immobilizer control system SUZUKI GRAND VITARA 2000 2.G Service User Guide

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-7
[INTERMITTENT TROUBLES]
<Vehicle equipped with monitor coupler>

There are cases where output of diagnostic output terminal
and / or malfunction indicator lamp 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
unnecessarily. To prevent such accident, be sure to follow instruc-
tions given below when checking by using ªDiagnostic Flow
Tableº.
* 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, substitute a known-good
ECM / PCM and recheck.
* When trouble can not be identified but output of diagnostic out-
put terminal and / or malfunction indicator lamp 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 malfunction indicator lamp and / or output of diag-
nostic output terminal indicate.
Only when they indicate trouble code again, substitute a known-
good ECM / PCM 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.
<Vehicle not equipped with monitor coupler>

There are cases where output of diagnostic output terminal and/
or Suzuki scan tool indicates a diagnostic trouble code represent-
ing a trouble which occurred only temporarily and has gone. In
such case, it may occur that good parts are replaced unnecessar-
ily. To prevent such accident, be sure to follow instructions given
below when checking by using ªDiagnostic Flow Tableº.
* 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, substitute a known-good
ECM / PCM and recheck.
* When trouble can not be identified but output of diagnostic out-
put terminal and/or Suzuki scan tool indicates 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 and/or output of diagnostic out-
put terminal indicates.
Only when they indicate trouble code again, substitute a known-
good ECM / PCM 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.

YH4
GRAND
VITARA
8G-8 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
[NOTES ON SYSTEM CIRCUIT INSPECTION]
Refer to ªPrecautions for Electrical Circuit Serviceº and ªIntermit-
tents and Poor Connectionº in Section 0A.
[Precaution after replacing ECM / PCM or Immobilizer Control Mod-
ule]

When ECM / PCM was replaced, including when replaced be-
cause rechecking by using a known-good ECM / PCM was neces-
sary during trouble diagnosis, the ECM/Immobilizer Control Mod-
ule code must be registered in ECM / PCM and Immobilizer
Control Module by performing procedure described in ªProce-
dure after ECM / PCM Replacementº on p. 8G-27. If it is not regis-
tered, the engine would not start and accurate trouble diagnosis
would not be assured.

When Immobilizer Control Module was replaced, including when
replaced because rechecking by using a known-good Immobiliz-
er Control Module was necessary during trouble diagnosis, the
Transponder code and ECM/Immobilizer Control Module code
must be registered in Immobilizer Control Module and ECM/Im-
mobilizer Control Module code in ECM / PCM by performing pro-
cedure described in ªProcedure after Immobilizer Control Module
Replacementº on p. 8G-26. If they are not registered, the engine
would not start and accurate trouble diagnosis would not be as-
sured.

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-9
Fig. 1 for Step 1 Fig. 2 for Step 1 Fig. 3 for Step 2
1. Monitor coupler
2. Service wire
A: Diagnosis switch terminal
B: Ground terminal
Fig. 4 for Step 3
ªCHECK ENGINEº light
0.5
ON
OFF
TIME (sec.)
DIAGNOSTIC FLOW TABLE
<Vehicle equipped with monitor coupler>
STEPACTIONYESNO
11) Make sure that diagnosis switch
terminal in monitor coupler is not
grounded by service wire. See Fig. 1.
2) Check malfunction indicator lamp
while ignition switch is ON (but without
starting engine). See Fig. 2.
Dose malfunction indicator lamp flash?Go to Step 3.
If malfunction indicator lamp
remains ON, go to Step 2.

If malfunction indicator lamp
remains OFF, go to
ªMALFUNCTION INDICATOR
LAMP CHECKº in Section 6.
21) Using service wire, ground diagnosis
switch terminal in monitor coupler.
See Fig. 3.
Dose malfunction indicator lamp flash?Immobilizer control
system is in good
condition.Go to ªMALFUNCTION
INDICATOR LAMP CHECKº in
Section 6.
3Dose malfunction indicator lamp flash as
Fig. 4?Go to Step 4.Go to ªMALFUNCTION
INDICATOR LAMP CHECKº in
Section 6.
41) Check DTC stored in immobilizer
control module referring to
ªDIAGNOSTIC TROUBLE CODE
CHECK (IMMOBILIZER CONTROL
MODULE)º in this section.
Is there any DTC(s)?Go to flow table for
DTC No.Go to Step 5.
51) Check DTC stored in ECM/PCM
referring to ªDIAGNOSTIC TROUBLE
CODE CHECK (ECM / PCM)º in this
section.
Is there any DTC(s)?Go to flow table for
DTC No.Substitute a known-good ECM/
PCM and recheck.
NOTE:
After replacing with a known-
good ECM/PCM, register
ECM / Immobilizer Control
Module code in ECM/PCM by
performing procedure described
in ªProcedure after ECM/PCM
Replacementº section.

YH4
GRAND
VITARA
8G-10 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
DIAGNOSTIC FLOW TABLE
<Vehicle not equipped with monitor coupler>
STEPACTIONYESNO
11) Check immobilizer indicator lamp
while ignition switch is ON (but without
starting engine). See Fig. 1.
Dose immobilizer indicator lamp flash?Go to Step 3.
If immobilizer indicator lamp
remains ON, go to Step 2.

If immobilizer indicator lamp
remains OFF, go to
ªIMMOBILIZER INDICATOR
LAMP CHECKº in this section.
21) Check DTC stored in ECM / PCM
referring to ªDIAGNOSTIC TROUBLE
CODE CHECK (ECM / PCM)º in this
section.
Is there any DTC(s)?Go to ªIMMOBILIZER
INDICATOR LAMP
CHECKº in this section.Immobilizer control system is in
good condition.
31) Check DTC stored in immobilizer
control module referring to
ªDIAGNOSTIC TROUBLE CODE
CHECK (IMMOBILIZER CONTROL
MODULE)º in this section.
Is there any DTC(s)?Go to flow table for
DTC No.Go to Step 4.
41) Check DTC stored in ECM / PCM
referring to ªDIAGNOSTIC TROUBLE
CODE CHECK (ECM / PCM)º in this
section.
Is there any DTC(s) for immobilizer
control system?Go to flow table for
DTC No.Substitute a known-good ECM /
PCM and recheck.
NOTE:
After replacing with a known-
good ECM / PCM, register
ECM / Immobilizer Control
Module code in ECM / PCM by
performing procedure described
in ªProcedure after ECM / PCM
Replacementº section.
FIg. 1 for Step 1

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-11
1. Immobilizer diagnostic coupler
EXAMPLE :
COIL ANTENNA FAILURE (CODE NO.13)
Voltmeter indicator

NORMAL (No code)
Voltmeter indicatorTIME (sec.)
TIME (sec.) CODE No. 13CODE No. 13CODE No. 13
High
Low
High
Low
1. Monitor coupler
2. Service wire
A: Diagnosis switch
terminal
B: Ground terminal
DIAGNOSTIC TROUBLE CODE (DTC) CHECK
(IMMOBILIZER CONTROL MODULE)
1) Using analog type voltmeter, connect positive probe to diagnos-
tic output terminal and negative probe to ground of immobilizer
diagnostic coupler with ignition switch turned ON.
2) Read deflection of voltmeter indicator which represents DTC as
shown in example below and write it down. For details of DTC,
refer to Immobilizer Control Module side in ªDiagnostic Trouble
Code Tableº.
If voltmeter indicator dose not deflect, go to ªDiagnostic Flow
Table Aº.
NOTE:
If abnormality or malfunction lies in two or more areas, volt-
meter indicates applicable codes three times each.
DIAGNOSTIC TROUBLE CODE (DTC) CHECK (ECM/PCM)
[Not using SUZUKI scan tool] (Vehicle equipped with
monitor coupler)
1) Using service wire, ground diagnostic switch terminal in monitor
coupler.
2) Read DTC from flashing pattern of malfunction indicator lamp as
shown in example below and write it down. For details of DTC,
refer to ECM / PCM side in ªDiagnostic Trouble Code Tableº.
If lamp remains ON, go to ªMalfunction Indicator Lamp Checkº
in Section 6.
NOTE:
If abnormality or malfunction lies in two or more areas, mal-
function indicator lamp indicates applicable codes three
times each.
And flashing of these codes is repeated as long as diagno-
sis terminal is grounded and ignition switch is held at ON
position.

YH4
GRAND
VITARA
8G-12 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
EXAMPLE: When serial data link wire is defective (Code No.83)
ON
OFFMalfunction
indicator lamp
Code No.83 Code No.83 Code No.83
Time (sec.)
1. Data link connector (DLC)
3) After completing the check, turn ignition switch OFF and discon-
nect service wire from monitor coupler.
[Using SUZUKI scan tool]
1) Turn ignition switch OFF.
2) After setting cartridge to Suzuki scan tool, connect it to data link
connector (DLC) 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 / 12 pin DLC adapter)
3) Turn ignition switch ON.
4) Read DTC according to instructions displayed on Suzuki scan
tool and print it or write it down. Refer to Suzuki scan tool opera-
tor's manual for further details.
NOTE:

When reading DTC stored in ECM / PCM using Suzuki scan
tool, select ªECMº from the applications menu and ªSU-
ZUKI modeº from the communication mode menu dis-
played on Suzuki scan tool.

If ECM / PCM detects a trouble in both electric fuel injec-
tion system and immobilizer control system, Suzuki scan
tool indicates trouble codes of both systems using Suzu-
ki mode of ECM application.
If communication between Suzuki scan tool and ECM / PCM is
not possible, check if Suzuki scan tool is communicable by con-
necting it to ECM / PCM 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 ve-
hicle with which communication was not possible.
5) After completing the check, turn ignition switch OFF and discon-
nect Suzuki scan tool from data link connector (DLC).

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-13
DIAGNOSTIC TROUBLE CODE TABLE
Immobilizer Control Module side
DIAGNOSTIC TROUBLE CODEDIAGNOSTIC AREADIAGNOSISNO.VOLTMETER INDICATIONDIAGNOSTIC AREADIAGNOSIS
±Normal (No code)This code appears when none of the
other codes are identified.
11
Transponder code
31
Trans onder code
12Immobilizer Control Module
Diagnose trouble according to
13Coil antenna or ignition key with
built-in transponderDiagnose trouble according to
ªDIAGNOSTIC FLOW TABLEº
corresponding to each code No.
21ECM/Immobilizer Control Module code
corres onding to each code No.
22Ignition switch circuit
23Serial data link wire
ECM / PCM side
DTC
(indicated on
Suzuki
scan tool)DTC
(indicated
by MIL)Malfunction Indicator lamp
(MIL) flashing patternDIAGNOSTIC AREADIAGNOSIS
NO DTC12Normal
This code appears when it is
confirmed that none of other
trouble codes is set for immo-
bilizer control system or elec-
tronic fuel injection system.
P162381ECM/Immobilizer
P162084Control Module codeDiagnose trouble according to
ªDIAGNOSTIC FLOW
P162282ECM / PCMTABLEº corresponding to
each code No.
P162183Serial data link wire

YH4
GRAND
VITARA
8G-14 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
In cabin
-1. Main fuse
-2. Main relay
-3. Immobilizer Control Module
-4. Immobilizer diagnostic coupler
4-1. Ground terminal
4-2. Diagnostic output terminal
-5. To ECM / PCM
TABLE A DTC IS NOT OUTPUT FROM DIAGNOSTIC OUTPUT TERMINAL
STEPACTIONYESNO
1Check voltage between A3 terminal
and body ground with ignition switch
turned ON.
Is it 10 ± 14V?Go to Step 2.ª(f)º wire open.
21) Connect voltmeter between A5
terminal and body ground.
2) Does voltmeter indicator deflect?Go to Step 3.
Poor A3, A5 or A7 connection.

ª(h)º wire of A7 terminal open.

ª(m)º wire between A5 terminal and
diagnostic output terminal of immobi-
lizer diagnostic coupler short.
If wire and connections are OK, substi-
tute a known-good Immobilizer Control
Module and recheck.
NOTE:
After replacing with a known-good
Immobilizer Control Module, register
ECM/Immobilizer Control Module
code in ECM / PCM and Transponder
code and ECM/Immobilizer Control
Module code in Immobilizer Control
Module by performing procedure
described in ªProcedure after Immo-
bilizer Control Module Replace-
mentº section.
31) Connect voltmeter between diag-
nostic output terminal of immobiliz-
er diagnostic coupler and body
ground.
2) Is it possible to read DTC by check-
ing deflection of voltmeter indicator?ª(n)º wire of ground
terminal for immo-
bilizer diagnostic
coupler open.ª(m)º wire between A5 terminal and diag-
nostic output terminal of immobilizer
diagnostic coupler open.

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-15
1. Main fuse
2. Main relay
3. ECM/PCM
4. Immobilizer indicator lamp
(Vehicle not equipped with
monitor coupler) For G16 / J20 engine For H25 engine
G16 / J20 Engine
H25 Engine
TABLE B IMMOBILIZER INDICATOR LAMP CHECK
(IMMOBILIZER INDICATOR LAMP DOSE NOT LIGHT AT IGNITION
SWITCH ON)
STEPACTIONYESNO
11) Turn ignition switch ON.
Do other indicator / warning lights in
combination meter come ON?Go to Step 2.ªIGº fuse blown, main fuse blown,
ignition switch malfunction,
ªB / Wº circuit between ªIGº fuse
and combination meter or poor
coupler connection at
combination meter.
21) Turn ignition switch OFF and
disconnect connectors from ECM /
PCM.
2) Check for proper connection to ECM /
PCM at terminal E61-5 for G16 / J20
engine or E61-23 for H25 engine.
3) If OK, then using service wire, ground
terminal E61-5 for G16 / J20 engine or
E61-23 for H25 engine in connector
disconnected.
Does immobilizer indicator lamp turn on
at ignition switch ON?Substitute a known-
good ECM / PCM and
recheck.Bulb burned out or ª(b)º wire
circuit open.

YH4
GRAND
VITARA
8G-16 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
1. Main fuse
2. Main relay
3. ECM / PCM
4. Immobilizer indicator lamp
(Vehicle not equipped with
monitor coupler) For G16 / J20 engine For H25 engine
G16 / J20 Engine
H25 Engine
TABLE C IMMOBILIZER INDICATOR LAMP CHECK
(IMMOBILIZER INDICATOR LAMP REMAINS ON AFTER ENGINE
STARTS)
STEPACTIONYESNO
11) With ignition switch OFF, disconnect
couplers from ECM / PCM.
Does immobilizer indicator lamp turn ON
at ignition switch ON?ª(p)º wire shorted to
ground circuit.Substitute a known-good ECM /
PCM and recheck.