool.
2. Turn the ignition switch to the OFF.
3. Connect the scan tool to the data link connector

(DLC).

4. Connect the scan tool’s power cord to the cigar

lighter socket.

5. Turn the ignition ON, but do not start the engine.
Is communication established between the scan tool
and the immobilizer control unit?

–

Go to Step 2

Go to

“Communi-

cation

Between

Immobilizer

and Test

Equipment”

2

1. Select DIAGNOSIS from the scan tool menu.
2. Read the IMMO & ECM ID CODE (immobilization

and electronic control module identification code)
message.

Did the message differ from normal message?
Normal Message – ECM MODE: LEARNT

IMMO. MODE: LEARNT
VIN CODE: SAME

–

Go to

“Identification

(ID) Code

Repro-

gramming”

Go to Step 3

3

1. Replace the ECM.
2. Reprogram the ID code.
Is the repair complete?

–

System OK

–

Go to Step 4

4

1. Replace the ECM.
2. Turn the ignition ON, OFF for more than 4

seconds.

3. Turn the ignition ON.
Is the repair complete?

–

System OK

–