2003 DAEWOO MATIZ fuel

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:

Disables the fuel injector circuit.

Disables the fuel pump circuit.

Disables the ignition coil.
DTC 1601 Will Set When

The ECM receives an incorrect release message
from the immobilizer control unit more than five times.
DTC 1601 Will Clear When

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

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:

Disables the fuel injector circuit.

Disables the fuel pump circuit.

Disables the ignition coil.
DTC 1602 Will Set When

The immobilizer control unit does not learn and store
the codes of valid keys.
DTC 1602 Will Clear When

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

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:

Disables the fuel injector circuit.
P 1628 Will Set When

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

The above conditions are maintained until the ignition
is switched OFF.
P 1628 Will Clear When

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

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

Disables the fuel injector circuit.
P 1629 Will Set When

The ECM receives an incorrect release message
from the immobilizer control unit more than five times.
P 1629 Will Clear When

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