ecm SUZUKI GRAND VITARA 2003 2.G Service Repair Manual

YH4
GRAND
VITARA
8G-20 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
DTC21 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED
(IMMOBILIZER CONTROL MODULE SIDE)
DTC81 ECM/IMMOBILIZER CONTROL MODULE CODE NOT MATCHED
(P1623) (ECM / PCM SIDE)
DTC84 ECM/IMMOBILIZER CONTROL MODULE CODE NOT REGISTERED
(P1620)
DESCRIPTION:

DTC21
Immobilizer Control Module checks if ECM/Immobilizer Control Module code transmitted from ECM / PCM and
that registered in Immobilizer Control Module match when ignition switch is ON. If they do not, this DTC is set.

DTC81 (P1623)
ECM / PCM checks if ECM/Immobilizer Control Module code transmitted from Immobilizer Control Module and
that registered in ECM / PCM match when ignition switch is ON. If they do not, this DTC is set.

DTC84 (P1620)
ECM / PCM checks if code transmitted from Immobilizer Control Module and that registered in ECM / PCM match
when ignition switch is ON. If there is no ECM/Immobilizer Control Module code registered in ECM / PCM, this
DTC is set.
INSPECTION:
Perform procedure described in ªProcedure after ECM / PCM Replacementº section.

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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

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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
8G-24 IMMOBILIZER CONTROL SYSTEM (IF EQUIPPED)
1
2
3
1
2
1. Immobilizer Control Module
2. Immobilizer Control Module Coupler
3. Body ground
INSPECTION OF ECM / PCM, IMMOBILIZER
CONTROL MODULE AND ITS CIRCUIT
ECM / PCM, Immobilizer Control Module and its circuit can be
checked at ECM / PCM wiring couplers and Immobilizer Control
Module wiring coupler by measuring voltage and resistance. De-
scribed here is only inspection of Immobilizer Control Module. For
inspection of ECM / PCM, refer to ªSECTION 6E1 or 6E2º.
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.
Voltage Check
1) Remove Immobilizer Control Module from body with ignition
switch OFF, referring to p. 8G-24.
2) Connect Immobilizer Control Module coupler to Immobilizer
Control Module.
3) Check voltage at each terminal of coupler connected.
NOTE:
As each terminal voltage is affected by the battery voltage,
confirm that it is 11 V or more when ignition switch is ON.
TERMINALCIRCUITNORMAL
VOLTAGECONDITION
A1Coil antenna 10 V
A2Coil antenna 20 VIgnition switch ON
A3Power source10 ± 14 V
A4Ignition signal10 ± 14 VIgnition switch ONA4Ignition signal0 ± 0.8 VIgnition switch OFF
A5Diagnosis output0 ± 14 VIgnition switch ONA5Diagnosis output0 VIgnition switch OFF
A6Blank±±
A7Ground±±
A8Data link connector
(Serial data terminal)4 ± 5 VIgnition switch ON
A9
A10Blank±±
NOTE:
When measuring voltage at A1 and A2 terminals with ignition switch turned ON, be sure to turn ignition
switch ON before connecting positive probe of voltmeter to A1 or A2 terminal. If it is not turned ON first,
DTC13 (Diagnostic Trouble Code 13) may be indicated.

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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

YH4
GRAND
VITARA
WIRE HARNESS COLOR
B : Black
B/W : Black/White
Bl : Blue
Bl/B : Blue/Black
Bl/R : Blue/Red
Br : BrownG : Green
Gr : Gray
G/R : Green/Red
Lg : Lightgreen
P : Pink
V : VioletY : Yellow
Y / G : Yellow/Green
Y/R : Yellow/Red
W : White
W/B : White/Black
1. From main fuse
2. Ignition switch
3. ªIG
.COIL METERº fuse in J/B
4. ªAIR BAGº warning lamp in combination meter
5. ªAIR BAGº fuse in ªAIR BAGº fuse box
6. Connection detection pin
7. To ECM (or PCM), ICM (if equipped) and ABS
controller (if equipped)
8. To data link connector (DLC)
9. ªAIR BAGº monitor coupler
10. SDM
11. Contact coil assembly
12. Driver air bag (inflator) module
13. Driver seat belt pretensioner (if equipped)
14. Passenger air bag (inflator) module
15. Passenger seat belt pretensioner (if equipped)
16. Pretensioner harness (if equipped)
17. Ground for air bag system
TERMINAL
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A13 A11
A12
A14
A15
A16
Passenger air bag (inflator) moduleLow
High
CIRCUIT
Data link connector (DLC)
Low
High
Low
High
Low
High ªAIR BAGº warning lamp
Driver air bag (inflator) module
Diagnosis switch
±±±±±±±±±
Ground
Passenger pretensioner
Driver pretensioner
Ignition switch (power source)±±±±±±±±±
±±±±±±±±±
CONNECTOR ªAº (SDM connector) TERMINAL ARRANGEMENT OF SDM
(VIEWED FROM HARNESS SIDE)
L1
L2Connection detection pin
: Shorting bar
: Air bag harness
ªAº
ªHº : Connector
AIR BAG SYSTEM 10B-5
SYSTEM WIRING DIAGRAM

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GRAND
VITARA
1. DLC
2. Scan tool1. ªW/Bº wire terminal
AIR BAG SYSTEM 10B-23
TABLE D ± SDM CANNOT COMMUNICATE THROUGH THE SERIAL DATA CIRCUIT
(Page 2 of 2)
STEPACTIONYESNO
21) Check if communication is possible by
trying communication with other
controller (ECM (or PCM), ICM or ABS
controller).
2) Is it possible to communicate with other
controller?Go to step 3.Repair open in common
section of serial data circuit
(ªW/Bº wire circuit) used by
all controllers or short to
ground or power circuit
which has occurred some-
where in serial data circuit
(ªW/Bº wire circuit).
31) With ignition switch OFF, disconnect
SDM and ªLamp, DLC and Monitor
Coupler Groundº (ªEº) connector.
2) Check proper connection at ªW/Bº wire
terminal for DLC in ªEº connector.
3) If OK, then check resistance between
ªW/Bº wire terminal in ªEº connector and
ªA4º terminal of SDM connector.
4) Is resistance 1
or less?Substitute a known-good
SDM and recheck.Repair high resistance or
open in ªW/Bº wire circuit
(in air bag harness).
Fig. for STEP 1 Fig. for STEP 3
Special Tool
(A): 09932-76010
NOTE:
Upon completion of inspection and repair work, perform following items.
1) Reconnect all air bag system components, ensure all components are properly mounted.
2) Repeat ªAir Bag Diagnostic System Check Flow Tableº, referring to p.10B-11 to confirm that the trouble
has been corrected.