Daewoo CIELO EURO III Manual page 528

1F – 358 ENGINE CONTROLS
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 anti-theft 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
have been substituted to defect the system. If the ECM
receives 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.
Conditions for Setting the DTC
D Ignition ON.
D ECM release time window expired.
1.5L SOHC
D Immobilizer option auto detected.
D Vehicle Speed Sensor (VSS) is less than 318 mph
(512 km/h).
DIAGNOSTIC TROUBLE CODE (DTC) P1626
IMMOBILIZER NO PASSWORD
Action Taken When the DTC Sets
D The Malfunction Indicator Lamp (MIL) will not illumi-
nate.
D The ECM will store conditions which were present
when the DTC set as Failure Records data only. This
information will not be stored as Freeze Frame data.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
D A history DTC will clear after 40 consecutive warm-up
cycles without a fault.
D The DTC(s) can be cleared by using the scan tool.
Test Description
The number(s) below refer to specific step(s) on the
diagnostic table.
1. On-Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
6. The replacement ECM must be reprogrammed. Re-
fer to the latest Techline procedure for ECM repro-
gramming.
TAA1F410
DAEWOO T-154 BL2,3