2000 SUZUKI GRAND VITARA ECM REPLACEMENT

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-21
12
3
1. Main fuse
2. Ignition switch
3. Immobilizer
Control Module (g)
A4
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:
STEPACTIONYESNO
1Check voltage between Immobilizer
Control Module coupler terminal A4
and body ground with ignition
switch turned ON.
(See Fig.1)
Is it 10 ± 14V?Poor A4 terminal connection.
If connection is OK, substitute a
known-good Immobilizer Control
Module and recheck.
NOTE:
After replacing with a know-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 Immobilizer
Control Module Replacementº
section.ª(g)º wire open or short.
Fig. 1 for Step 1
1
A4
1. Immobilizer Control Module

YH4
GRAND
VITARA
8G-22 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
A812
To SDM (if equipped with AIRBAG)
To data link connector (DLC)1. Immobilizer Control Module
2. ECM / PCM (j) (i)
(i)
(i)
DTC23 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
FROM ECM/PCM OR DLC CIRCUIT OPENED/SHORTED
DTC83 NO ECM/IMMOBILIZER CONTROL MODULE CODE TRANSMITTED
(P1621) FROM IMMOBILIZER CONTROL MODULE OR DLC CIRCUIT
OPENED/SHORTED
DESCRIPTION
When the ignition switch is ON, Immobilizer Control Module requests ECM / PCM and ECM / PCM requests Immobi-
lizer Control Module to transmit ECM/Immobilizer Control Module code. If ECM/Immobilizer Control Module code
is not transmitted from ECM / PCM or Immobilizer Control Module, Immobilizer Control Module sets DTC23 and
ECM / PCM sets DTC83 (P1621).
INSPECTION:
STEPACTIONYESNO
1Check voltage between
Immobilizer Control Mod-
ule coupler terminal A8
and body ground with igni-
tion switch turned ON.
Is it 4 ± 5V?Go to Step 2.ª(i)º or ª(j)º wire
short.
21) Disconnect ECM /
PCM coupler with igni-
tion switch turned
OFF.
2) Is there continuity be-
tween Immobilizer
Control Module cou-
pler terminal A8 and
Data link connector
terminal of ECM / PCM
coupler? (For posi-
tions of Data link con-
nector terminal of
ECM / PCM coupler,
refer to Section 6E1 or
6E2.)Poor A8 connection (Immobilizer Control Module) or
Poor Data link connector terminal connection (ECM /
PCM). If connections are OK, substitute a known-good
ECM / PCM or Immobilizer Control Module and re-
check.
NOTE :

After replacing with a known-good ECM / PCM,
register ECM/Immobilizer Control Module code
in ECM / PCM by performing procedure de-
scribed in ªProcedure after ECM / PCM Replace-
mentº section.

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 Im-
mobilizer Control Module by performing proce-
dure described in ªProcedure after Immobilizer
Control Module Replacementº section.ª(i)º or ª(j)º wire be-
tween Immobilizer
Control Module and
ECM / PCM open.
Fig. 1 for step 1
1
A8
1. Immobilizer Control Module
1. Immobilizer Control Module coupler disconnected1
A8Connect to Data link connector terminal
of ECM / PCM coupler disconnected
Fig. 2 for step 2

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-23
DTC82 (P1622) FAULT IN ECM / PCM
DESCRIPTION:
This DTC is set when an internal fault is detected in ECM / PCM.
INSPECTION:
STEPACTIONYESNO
11) Ignition switch OFF.
2) Disconnect connectors from
ECM / PCM.
3) Check for proper connection
to ECM / PCM at all terminals.
Are they in good condition?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.Repair or replace.

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-27
1
1. Immobilizer Control Module
1. Steering column lower cover
1. Coil antenna
IMMOBILIZER CONTROL MODULE
Removal
1) Disconnect negative (±) cable at battery.
2) Remove steering column hole cover.
3) Disconnect coupler at Immobilizer Control Module.
4) Remove Immobilizer Control Module.
Installation
Reverse removal procedure for installation.
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 / PCM by performing procedure described
in ªProcedure after Immobilizer Control Module Replacementº
section.
COIL ANTENNA
Removal
1) Disconnect negative (±) cable at battery.
2) Remove steering column upper and lower cover by removing 3
screws.
3) Remove steering column hole cover.
4) Remove coil antenna.
Installation
For installation, reverse removal procedure.

YH4
GRAND
VITARA
IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED) 8G-29
7) If any other Transponder code for ignition key with a built-in
transponder needs to be registered, repeat above Steps 3), 5)
and 6).
NOTE:

Up to 4 Transponder codes for ignition key with a built-in
transponder can be registered.

It is not possible to register the same Transponder code
for ignition key with a built-in transponder as the one al-
ready registered in Immobilizer Control Module.
PROCEDURE AFTER IMMOBILIZER
CONTROL MODULE REPLACEMENT
When Immobilizer Control Module was replaced, including when
replaced because rechecking by using a known-good Immobilizer
Control Module was necessary during trouble diagnosis, register
Transponder code and ECM / Immobilizer Control Module code in
Immobilizer Control Module and ECM / Immobilizer Control Module
code in ECM/PCM by performing following procedure.
1) Perform Steps 1) and 2) described in ªHow to register ignition
keyº section.
2) Prepare ignition key with a built-in transponder. And then turn
ignition switch ON by using it.
3) Using Suzuki scan tool, clear all transponder codes registered
in Immobilizer Control Module by executing ªCLR. TRANS COD
(CLEAR TP CODE)º command in SELECT MODE menu.
NOTE:
When ªCLR. TRANS COD (CLEAR TP CODE)º command is
executed with the malfunction indicator lamp (the lamp for
vehicles equipped with the monitor coupler) ON or the im-
mobilizer indicator lamp (the lamp for vehicles not
equipped with the monitor coupler) ON, it remains ON even
after execution of that command is over. It will start flashing
when the ignition switch is turned OFF once and then
turned ON after some seconds.
4) Using Suzuki scan tool, register Transponder code in Immobiliz-
er Control Module by executing ªENT. TRANS COD (ENT. TP
CODE)º command in SELECT MODE menu.
5) Using Suzuki scan tool, register ECM / Immobilizer Control Mod-
ule code in both Immobilizer Control Module and ECM / PCM by
executing ªRECORD ECU (RECORD ECM / PCM / ICM)º com-
mand in SELECT MODE menu.
6) [Vehicle equipped with monitor coupler]
Make sure that malfunction indicator lamp lights when ignition
switch is turned OFF once and then ON.
[Vehicle not equipped with monitor coupler]
Make sure that immobilizer indicator lamp lights when ignition
switch is turned OFF once and then ON.
7) If any other Transponder code for ignition key with a built-in trans-
ponder needs to be registered, repeat above Steps 2), 4) and 6).
NOTE:

Up to 4 Transponder codes for ignition key with a built-in
transponder can be registered.

It is not possible to register the same Transponder code
for ignition key with a built-in transponder as the one al-
ready registered in Immobilizer Control Module.

YH4
GRAND
VITARA
8G-30 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
09931-76030
16 / 14 pin DLC cable
09931-76011
Suzuki scan tool (Tech 1A kit)1. Storage case
2. Operator's manual
3. Tech 1A
4. DLC cable
(14 / 26 pin, 09931-76040)
5. Test lead/probe
6. Power source cable
7. DLC cable adapter
8. Self-test adapter
Immobilizer cartridge of
version 1.1 or more
NOTE:
Use this cable only with im-
mobilizer cartridge of ver-
sion 1.1 or more.
Use of this cable with 96
immobilizer cartridge will
disable 96 immobilizer car-
tridge from operating prop-
erly.
Mass storage cartridge of
version1.5 or more
PROCEDURE AFTER ECM / PCM
REPLACEMENT
When ECM / PCM was replaced, including when replaced because
rechecking by using a known-good ECM / PCM was necessary dur-
ing trouble diagnosis, register ECM/Immobilizer Control Module
code in ECM / PCM by performing following procedure.
1) Perform Steps 1) and 2) described in ªHow to register ignition
keyº section. And then turn ignition switch ON.
2) Using TECH1, register ECM/Immobilizer Control Module code in
ECM / PCM by executing ªRECORD ECU (RECORD ECM / PCM/
ICM)º command in SELECT MODE menu.
NOTE:
For operation procedure of Suzuki scan tool, refer to TECH1
operator's manual.
3) [Vehicle equipped with monitor coupler]
Make sure that malfunction indicator lamp lights when ignition
switch is turned OFF once and then ON.
[Vehicle not equipped with monitor coupler]
Make sure that immobilizer indicator lamp lights when ignition
switch is turned OFF once and then ON.
SPECIAL TOOLS