ignition SUZUKI SWIFT 2000 1.G Transmission Service Repair Manual

8G-4 IMMOBILIZER CONTROL SYSTEM
ON-BOARD DIAGNOSTIC SYSTEM
(SELF-DIAGNOSIS FUNCTION)
Immobilizer Control Module and ECM diagnose troubles which
may occur in the area including the following parts when the igni-
tion switch is ON.
ECM :
ECM/Immobilizer Control Module code
Serial data link circuit
ECM
Immobilizer Control Module :
Transponder code
Coil antenna
ECM/Immobilizer Control Module code
Serial data link circuit
Immobilizer Control Module
Ignition signal
With the ignition switch turned ON (but the engine at stop) regard-
less of the condition of the engine and emission control system,
ECM indicates whether a trouble has occurred in the immobilizer
control system or not by causing the immobilizer indicator lamp to
flash or turn ON.
Immobilizer indicator lamp is ON :
No trouble exists in the immobilizer control system.
Immobilizer indicator lamp is flashing :
ECM or Immobilizer Control Module has detected some trouble in
the immobilizer control system.
When ECM and Immobilizer Control Module detects a trouble, it
stores DTC corresponding to the exact trouble area in ECM and
Immobilizer Control Module memory.
DTCs stored in memory of each controller (Immobilizer Control
Module and ECM) can be read by using the procedure described
in “DIAGNOSTIC TROUBLE CODE CHECK (IMMOBILIZER
CONTROL MODULE)” and “DIAGNOSTIC TROUBLE CODE
CHECK(ECM)” in this section. NOTE:
As soon as the ignition switch is turned ON, ECM and
Immobilizer Control Module diagnose if a trouble has
occurred in the immobilizer control system. While the
diagnosis is being made, the immobilizer indicator lamp
stays ON and if the diagnosis result is “abnormal”, it
immediately changes to flashing but if the result is “nor-
mal”, it remains ON. Diagnosis takes about 3 seconds at
maximum.

IMMOBILIZER CONTROL SYSTEM 8G-5
DIAGNOSIS
PRECAUTIONS IN DIAGNOSING TROUBLES
PRECAUTIONS IN IDENTIFYING DIAGNOSTIC TROUBLE CODE
ECM
Before identifying diagnostic trouble code indicated through Suzuki scan tool, don't disconnect couplers from
ECM, battery cable from battery, ECM ground wire harness from engine.
Such disconnection will clear trouble codes for engine and emission control system and immobilizer control
system stored in memory of ECM.
Take a note of diagnostic trouble code indicated first.
IMMOBILIZER CONTROL MODULE
Take a note of diagnostic trouble code indicated first.
INTERMITTENT TROUBLES
There is case where Suzuki scan tool indicate a diagnostic trouble code representing a trouble which
occurred only temporarily and has gone. In such case, it may occur that good parts are replaced unneces-
sarily. To prevent such accident, be sure to follow instructions given below when checking by using “Diag-
nostic Flow Table”.
–When trouble can be identified, it is not an intermittent one :
Check coil antenna, ignition key, wires and each connection and if they are all in good condition, substi-
tute a known-good ECM and recheck.
–When trouble can not be identified but Suzuki scan tool indicate a trouble code :
Diagnose trouble by using that code No. and if ignition key, coil antenna, wires and each connection are
all in good condition, turn OFF ignition switch and then ON.
Then check what Suzuki scan tool indicate.Only when they indicate trouble code again, substitute a known-
good ECM or Immobilizer Control Module and check again.
If they indicate not trouble code but normal code, it means that an intermittent trouble did occur and has gone. In
this case, check wires and connections carefully again.

IMMOBILIZER CONTROL SYSTEM 8G-7
DIAGNOSTIC TROUBLE CODE (DTC) CHECK
(IMMOBILIZER CONTROL MODULE)
1) Turn ignition switch OFF.
2) After setting cartridge to Suzuki scan tool, connect it to data
link connector (DLC) (1) located on underside of instrument
panel at driver’s seat side.
Special tool
(A) : 09931-76011 (Suzuki scan tool)
(B) : Mass storage cartridge
(C) : 09931-76030 (16/14 pin DLC cable)
3) Turn ignition switch ON.
4) Read DTC stored in immobilizer control module according to
instructions displayed on Suzuki scan tool and print it or
write it down. Refer to Suzuki scan tool operator's manual for
further details.
If communication between Suzuki scan tool and immobilizer
control module is not possible, go to “Diagnostic Flow Table
C”.
5) After completing the check, turn ignition switch OFF and dis-
connect Suzuki scan tool from data link connector (DLC). NOTE:
When reading DTC stored in immobilizer control module
using Suzuki scan tool, select “BCM” from the applica-
tions menu and “IMMOBILIZER” from the select system
menu displayed on Suzuki scan tool.
1
(C)(A)
(B)

8G-8 IMMOBILIZER CONTROL SYSTEM
DIAGNOSTIC TROUBLE CODE (DTC) CHECK
(ECM)
1) Turn ignition switch OFF.
2) After setting cartridge to Suzuki scan tool, connect it to data
link connector (DLC) (1) located on underside of instrument
panel at driver’s seat side.
Special tool
(A) : 09931-76011 (Suzuki scan tool)
(B) : Mass storage cartridge
(C) : 09931-76030 (16/14 pin DLC cable)
3) Turn ignition switch ON.
4) Read DTC stored in ECM according to instructions displayed
on Suzuki scan tool and print it or write it down. Refer to
Suzuki scan tool operator’s manual for further details.
If communication between Suzuki scan tool and ECM is not
possible, check if Suzuki scan tool is communicable by con-
necting it to ECM in another vehicle. If communication is
possible in this case, Suzuki scan tool is in good condition.
Then check data link connector and serial data line (circuit)
in the vehicle with which communication was not possible.
5) After completing the check, turn ignition switch OFF and dis-
connect Suzuki scan tool from data link connector (DLC). NOTE:
When reading DTC stored in ECM using Suzuki scan
tool, select “ECM” from the applications menu and
“SUZUKI mode” from the communication mode menu
displayed on Suzuki scan tool.
If ECM detects a trouble in both engine and emission
control system and immobilizer control system, Suzuki
scan tool indicates trouble codes of both systems
using Suzuki mode of ECM application.
1
(C)(A)
(B)

IMMOBILIZER CONTROL SYSTEM 8G-9
DIAGNOSTIC TROUBLE CODE TABLE
IMMOBILIZER CONTROL MODULE
ECM
DTC
(indicated on Suzuki scan tool)DIAGNOSTIC AREA DIAGNOSIS
NO DTC Normal (No code)This code appears when none of
the other codes are identified.
11
Transponder code
Diagnose trouble according to
“Diagnostic Flow Table” corre-
sponding to each code No. 31
32
12 Immobilizer Control Module
13 Coil antenna or ignition key with
built-in transponder
21 ECM/Immobilizer Control Module
code
22 Ignition switch circuit
23 Serial data link circuit
DTC
(indicated on Suzuki scan tool)DIAGNOSTIC AREA DIAGNOSIS
NO DTC NormalThis code appears when it is con-
firmed that none of other trouble
codes is set for immobilizer control
system or engine and emission
control system.
P1623 ECM/Immobilizer Control Module
codeDiagnose trouble according to
“DIAGNOSTIC FLOW TABLE” cor-
responding to each code No. P1620
P1622 ECM
P1621 Serial data link wire

8G-10 IMMOBILIZER CONTROL SYSTEM
TABLE A - IMMOBILIZER INDICATOR LAMP CHECK (IMMOBILIZER INDICA-
TOR LAMP DOES NOT LIGHT AT IGNITION SWITCH ON)
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) Turn ignition switch ON.
Do other indicator/warning lights in combination
meter come ON?Go to Step 2.“IG” fuse blown, main fuse
blown, ignition switch mal-
function, “BLK/WHT” circuit
between “IG” fuse and com-
bination meter or poor cou-
pler connection at
combination meter.
2 1) Turn ignition switch OFF and disconnect
connectors from ECM.
2) Check for proper connection to ECM at ter-
minal G02-12.
3) If OK, then using service wire, ground termi-
nal G02-12 in connector disconnected.
Does immobilizer indicator lamp turn on at igni-
tion switch ON?Substitute a known-
good ECM and
recheck.Bulb burned out or “PNK”
wire circuit open.

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.