2000 SUZUKI SWIFT Transmission Service Workshop Manual

IMMOBILIZER CONTROL SYSTEM 8G-11
TABLE B - IMMOBILIZER INDICATOR LAMP CHECK (IMMOBILIZER INDICA-
TOR LAMP REMAINS ON AFTER ENGINE STARTS)
WIRING DIAGRAM
INSPECTION
1. Main fuse 2. Main relay 3. ECM 4. Immobilizer indicator lamp
BRN/WHT
BLK/RED
BLK/WHT
PNKBLK
BLK/ORG
BLK/ORG
BLK/YEL
C42-2
C42-1
C42-3 C41-10
C41-5/6
G02-6
G02-12
4
1
2
3
Step Action Yes No
1 1) With ignition switch OFF, disconnect cou-
plers from ECM.
Does immobilizer indicator lamp turn ON at
ignition switch ON?“PNK” wire shorted to
ground circuit.Substitute a known-good
ECM and recheck.

8G-12 IMMOBILIZER CONTROL SYSTEM
TABLE C - DTC IS NOT OUTPUT FROM IMMOBILIZER CONTROL MODULE
WIRING DIAGRAM
INSPECTION
1. To ECM 2. Immobilizer control module 3. To #9-pin in DLC
BLK/RED
BLK/WHTBLK/WHT
BLK
2
1
3
YEL
BLK/YEL
G06-4
G06-3
G06-1G06-2
Step Action Yes No
1 Check voltage between G06-4 terminal
and body ground with ignition switch
turned ON. See Fig 1.
Is it 10 – 14 V?Go to Step 2.“BLK/RED” wire
open or short to
ground.
2 1) Disconnect coupler (1) at immobilizer
control module.
Is there continuity between coupler termi-
nal G06-1 and body ground? See Fig 2.Poor G06-4 or G06-1 connection
Poor #9-pin connection in DLC
Serial data line “YEL” open or short
to ground
If connections and line are OK, substi-
tute a known-good Immobilizer Con-
trol Module and recheck.
See NOTE below.“BLK” wire open.
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.

IMMOBILIZER CONTROL SYSTEM 8G-13
Fig. 1 for Step 1
Fig. 2 for Step 2
DTC11/32 TRANSPONDER CODE NOT MATCHED
DESCRIPTION
Immobilizer Control Module checks if Transponder code transmitted from ignition key and that registered in
Immobilizer Control Module match when ignition switch is ON. If they do not, DTC 11 and/or 32 are set.
INSPECTION
Register ignition key with built-in transponder by using SUZUKI scan tool and performing following steps.
1) Register Transponder code in Immobilizer Control Module by performing procedure described in “How To
Register Ignition Key”.
2) Turn ignition switch OFF, then turn it ON and check that DTC11 and/or 32 are not set.

8G-14 IMMOBILIZER CONTROL SYSTEM
DTC31 TRANSPONDER CODE NOT REGISTERED
DESCRIPTION
Immobilizer Control Module checks if Transponder code transmitted from ignition key and that registered in
Immobilizer Control Module match when ignition switch is ON. If there is no Transponder code registered in
Immobilizer Control Module, this DTC is set.
INSPECTION
Register ignition key with built-in transponder by using SUZUKI scan tool and performing following steps.
1) Register Transponder code in Immobilizer Control Module by performing procedure described in “How To
Register Ignition Key”.
2) Turn ignition switch OFF, then turn it ON and check that DTC31 is not set.
DTC12 FAULT IN IMMOBILIZER CONTROL MODULE
DESCRIPTION
This DTC is set when an internal fault is detected in Immobilizer Control Module.
INSPECTION
Step Action Yes No
1 1) Ignition switch OFF.
2) Disconnect connectors from Immobilizer
Control Module.
3) Check for proper connection to Immobilizer
Control Module at all terminals.
Are they in good condition?Substitute a known-good
Immobilizer Control Module
and recheck.
See NOTE below.Repair or replace.
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.

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.