2000 SUZUKI SWIFT immobilizer

IMMOBILIZER CONTROL SYSTEM 8G-15
DTC13 NO TRANSPONDER CODE TRANSMITTED OR COIL ANTENNA
OPENED/SHORTED
DESCRIPTION
Immobilizer Control Module energizes the coil antenna when the ignition switch is ON and reads Transponder
code from the ignition key. When Immobilizer Control Module cannot read Transponder code from the ignition
key even when the coil antenna is energized, this DTC is set.
INSPECTION
Fig. 1 for Step 1
1. Main fuse 2. Main relay 3. Immobilizer Control Module 4. Coil antenna 5. To ECM
BLK/RED
BLK/YEL
G06-4
2
3
4 5
1
Step Action Yes No
1 Check that knob shape and color for igni-
tion key are as shown below.
Knob color : Dark gray
Knob shape : the same as shown in
Fig.1.
Is it the original one?Substitute a known-good Immobilizer
Control Module and recheck.
See NOTE below.Replace ignition
key with original
one and follow
“Diagnostic Flow
Table” again.
NOTE:
After replacing with a known-good Immobilizer Control Module, register ECM/Immobilizer Control
Module code in ECM and Transponder code and ECM/Immobilizer Control Module code in Immobilizer
Control Module by performing procedure described in “PROCEDURE AFTER IMMOBILIZER CON-
TROL MODULE REPLACEMENT” in this section.

8G-16 IMMOBILIZER CONTROL SYSTEM
DTC21 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED (IMMO-
BILIZER CONTROL MODULE SIDE)
DTC P1623 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED
(ECM SIDE)
DTC P1620 ECM/IMMOBILIZER CONTROL MODULE CODE NOT REGISTERED
DESCRIPTION
DTC21
Immobilizer Control Module checks if ECM/Immobilizer Control Module code transmitted from ECM and that
registered in Immobilizer Control Module match when ignition switch is ON. If they do not, this DTC is set.
DTC P1623
ECM checks if ECM/Immobilizer Control Module code transmitted from Immobilizer Control Module and that
registered in ECM match when ignition switch is ON. If they do not, this DTC is set.
DTC P1620
ECM checks if code transmitted from Immobilizer Control Module and that registered in ECM match when
ignition switch is ON. If there is no ECM/Immobilizer Control Module code registered in ECM, this DTC is
set.
INSPECTION
Perform procedure described in “PROCEDURE AFTER ECM REPLACEMENT” in the section.
DTC P1622 FAULT IN ECM
DESCRIPTION
This DTC is set when an internal fault is detected in ECM.
INSPECTION
Step Action Yes No
1 1) Ignition switch OFF.
2) Disconnect connectors from ECM.
3) Check for proper connection to ECM
at all terminals.
Are they in good condition?Substitute a known-good ECM and
recheck.
See NOTE below.Repair or replace.
NOTE:
After replacing with a known-good ECM, register ECM/Immobilizer Control Module code in ECM by
performing procedure described in “PROCEDURE AFTER ECM REPLACEMENT” in this section.

IMMOBILIZER CONTROL SYSTEM 8G-17
DTC22 IGNITION SWITCH CIRCUIT OPEN/SHORT
DESCRIPTION
Immobilizer Control Module monitors ignition signal when the ignition switch is ON. This DTC is set when no
ignition signal input is detected by Immobilizer Control Module.
INSPECTION
Fig. 1 for Step 1
1. Main fuse 2. Ignition switch 3. Immobilizer Control Module
BLK/WHTBLK/WHTG06-3
12
3
Step Action Yes No
1 Check voltage between Immobilizer Con-
trol Module (1) coupler terminal G06-3
and body ground with ignition switch
turned ON. (See Fig. 1)
Is it 10 – 14V?Poor G06-3 terminal connection.
If connection is OK, substitute a
known-good Immobilizer Control Mod-
ule and recheck.
See NOTE below.“BLK/WHT” wire
open or short.
NOTE:
After replacing with a known-good Immobilizer Control Module, register ECM/Immobilizer Control
Module code in ECM and Transponder code and ECM/Immobilizer Control Module code in Immobilizer
Control Module by performing procedure described in “PROCEDURE AFTER IMMOBILIZER CON-
TROL MODULE REPLACEMENT” in this section.

8G-18 IMMOBILIZER CONTROL SYSTEM
DTC23 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
FROM ECM OR DLC CIRCUIT OPENED/SHORTED
DTC P1621 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
FROM IMMOBILIZER CONTROL MODULE OR DLC CIRCUIT OPENED/
SHORTED
DESCRIPTION
When the ignition switch is ON, Immobilizer Control Module requests ECM and ECM requests Immobilizer Con-
trol Module to transmit ECM/Immobilizer Control Module code. If ECM/Immobilizer Control Module code is not
transmitted from ECM or Immobilizer Control Module, Immobilizer Control Module sets DTC23 and ECM sets
DTC P1621.
INSPECTION
1. Immobilizer Control Module 2. ECM 3. To #9-pin in DLC
YEL G06-2G02-7YEL
YEL
1
32
Step Action Yes No
1 Check voltage between Immobilizer Con-
trol Module (1) coupler terminal G06-2
and body ground with ignition switch
turned ON.
Is it 4 – 5V?Go to Step 2.“YEL” wire short.
2 1) Disconnect ECM coupler with ignition
switch turned OFF.
2) Is there continuity between Immobi-
lizer Control Module coupler (1) termi-
nal G06-2 and serial data link terminal
(G02-7) of ECM coupler? (For posi-
tions of Data link connector terminal
of ECM coupler, refer to “WIRING
CIRCUIT” in this section.)Poor G06-2 terminal connection
(Immobilizer Control Module) or Poor
Data link connector terminal connec-
tion (ECM).
If connections are OK, substitute a
known-good ECM or Immobilizer Con-
trol Module and recheck.
See NOTE below.“YEL” wire between
Immobilizer Control
Module and ECM
open.

IMMOBILIZER CONTROL SYSTEM 8G-19
Fig. 1 for Step 1
Fig. 2 for Step 2NOTE:
After replacing with a known-good ECM, register ECM/Immobilizer Control Module code in ECM by
performing procedure described in “PROCEDURE AFTER ECM REPLACEMENT” in this section.
After replacing with a known-good Immobilizer Control Module, register ECM/Immobilizer Control
Module code in ECM and Transponder code and ECM/Immobilizer Control Module code in Immobi-
lizer Control Module by performing procedure described in “PROCEDURE AFTER IMMOBILIZER
CONTROL MODULE REPLACEMENT” in the section.
2. Connect to serial data link terminal (G02-7) of ECM coupler disconnected

8G-20 IMMOBILIZER CONTROL SYSTEM
INSPECTION OF ECM, IMMOBILIZER CON-
TROL MODULE AND ITS CIRCUIT
ECM, Immobilizer Control Module and its circuit can be checked
at ECM wiring couplers and Immobilizer Control Module wiring
coupler by measuring voltage. Described here is only inspection
of Immobilizer Control Module. For inspection of ECM, refer to
“ENGINE & EMISSION CONTROL INPUT/OUTPUT TABLE” in
Section 6E1.
Voltage Check
1) Remove Immobilizer Control Module from steering lock
assembly with ignition switch OFF, referring to “REMOVAL”
of “IMMOBILIZER CONTROL MODULE” in this section.
2) Connect Immobilizer Control Module coupler to Immobilizer
Control Module.
3) Check voltage at each terminal of coupler connected.CAUTION:
Immobilizer Control Module cannot be checked by itself.
It is strictly prohibited to connect voltmeter or ohmmeter
to Immobilizer Control Module with coupler disconnected
from it.
NOTE:
As each terminal voltage is affected by the battery volt-
age, confirm that it is 11V or more when ignition switch is
ON.
1. Immobilizer Control Module
2. Immobilizer Control Module coupler
3. Body ground
TERMINAL CIRCUIT NOMAL VOLTAGE CONDITION
G06-1 Ground––
G06-2Data link connector
(Serial data terminal)4 – 5V Ignition switch ON
G06-3 Ignition signal10 – 14V Ignition switch ON
0 – 0.8V Ignition switch OFF
G06-4 Power source 10 – 14V Ignition switch ON

IMMOBILIZER CONTROL SYSTEM 8G-21
ON-VEHICLE SERVICE
PRECAUTIONS IN HANDLING IMMOBILIZER
CONTROL SYSTEM
Don’t turn ON ignition switch with ignition key for immobilizer
control system put together with another one or placed quite
close to another one. Or the system may detect abnormal
condition and prevent engine from starting.
Do not turn ON ignition switch by using ignition key with any
type of metal wound around its grip or in contact with it. Or
the system may detect abnormal condition and prevent
engine from starting.
Do not leave ignition key where high temperature is antici-
pated.High temperature will cause transponder in ignition
key to be abnormal or damaged.

8G-22 IMMOBILIZER CONTROL SYSTEM
Do not turn ON ignition switch with a radio antenna placed
near Immobilizer Control Module. Or the system may detect
abnormal condition and prevent engine from starting.
IMMOBILIZER CONTROL MODULE
REMOBAL
1) Disconnect negative (–) cable at battery.
2) Remove steering column upper and lower cover.
3) Disconnect coupler at Immobilizer Control Module.
4) Remove immobilizer control module (1) from steering lock
assembly (2) after removing instrument cluster panel.
INSTALLATION
Reverse removal procedure for installation.
NOTE:
If a screwdriver whose length is 40mm or less is used,
the immobilizer control module can be removed without
removing the instrument cluster panel.
NOTE:
After replacing Immobilizer Control Module, be sure to
register Transponder code and ECM/Immobilizer Control
Module code in Immobilizer Control Module and ECM/
Immobilizer Control Module code in ECM by performing
procedure described in “PROCEDURE AFTER IMMOBI-
LIZER CONTROL MODULE REPLACEMENT” in this sec-
tion.