Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1397
6E2–39
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
D
Identifying stored Diagnostic Trouble Codes (DTCs).
D
Clearing DTCs.
D
Performing output control tests.
D
Reading serial data.
TS24064
Decimal/Binary/Hexadecimal Conversions
Beginning in 1996, Federal Regulations require that all
auto manufacturers selling vehicles in the United States
provide Scan Tool manufacturers with software
information to display vehicle operating parameters. All
Scan Tool manufacturers will display a variety of vehicle
information which will aid in repairing the vehicle. Some
Scan Tools will display encoded messages which will aid
in determining the nature of the concern. The method of
encoding involves the use of a two additional numbering
systems: Binary and Hexadecimal.
The binary number system has a base of two numbers.
Each digit is either a 0 or a 1. A binary number is an eight
digit number and is read from right to left. Each digit has a
position number with the farthest right being the 0 position
and the farthest left being the 7 position. The 0 position,
when displayed by a 1, indicates 1 in decimal. Each
position to the left is double the previous position and
added to any other position values marked as a 1.
A hexadecimal system is composed of 16 different alpha
numeric characters. The alpha numeric characters used
are numbers 0 through 9 and letters A through F. The
hexadecimal system is the most natural and common
approach for Scan Tool manufacturers to display data
represented by binary numbers and digital code.
Verifying Vehicle Repair
Verification of vehicle repair will be more comprehensive
for vehicles with OBD II system diagnostic. Following a
repair, the technician should perform the following steps:
1. Review and record the Fail Records and/or Freeze
Frame data for the DTC which has been diagnosed
(Freeze Frame data will only be stored for an A or B
type diagnostic and only if the MIL has been
requested).
2. Clear DTC(s).
3. Operate the vehicle within conditions noted in the Fail
Records and/or Freeze Frame data.
4. Monitor the DTC status information for the DTC which
has been diagnosed until the diagnostic test
associated with that DTC runs.
Following these steps are very important in verifying
repairs on OBD ll systems. Failure to follow these steps
could result in unnecessary repairs.
Reading Diagnostic Trouble Codes Using
The Tech 2 Scan Tool
The procedure for reading diagnostic trouble code(s) is to
use a diagnostic Scan Tool. When reading DTC(s), follow
instructions supplied by tool manufacturer.
Clearing Diagnostic Trouble Codes
IMPORTANT:
Do not clear DTCs unless directed to do
so by the service information provided for each diagnostic
procedure. When DTCs are cleared, the Freeze Frame
and Failure Record data which may help diagnose an
intermittent fault will also be erased from memory.
If the fault that caused the DTC to be stored into memory
has been corrected, the Diagnostic Executive will begin to
count the “warm-up” cycles with no further faults
detected, the DTC will automatically be cleared from the
PCM memory.
To clear Diagnostic Trouble Codes (DTCs), use the
diagnostic Scan Tool “clear DTCs” or “clear information”
function. When clearing DTCs follow instructions
supplied by the tool manufacturer.
When a Scan Tool is not available, DTCs can also be
cleared by disconnecting
one of the following sources for
at least thirty (30) seconds.
NOTE: To prevent system damage, the ignition key must
be “OFF” when disconnecting or reconnecting battery
power.
D
The power source to the control module. Examples:
fuse, pigtail at battery PCM connectors, etc.
D
The negative battery cable. (Disconnecting the
negative battery cable will result in the loss of other
on-board memory data, such as preset radio tuning).
6E2–40
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
From 98 MY, Isuzu dealer service departments are
recommended to use the Tech 2 Scan Tool. Please refer
to the Tech 2 user guide.
901RW180
Legend
(1) PCMCIA Card
(2) RS 232 Loop Back Connector
(3) SAE 16/19 Adaptor
(4) DLC Cable
(5) Tech–2
6E2–41
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2 Features
1. Tech 2 is a 12 volt system. Do not apply 24 volts.
2. After connecting and/or installing the Vehicle
Communications Interface (VCI) module, PCMCIA
card and DLC connector to the Tech 2, connect the
tool to the vehicle DLC.
3. Make sure the Tech 2 is OFF when removing or
installing the PCMCIA card.
4. The PCMCIA card has a capacity of 10 Megabytes
which is 10 times greater than the memory of the Tech
1 Mass Storage Cartridge.
5. The Tech 2 has the capability of two snapshots.
6. The PCMCIA card is sensitive to magnetism and
static electricity, so care should be taken in the
handling of the card.
7. The Tech 2 can plot a graph when replaying a
snapshot.
8. Always return to the Main Menu by pressing the EXIT
key several times before shutting down.
9. To clear Diagnostic Trouble Codes (DTCs), open
Application Menu and press “F1: Clear DTC Info”.
Getting Started
D
Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:
1. Insert the Isuzu system PCMCIA card (1) into the
Tech 2 (5).
2. Connect the SAE 16/19 adapter (3) to the DLC cable
(4).
3. Connect the DLC cable to the Tech 2 (5)
4. Make sure the vehicle ignition is off.
5. Connect the Tech 2 SAE 16/19 adapter to the vehicle
DLC.
826RW002
6. Turn on the vehicle ignition.
7. Power the Tech 2 ON and verify the Tech 2 power up
display.
060RW009
NOTE: The RS232 Loop back connector is only to use for
diagnosis of Tech 2. Refer to user guide of the Tech 2.
6E2–42
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Operating Procedure (For Example)
The power up screen is displayed when you power up the
tester with the Isuzu systems PCMCIA card. Follow the
operating procedure below.
060R100102
060R200038
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