Suzuki GRAND VITARA JB416, Service Manual

Page: 450 / 474

10C-12 Immobilizer Control System:
Troubleshooting
Step Action Yes No
1 Diagnostic Trouble Code (DTC) confirmation
1) Clear DTC(s) referring to “Diagnostic Trouble Code
(DTC) Clearance: in related manual”.
2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to “Diagnostic
Trouble Code (DTC) Check: in related manual”.
Is DTC P1621 still detected?
Go to Step 2. The troubleshooting is
completed.
2 Fuse check
1) Check if any related fuse is blown.
Is any fuse blown?
Replace blown fuse(s)
with new one(s). Go to Step 3.
3 Immobilizer control module (ICM) poor connection
check
1) Disconnect immobilizer control module (ICM) connector
“G24” referring to “Immobilizer Control Module (ICM)
Removal and Installation: in related manual”.
2) Check if wire connections are normal at immobilizer
control module (ICM) connector “G24”.
Is each wire connection normal?
Go to Step 4. Repair poor
connection(s).
4 ECM poor connection check
1) Disconnect ECM connector “E23” referring to “Engine
Control Module (ECM) Removal and Installation: in
Section 1C in related manual”.
2) Check if wire connections at “E23-13” and “E23-28” wire
terminals are normal.
Is each wire connection normal?
Go to Step 5. Repair poor
connection(s).
5 Check for open in power supply wire circuit
1) Connect immobilizer control module (ICM) connector
“G24” referring to “Immobilizer Control Module (ICM)
Removal and Installation: in related manual”.
2) With the ignition switch at ON position, check voltage
between “G24-1” wire terminal at immobilizer control
module (ICM) and body ground.
Is voltage about 12 V?
Go to Step 6. Repair open in power
supply wire circuit.
6 Check for open in ground wire circuit
1) With the ignition switch at ON position, check voltage
between “G24-2” wire terminal at immobilizer control
module (ICM) and body ground.
Is voltage 0?
Go to Step 7. Repair open in ground
wire circuit.
7 Check for open in communication wire circuit
1) Disconnect immobilizer control module (ICM) connector
“G24” referring to “Immobilizer Control Module (ICM)
Removal and Installation: in related manual”.
2) Disconnect ECM connector “E23” referring to “Engine
Control Module (ECM) Removal and Installation: in
Section 1C in related manual”.
3) Check resistance between “G24-3” wire terminal at
immobilizer control module (ICM) connector and “E23-
28” wire terminal at ECM connector.
Is resistance infinite?
Repair open in
communication wire
circuit. Go to Step 8.