Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1240

6E1–36

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

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Fuel Trim

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Engine Speed

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Engine Load

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Engine Coolant Temperature

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Vehicle Speed

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TP Angle

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MAP/BARO

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Injector Base Pulse Width

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Loop Status

Intermittent Malfunction Indicator Lamp
In the case of an ”intermittent” fault, the MIL (”Check
Engine” lamp) may illuminate and then (after three trips)
go OFF. However, the corresponding diagnostic trouble
code will be stored in the memory. When unexpected
diagnostic trouble codes appear, check for an intermittent
malfunction.
A diagnostic trouble code may reset. Consult the
”Diagnostic Aids” associated with the diagnostic trouble
code. A physical inspection of the applicable sub–system
most often will resolve the problem.

Data Link Connector (DLC)
The provision for communicating with the control module
is the Data Link Connector (DLC). It is located at the lower
left of the instrument panel. The DLC is used to connect to
the Tech 2 Scan tool. Some common uses of the Tech 2
are listed below:

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Identifying stored Diagnostic Trouble Codes (DTCs)

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Clearing DTCs

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Performing output control tests

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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 diagnostics. 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 II systems. Failure to follow these steps
could result in unnecessary repairs.

Reading Diagnostic Trouble Codes Using
A 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.

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RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

When a Tech 2 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.

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The power source to the control module. Examples:
fuse, pigtail at battery PCM connectors etc.

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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).

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) R232 Loop Back Connector

(3) SAE 16/19 Adaptor
(4) DLC Cable
(5) Tech 2

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RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Tech 2 Features

1. Tech 2 is a 12 volt system. Do not apply 24 volt.
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 powered 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

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Before operating the Isuzu PCMCIA card with the
Tech 2, the following steps must be performed:

1. The Isuzu 98 System PCMCIA card (1) inserts 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.

740RW060

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 and refer to user guide of the Tech 2.

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RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Operating Procedure (Example)

The power up screen is displayed when you power up the
tester with the Isuzu system PCMCIA card. Follow the
operating procedure below.

060R100088

060R100087