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Immobilizer Control System Operation Description
1) Each ignition key has its own FIX CODE (FC) stored in memory. When the ignition switch is turned to ON (II)
position, Immobilizer Control Module reads the FC through its coil antenna from ignition key.
2) Immobilizer Control Module compares FC read in Step 1 and that registered in Immobilizer Control Module.
Then, it checks if they match.
3) ECM sends variable (generated randomly) to transponder via Immobilizer Control Module, and then ECM
calculates it with SECRET KEY CODE (SKC) stored in its memory according to specified algorithm.
On the other hand, transponder also calculates received variable with SKC stored in its memory by means
of same algorithm and sends back to ECM.
4) Only when ECM/transponder calculated values match, ECM keeps running engine.
If two calculated values do not match, ECM stops operation of injectors and ignitor to stop engine after about
1.8 seconds at the first time. After the second time, ECM does not let engine start. And, so it does when FIX
CODEs in Step 2 do not match.
Immobilizer Control System Wiring Circuit Diagram
BLK/YEL
3
2
2
2
1
1. Battery
2. Fuse
3. FI fuse (20 A)
4. Ignition switch
5. Main relay
General Description
5
BLK/RED
4
9
BLU/ORN
8
7
6
6. DOME RADIO fuse (15 A)
7. STOP fuse (15 A)
8. IG COIL fuse (15 A)
9. METER fuse (10 A)
10. Service vehicle soon (SVS) lamp
IMMOBILIZER CONTROL SYSTEM (Z13DT ENGINE MODEL) 8G3-3
E27-4
E27-5
E27-6
BRN/WHT
E27-80
10
GRY/RED
E27-77
E27-88
WHT/BLK
G50-7
GRY/RED
G50-2
G50-5
BLK/WHT
PNK
G50-9
G56-16
WHT/RED
G56-5
BLK/ORN
11. Data link connector (DLC)
12. Immobilizer Control Module
13. ECM
13
E21-1
BRN
E27-2
BRN
E27-3
BRN
12
G50-4
G50-6
BLU
BLK
11
G56-7
G56-4
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