Opel Frontera UE. Manual - part 787

6E1–31

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DTC Types

Each DTC is directly related to a diagnostic test. The
Diagnostic Management System sets DTC based on the
failure of the tests during a trip or trips. Certain tests must
fail two (2) consecutive trips before the DTC is set. The
following are the four (4) types of DTCs and the
characteristics of those codes:

Type A

Emissions related

Requests illumination of the MIL of the first trip with a
fail

Stores a History DTC on the first trip with a fail

Stores a Freeze Frame (if empty)

Stores a Fail Record

Updates the Fail Record each time the diagnostic
test fails

Type B

Emissions related

”Armed” after one (1) trip with a fail

”Disarmed” after one (1) trip with a pass

Requests illumination of the MIL on the

second

consecutive trip with a fail

Stores a History DTC on the second consecutive trip
with a fail (The DTC will be armed after the first fail)

Stores a Freeze Frame on the second consecutive
trip with a fail (if empty)

Stores a Fail Record when the first test fails (not
dependent on

consecutive trip fails)

Updates the Fail Record each time the diagnostic
test fails

(Some special conditions apply to misfire and fuel trim
DTCs)

Type C (if the vehicle is so equipped)

Non–Emissions related

Requests illumination of the Service Lamp or the
service message on the Drive Information Center
(DIC) on the

first trip with a fail

Stores a History DTC on the

first trip with a fail

Does not store a Freeze Frame

Stores Fail Record when test fails

Updates the Fail Record each time the diagnostic
test fails

Type D. (

Type D non–emissions related are not

utilized on certain vehicle applications).

Non–Emissions related

Does not request illumination of any lamp

Stores a History DTC on the

first trip with a fail

Does not store a Freeze Frame

Stores Fail Record when test fails

Updates the Fail Record each time the diagnostic
test fails

IMPORTANT:

Only four Fail Records can be stored.

Each Fail Record is for a different DTC. It is possible that
there will not be Fail Records for every DTC if multiple
DTCs are set.

Storing and Erasing Freeze Frame Data and Failure
Records
Government regulations require that engine operating
conditions be captured whenever the MIL is illuminated.
The data captured is called Freeze Frame data. The
Freeze Frame data is very similar to a single record of
operating conditions. Whenever the MIL is illuminated,
the corresponding record of operating conditions is
recorded to the Freeze Frame buffer.
Freeze Frame data can only be overwritten with data
associated with a misfire or fuel trim malfunction. Data
from these faults take precedence over data associated
with any other fault. The Freeze Frame data will not be
erased unless the associated history DTC is cleared.
Each time a diagnostic test reports a failure, the current
engine operating conditions are recorded in the

Failure

Records buffer. A subsequent failure will update the
recorded operating conditions. The following operating
conditions for the diagnostic test which failed

typically

include the following parameters:

Engine Speed

Engine Load

Engine Coolant Temperature

Vehicle Speed

MAP/BARO

Injector Base Pulse Width

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:

Identifying stored Diagnostic Trouble Codes (DTCs)

Clearing DTCs

Performing output control tests

Reading serial data

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X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

TS24064

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 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
ECM 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 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.

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

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).

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X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

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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X22SE 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

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

1. The Isuzu 99 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.

810RW317

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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