Daewoo NUBIRA, User Manual

Page: 3 / 685

9T – 2 I IMMOBILIZER ANTI–THEFT SYSTEM
DAEWOO V–121 BL4
DIAGNOSIS
IMMOBILIZERANTI–THEFT SYSTEM
The immobilizer anti–theft system requires diagnosis
when it is not possible to start the engine. If the no–start
condition occurs because of the immobilizer system, a
diagnostic trouble code (DTC) 53 should be set.
The immobilizer anti–theft system requires diagnosis
when it is not possible to start the engine. If the no–start
condition occurs because of the immobilizer system, a
diagnostic trouble code (DTC) 53 should be set.
Unauthorized use of a scan tool could be a method of de-
feating the immobilizer anti–theft system. Therefore, cer-
tain scan tool procedures require the use of a password.
The following functions are password protected:
S
Coding of an additional key.
S
Deleting all key codes.
S
Deletion of the immobilizer identification (ID) code.
S
Deletion of the powertrain control module
(PCM)/engine control module (ECM) ID code.
The following functions do not require a password:
S
Reading an ignition key to determine if the trans-
ponder is working or if a key is authorized.
S
Reading the immobilizer ID code to verify that it
matches the PCM/ECM ID code.
DTC 53 – PCM/ECM Immobilized Error
Step Action Value(s) Yes No
1 Connect the scan tool using the following procedure:
1. Insert the immobilizer data cartridge into the
scan tool.
2. Turn the ignition OFF.
3. Connect the scan tool to the data link connec-
tor DLC).
4. Turn the ignition ON, but do not start the en-
gine.
Is communication established between the scan tool
and the immobilizer control unit?
Go to Step 2 Go to ”Commu-
nication Be-
tween Immobi-
lizer and Test
Equipment”
2 Select SYSTEM DIAGNOSIS from the scan tool
menu.
Does the KEY STATUS message indicate POS NR
(position number) 00? Go to ’Key
Status Errors”
Go to Step 3
3 Read the IMMO & PCM/ECM ID–CODE message
that is displayed after requesting SYSTEM DIAG-
NOSIS.
Does the message ID–CODE DIFFERENT appear? Go to ”ID
Code Repro-
gramming”
Go to Step 4
4 Check for an open serial data wire between the im-
mobilizer control unit and the powertrain control
module (PCM)/engine control module (ECM).
Is the circuit open? Go to Step 5 Go to Step 6
5 Repair the open serial data wire between the PCM/
ECM and the immobilizer control unit.
Is the repair complete? System OK
6
1. Replace the ECM.
2. Reprogram the identification (ID) code. Refer
to”ID Code Reprogramming” in this section.
Is the repair complete?
System OK
KEY STATUS ERRORS
The following KEY STATUS messages may be shown on
the scan tool after commanding SYSTEM DIAGNOSIS:
S
IGNITION OFF STATUS. This message informs
the technician that the ignition is OFF during the
key coding process. Turn the ignition ON during key
coding, but do not start the engine.