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IMMOBILIZER CONTROL SYSTEM (Z13DT ENGINE MODEL) 8G3-5
ECM
As main function other than engine control, ECM (1) sends ran-
domized data to transponder and checks if a response from tran-
sponder and the value calculated in ECM match.
According to matching result, ECM decides to keep engine run-
ning or not.
ECM has 2 different values as follows.
• Password (PWD): for accessing to program immobilizer con-
trol system.
• SECRET KEY CODE (SKC): for calculating with this value
for permission of engine start.
Data Link Connector (DLC)
DLC (1) is in compliance with SAE J1962 in its installation posi-
tion, the shape of connector and pin assignment.
OBD-II serial data line (K line of ISO 9141) (2) is used for SUZUKI
scan tool to communicate with Immobilizer Control Module, Air
bag SDM, ABS control module, etc.
3. B+
4. ECM ground
5. Body ground
On-Board Diagnostic System Description
ECM and Immobilizer Control Module diagnose troubles which
may occur in the area including the following parts when the igni-
tion switch is turned to ON position.
Immobilizer Control Module
• W-line (communication line between ECM and Immobilizer
Control Module)
• Password (PWD)
• MIL circuit
• Transponder (ignition key)
• FIX CODE (FC)
ECM
• SECRET KEY CODE (SKC)
• PWD
When a trouble exists in the immobilizer control system (when
Immobilizer Control Module or ECM detects a diagnostic trouble
code (DTC)), ECM stops operation of the injector and igniter.
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