Daewoo Matiz (2003 year). Service manual - part 290

 

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Daewoo Matiz (2003 year). Service manual - part 290

 

 

9T – 16  IMMOBILIZER ANTI-THEFT SYSTEM

DAEWOO M–150 BL2

D19T002B

DIAGNOSTIC TROUBLE CODE (DTC) 1601

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.

D

Disables the fuel pump circuit.

D

Disables the ignition coil.

DTC 1601 Will Set When

D

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

DTC 1601 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 – 17

DAEWOO M–150 BL2

DTC 1601 – 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 CURRENT KEY STATUS from the scan

tool menu.

2. Read the STATUS OF CURRENT KEY message.
Does the KEY STATUS message indicate “KEY IS
WRONG”?

–

Go to “Key

Status Errors”

Go to Step 3

3

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 4

4

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

–

Go to Step 5

Go to Step 6

5

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

–

System OK

–

6

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

–

System OK

–

9T – 18  IMMOBILIZER ANTI-THEFT SYSTEM

DAEWOO M–150 BL2

D19T002B

DIAGNOSTIC TROUBLE CODE (DTC) 1602

ECM IMMOBILIZER ERROR (ECM LOCKED)

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.

D

Disables the fuel pump circuit.

D

Disables the ignition coil.

DTC 1602 Will Set When

D

The immobilizer control unit does not learn and store
the codes of valid keys.

DTC 1602 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 – 19

DAEWOO M–150 BL2

DTC 1602 – ECM Immobilizer Error (ECM Locked)

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 CURRENT KEY STATUS from the scan

tool menu.

2. Read the STATUS OF CURRENT KEY message.
Does the KEY STATUS message indicate “KEY IS
WRONG”?

–

Go to “Key

Status Errors”

Go to Step 3

3

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 4

4

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

–

Go to Step 5

Go to Step 6

5

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

–

System OK

–

6

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

–

System OK

–

 

 

 

 

 

 

 

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