Isuzu N-Series. Service manual — part 1194
SRS CONTROL SYSTEM 9C-23
Step
Action
Value
YES
NO
1
Turn the starter switch to ON.
Do warning lamps other than “SRS” operate
properly?
—
2
1. Turn the starter switch to OFF.
2. Remove the SRS control unit connector.
3. Turn the starter switch to ON.
Does the “SRS” warning lamp come on?
—
Replace the SRS
control unit.Go to
3
Replace the meter assembly.
Is this step completed?
—
4
1. Either of the “SRS” warning lamp power
supply circuit or “SRS” warning lamp is
open.
2. Find the cause.
Is this step completed?
—
5
Connect all the SRS parts, and check that
those are installed properly.
Is this step completed?
—
Check the repair.
9C-24 SRS CONTROL SYSTEM
Trouble Diagnosis with Scan Tool
Tech 2
Tech 2 is a useful tool to diagnose electric fault and sys-
tem check of the airbag system.
Though it is possible to diagnose the fault without Tech
2, using the Tech 2 allows you to diagnose quickly.
Tech 2 is small and light tester. It can communicate with
the SRS control unit to perform various types of diagno-
sis and tests by connecting the self-diagnosis connector
equipped to the vehicle.
Legend
1. PCMCIA card
2. SAE 16/19 adapter
3. DLC cable
4. Tech 2
Feature of Tech 2
Caution:
• Tech 2 (4) is a 12-V power supply system. Do not
use 24-V power supply. If the vehicle system is
equipped with a 24-V power supply, use a 12-V
battery with an adapter for power distribution.
• Never use cigarette lighter socket.
1
4
2
3
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SRS CONTROL SYSTEM 9C-25
• Set the PCMCIA card (1) to Tech 2, and attach the
VCI (Vehicle Communication Interface) (2)(3) to
connect to the DLC in the vehicle.
• Turn the power switch off before installing/remov-
ing the PCMCIA card.
• Tech 2 has a capacity of equivalent to two snap-
shots.
• PCMCIA card is sensitive to magnetic and electro-
static. Handle it with care.
• Tech 2 can plot a graph of snapshots.
• Pressing the EXIT key can bring back to the main
menu anytime.
• Open the application menu and press the
“F1:Clear DTC Info” or the DTC clear to clear diag-
nosis trouble codes (DTCs).
How to Connect Tech 2
1. Insert the PCMCIA card to the Tech 2 body.
2. Install the SAE 16/19 adapter to the DLC cable.
3. Install the DLC cable to the Tech 2 body.
4. Make sure that the ignition key is OFF.
5. Connect the SAE-16/19 adapter of the Tech 2 to
the self-diagnosis connector (black) in the body
side.
Connect an adapter cable between the Tech 2 and
12-V battery.
Legend
1. 3A-fuse
6. Turn the ignition switch to “ON” and press the
“PWR” key of the Tech 2.
7. Check the display of the Tech 2.
Caution:
Make sure that no power is supplied to the Tech 2 when
installing/removing the PCMCIA card.
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1
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Press ENTER to continue.
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9C-26 SRS CONTROL SYSTEM
Operation Procedure
Menu
• The following chart shows the functions used by
the current Tech 2 software.
DTC (Diagnostic Trouble Code) Mode
Two options are available for Tech 2 DTC mode. After
selecting the DTC, the following menu is displayed.
• DTC Info (DTC information)
• Clear Info (DTC clear)
Press ENTER to continue.
Vehicle identification
Select one of the followings.
MY
Main menu
F0 : Diagnostics
F1 : List of capture data
F2 : Tool option
F3 : Download/Upload help
(1) Press "ENTER" key.
(2) Select "F0 : Diagnostics".
(3) Select model year.
Go to next page.
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F0: Diagnostic trouble code
F0: Read the DTC in the order of priority.
F1: Clear the DTC.
F1: Data display
F2: Snapshot
F3: Programming
F0: Event data clear prohibition
Vehicle identification
Select one of the followings.
(UB) Trooper, Bighorn
(UE) Rodeo/Amigo,Wizard
(N* ) ELF, NPR, NQR
Vehicle type
(4) Select "(N* ) ELF, NPR, NQR".
F1 : Transmission
F0 : Engine
F2 : Chassis
F3 : Body
System selection menu
(N* ) ELF, NPR, NQR
(5) Select "F3 : Body".
Vehicle identification
Select one of the followings.
Airbag
Others
Body
(6) Select Airbag.
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