Table of Contents
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1. Safety Precautions and Warnings ...................................... 1
2. General Information ........................................................... 2
2.1 On-Board Diagnostics ................................................ 2
2.2 Diagnostic Trouble Codes (DTCs) ............................ 2
2.3 Location of the Data Link Connector (DLC) .......... 3
2.4 OBD II/EOBD Readiness Monitors ......................... 4
2.5 OBD II/EOBD Monitor Readiness Status ............... 5
2.6 OBD II/EOBD Definitions ......................................... 6
3. Using the Scan tool .............................................................. 8
3.1 Tool Description ......................................................... 8
3.2 Specifications ............................................................ 10
3.3 Accessories ................................................................ 10
3.4 Navigation Characters ............................................. 10
3.5 Power ......................................................................... 11
3.6 Obtaining Login Password ...................................... 11
3.7 Product Setup ........................................................... 13
3.8 Tool Information ...................................................... 21
3.9 Battery Replacement ............................................... 22
3.10 Vehicle Coverage ...................................................... 23
3.11 Product Troubleshooting ........................................ 23
4. Diagnostics ......................................................................... 24
4.1 OBD II/EOBD Diagnostics ...................................... 24
4.2 Pre-OBD II Vehicle Diagnostics ............................. 50
4.3 Review Data .............................................................. 62
5. Updating and Printing ...................................................... 69
6. Appendix ............................................................................ 70
6.1 PID List ..................................................................... 70
6.2 In-use Performance Tracking Data List ................ 76
7. Warranty and Service ....................................................... 79
7.1 Limited One Year Warranty .................................. 79
7.2 Service Procedures ................................................... 79
1. Safety Precautions and Warnings
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To prevent personal injury or damage to vehicles and/or the scan
tool, read this instruction manual first and observe the following
safety precautions at a minimum whenever working on a vehicle:
l Always perform automotive testing in a safe environment.
l Wear safety eye protection that meets ANSI standards.
l Keep clothing, hair, hands, tools, test equipment, etc. away from
all moving or hot engine parts.
l Operate the vehicle in a well ventilated work area: Exhaust gases
are poisonous.
l Put blocks in front of the drive wheels and never leave the vehicle
unattended while running tests.
l Use extreme caution when working around the ignition coil,
distributor cap, ignition wires and spark plugs. These components
create hazardous voltages when the engine is running.
l Put the transmission in PARK (for automatic transmission) or
NEUTRAL (for manual transmission) and make sure the parking
brake is engaged.
l Keep a fire extinguisher suitable for gasoline/chemical/electrical
fires nearby.
l Don′t connect or disconnect any test equipment while the ignition
is on or the engine is running.
l Keep the scan tool dry, clean, free from oil/water or grease. Use a
mild detergent on a clean cloth to clean the outside of the scan tool,
when necessary.
l No solvents such as alcohol are allowed to clean the keypad or
display. Use a mild nonabrasive detergent and a soft cotton cloth.
Do not soak the keypad as the keypad is not waterproof.
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2. General Information
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2.1 On-Board Diagnostics
The first generation of On-Board Diagnostics (called OBD I) was
developed by the California Air Resources Board (CARB) and
implemented in 1988 to monitor some of the emission control
components on vehicles. As technology evolved and the desire to
improve the On-Board Diagnostic system increased, a new generation of
On-Board Diagnostic system was developed. This second generation of
On-Board Diagnostic regulations is called "OBD II".
The European version of OBD II is commonly referred to as EOBD and
has protocols developed for the European vehicle market.
The OBD II system is designed to monitor emission control systems
and key engine components by performing either continuous or
periodic tests of specific components and vehicle conditions. When a
problem is detected, the OBD II system turns on a warning lamp (MIL)
on the vehicle instrument panel to alert the driver typically by the
phrase of "Check Engine″ or″Service Engine Soon″. The system will
also store important information about the detected malfunction so that
a technician can accurately find and fix the problem. Here below
follow three pieces of such valuable information:
1) Whether the Malfunction Indicator Light (MIL) is
commanded 'on' or 'off';
2) Which, if any, Diagnostic Trouble Codes (DTCs) are stored;
3) Readiness Monitor status.
2.2 Diagnostic Trouble Codes (DTCs)
EOBD/OBD II Diagnostic Trouble Codes are codes that are stored by
the on-board computer diagnostic system in response to a problem
found in the vehicle. These codes identify a particular problem area
and are intended to provide you with a guide as to where a fault might
be occurring within a vehicle. OBD II/EOBD Diagnostic Trouble
Codes consist of a five-digit alphanumeric code. The first character, a
letter, identifies which control system sets the code. The other four
characters, all numbers, provide additional information on where the
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DTC originated and the operating conditions that caused it to set. Here
sy
stems
P 0 2 0 2
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below is an example to illustrate the structure of the digits:
DTC Example
Systems
B=Body
C=Chassis
P=Powertrain
U=Network
Code Type
Generic (SAE):
P0, P2, P34-P39
B0, B3
C0, C3
U0, U3.
Manufacturer Specific:
P1, P30-p33
B1, B2
C1, C2
U1, U2
Identifying specific
malfunctioning
section of the
Sub-systems
1= Fuel and Air Metering
2= Fuel and Air Metering
3= Ignition System or Engine Misfire
4= Auxiliary Emission Controls
5= Vehicle Speed Control and Idle
Controls
6= Computer Output Circuits
7= Transmission Controls
8= Transmission Controls
2.3 Location of the Data Link Connector (DLC)
The DLC (Data Link Connector or Diagnostic Link Connector) is the
standardized 16-cavity connector where diagnostic scan tools interface
with the vehicle's on-board computer. The DLC is usually located 12
inches from the center of the instrument panel (dash), under or around
the driver′s side for most vehicles. If Data Link Connector is not
located under dashboard, a label should be there telling location. For
some Asian and European vehicles, the DLC is located behind the
ashtray and the ashtray must be removed to access the connector. If the
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DLC cannot be found, refer to the vehicle′s service manual for the
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location.
2.4 OBD II/EOBD Readiness Monitors
An important part of a vehicle′s OBD II/EOBD system is the
Readiness Monitors, which are indicators used to find out if all of the
emissions components have been evaluated by the OBD II/EOBD
system. They are running periodic tests on specific systems and
components to ensure that they are performing within allowable limits.
Currently, there are eleven OBD II/EOBD Readiness Monitors (or I/M
Monitors) defined by the U.S. Environmental Protection Agency
(EPA). Not all monitors are supported by all vehicles and the exact
number of monitors in any vehicle depends on the motor vehicle
manufacturer′s emissions control strategy.
Continuous Monitors -- Some of the vehicle components or systems
are continuously tested by the vehicle′s OBD II system, while others
are tested only under specific vehicle operating conditions. The
continuously monitored components listed below are always ready:
1）Misfire
2）Fuel System
3）Comprehensive Components (CCM)
Once the vehicle is running, the OBD II/EOBD system is continuously
checking the above components, monitoring key engine sensors,
watching for engine misfire, and monitoring fuel demands.
Non-Continuous Monitors -- Unlike the continuous monitors, many
emissions and engine system components require the vehicle to be
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operated under specific conditions before the monitor is ready. These
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monitors are termed non-continuous monitors and are listed below:
1) EGR System
2) O2 Sensors
3) Catalyst
4) Evaporative System
5) O2 Sensor Heater
6) Secondary air
7) Heated Catalyst
8) A/C system
2.5 OBD II/EOBD Monitor Readiness Status
OBD II systems must indicate whether or not the vehicle′s PCM′s
monitor system has completed testing on each component.
Components that have been tested will be reported as″Ready″,
or″Complete″, meaning they have been tested by the OBD II system.
The purpose of recording readiness status is to allow inspectors to
determine if the vehicle′s OBD II system has tested all the components
and/or systems.
The powertrain control module (PCM) sets a monitor to″Ready″
or″Complete″ after an appropriate drive cycle has been performed. The
drive cycle that enables a monitor and sets readiness codes to″Ready″
varies for each individual monitor. Once a monitor is set as″Ready″
or″Complete″, it will remain in this state. A number of factors,
including erasing of diagnostic trouble codes (DTCs) with a scan tool
or a disconnected battery, can result in Readiness Monitors being set
to″Not Ready″. Since the three continuous monitors are constantly
evaluating, they will be reported as″Ready″ all of the time. If testing of
a particular supported non-continuous monitor has not been completed,
the monitor status will be reported as″Not Complete″ or″Not Ready.″
In order for the OBD monitor system to become ready, the vehicle
should be driven under a variety of normal operating conditions. These
operating conditions may include a mix of highway driving and stop
and go, city type driving, and at least one overnight-off period. For
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specific information on getting your vehicle′s OBD monitor system
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ready, please consult your vehicle owner′s manual.
2.6 OBD II/EOBD Definitions
Powertrain Control Module (PCM) -- EOBD terminology for the
on-board computer that controls engine and drives train.
Malfunction Indicator Light (MIL) -- Malfunction Indicator Light
(Service Engine Soon, Check Engine) is a term used for the light on the
instrument panel. It is to alert the driver and/or the repair technician
that there is a problem with one or more of vehicle's systems and may
cause emissions to exceed federal standards. If the MIL illuminates
with a steady light, it indicates that a problem has been detected and the
vehicle should be serviced as soon as possible. Under certain
conditions, the dashboard light will blink or flash. This indicates a
severe problem and flashing is intended to discourage vehicle
operation. The vehicle onboard diagnostic system can not turn the MIL
off until necessary repairs are completed or the condition no longer
exists.
DTC -- Diagnostic Trouble Codes (DTC) that identify which section
of the emission control system has malfunctioned.
Enabling Criteria -- Also termed Enabling Conditions. They are the
vehicle-specific events or conditions that must occur within the engine
before the various monitors will set, or run. Some monitors require
the vehicle to follow a prescribed″drive cycle″ routine as part of the
enabling criteria. Drive cycles vary among vehicles and for each
monitor in any particular vehicle.
EOBD Drive Cycle -- A specific mode of vehicle operation that
provides conditions required to set all the readiness monitors
applicable to the vehicle to the″ready″ condition. The purpose of
completing an EOBD drive cycle is to force the vehicle to run its
onboard diagnostics. Some form of a drive cycle needs to be performed
after DTCs have been erased from the PCM′s memory or after the
battery has been disconnected. Running through a vehicle′s complete
drive cycle will″set″ the readiness monitors so that future faults can be
detected. Drive cycles vary depending on the vehicle and the monitor
that needs to be reset. For vehicle specific drive cycle, consult the
vehicle′s Owner′s Manual.
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Freeze Frame Data -- When an emission-related fault occurs, the
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EOBD system not only sets a code but also records a snapshot of the
vehicle operating parameters to help in identifying the problem. This
set of values is referred to as Freeze Frame Data and may include
important engine parameters such as engine RPM, vehicle speed, air
flow, engine load, fuel pressure, fuel trim value, engine coolant
temperature, ignition timing advance, or closed loop status.
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3. Using the Scan tool
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3.1 Tool Description
① LCD DISPLAY -- Indicates test results. Backlit, 128 x 64 pixel
display with contrast adjustment.
②③④are three function keys that correspond with ″buttons″ on
screens for executing commands.
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② FUNCTIONAL BUTTON -- Confirms a selection or an action
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from a menu, and enters next menu; It is also used to shift between
text and graphic viewing of live data when viewing and playing
back live data.
③
④
⑤
⑥
⑦
⑧
⑨
⑩
11 EXTENSION CABLE -- Connects the scan tool to the vehicle′s
○
FUNCTIONAL BUTTON -- Saves retrieved data;
Selects/deselects an item when viewing or recording live data; and
plays/stops playing back live data.
FUNCTIONAL BUTTON -- Cancels a selection (or action)
from a menu, and returns to previous menu.
UP SCROLL BUTTON -- Moves up through menu and
submenu items in menu mode. When a DTC definition covers more
than one screen, moves up through the current screen to previous
screens for additional data. When looking up DTC, it is used to
change value of selected character.
DOWN SCROLL BUTTON -- Moves down through menu and
submenu items in menu mode. When a DTC definition covers more
than one screen, moves up through the current screen to previous
screens for additional data. When looking up DTC, it is used to
change value of selected character.
LEFT SCROLL BUTTON -- Moves to previous screen, or to
previous character when looking up DTCs. It is also used to view
previous trouble code when viewing DTCs.
RIGHT SCROLL BUTTON -- Moves to next screen, or to
next character when looking up DTC. It is also used to view next
trouble code when viewing DTC.
HELP BUTTON -- Provides help information when pressed.
POWER SWITCH -- Turns on/off the scan tool when powered
by AAA battery, and resets the tool when powered via vehicle
battery.
Data Link Connector (DLC) via diagnostic connectors.
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3.2 Specifications
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1) Display: Backlit, 128 x 64 pixel display with contrast adjustment.
2) Operating Temperature: 0 to 60°C (32 to 140 °F).
3) Storage Temperature: -20 to 70°C (-4 to 158 °F).
4) External Power: 6.0 to 21.0 V power provided via vehicle
battery.
5) Internal Power: 6V power provided by four 1.5V batteries.
6) Dimensions:
Length Width Height
210 mm (8.27″) 108 mm (4.25″) 38 mm (1.50″)
7) NW: 1.0 kg (2.2lb), GW: 1.2 kg (2.65lb).
3.3 Accessories
1) User′s Manual -- Instructions on tool operations.
2) CD -- Includes user′s manual, update application and etc.
3) Extension cable -- Connects the scan tool to diagnostic
connector.
4) Diagnostic Connector -- Provides power to the scan tool and
communicates between the tool and vehicle.
5) USB cable -- Used to upgrade the scan tool, and to upload
retrieved data.
6) Carry case – A nylon case to store the scan tool when not in use.
7) Four 1.5V batteries -- Supplies power to the scan tool when
disconnected from vehicle DLC.
3.4 Navigation Characters
Characters used to help navigate the scan tool are:
1) ″►″ -- Indicates current selection.
2) ″$″ -- Identifies the control module number from which the data
is retrieved.
3) ″Graph″ -- Indicates graphic information is available.
4) ″ ″ -- Indicates battery volume when powered by batteries.
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5) ″ ″ -- Scroll bar indicates additional information is available on
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previous or next screens.
3.5 Power
Internal Battery Power
The scan tool has four 1.5V batteries that provide power for off-car
review and analysis. Press
When the″ ″ icon flashes, replace the battery as instructed
in″Battery Replacement″ on paragraph 3.11.
· If the scan tool is stored for a long period of time, remove
batteries to prevent battery leakage from damaging battery
compartment.
External Power
External power of the scan tool is provided via the vehicle Data Link
Connector (DLC). Just follow the steps below to turn on the scan tool:
1) Connect the scan tool and diagnostic connector with the
extension cable supplied.
2) Find DLC on vehicle.
· A plastic DLC cover may be found on some vehicles and you
need to remove it before plugging the OBD II cable.
3) Plug the diagnostic connector to vehicle′s DLC.
power key to turn on the scan tool.
3.6 Obtaining Login Password
CAUTION: The login password is used to get access to software
updates and technical supports from manufacturer or distributors′
websites. DO NOT read the password unless you decide to buy the
scan tool.
1) Install four 1.5V batteries and press
the tool to vehicle DLC to power up the scan tool.
2) From Main Menu, use UP/DOWN button to select Login
Password, and press OK button.
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power key, or connect
…………. Main Manu … … …..
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Diagnostics
System Setup
Tool Information
►Login Password
OK
3) Press OK button to continue.
………….LOGIN PASSWORD…… …..
Do you wish to read
login password?
The password is used
to get access to
software updates and
OK Back
4) A message prompting you to give up reading the password
comes up.
…………….LOGIN PASSWORD……….
Do you wish to
give up reading
login password?
OK Back
5) Press Back button to read password.
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………….LOGIN PASSWORD… … …..
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LOGIN PW: XXXXXXX
Press any key to con.
l If you decide not to read the password, press OK button to
return.
3.7 Product Setup
The scan tool allows you to make the following adjustments and
settings:
1) Language: Selects the desired language.
2) Contrast: Adjusts the contrast of the LCD display.
3) Unit of Measure: Sets the unit of measure to English or Metric.
4) Auto Power-off: Sets automatic power-off time limits.
5) Title Style: Changes display mode between ″with title ″
and ″without title″.
6) Menu Style：Changes selected menu style between ″highlighted″
and ″normal″.
7) Scroll Style：Changes scroll style between ″scroll″ and ″normal″.
8) Button Style：Changes button style between ″highlighted″
and ″normal″
9) Default: Resets the scan tool to factory default settings.
· Settings of the unit will remain until change to the existing
settings is made.
To enter system setup mode
Use UP/DOWN button to select System Setup
Menu and press OK button. Follow the instructions to make
from Main
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adjustments and settings as described in the following setup
…………
.Sy
stem Setup
……………
. .
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options.
………………. .Main Menu………… ……..
Diagnostics
►System Setup
Tool Information
OK
Language Setup
· English is the default language.
1) From System Setup menu, use UP/DOWN button to select
Language, and press OK button.
►Language
Contrast
Unit of Measure
Auto Power-off
Title Style
Menu Style
OK Back
2) Use UP/DOWN button to select the desired language and press
OK button to save your selection and return to previous menu.
……… ……… …Language…… ……. …..
►English
中文
Español
Deutsch
Français
Dutch
OK Back
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Contrast Adjustment
to adjust contrast
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1) From System Setup menu, use UP/DOWN scroll button to select
Contrast, and press OK button.
…………….System Setup…… … ……...
Language
►Contrast
Unit of Measure
Auto Power-off
Title Style
Menu Style
OK Back
2) From Contrast menu, use LEFT/RIGHT scroll button to
decrease or increase contrast.
……… .Contrast……… …
[LEFT] or [RIGHT]
OK Back
Press
3) Press OK button to save your settings and return to previous
menu.
Unit of Measure
· Metric is the default measurement unit.
1) From System Setup menu, use UP/DOWN scroll button to select
Unit of Measure and press OK button.
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…………… ..System Setup…… … …….
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Language
Contrast
►Unit of Measure
Auto Power-off
Title Style
Menu Style
OK Back
2) From Unit of Measure menu, use UP/DOWN scroll button to
select the desired unit of measurement.
……………..Unit of Measure ….…
►Metric
English
OK Back
3) Press OK button to save your selection and return to previous
menu.
Auto Power-off
· The minimum automatic power-off time is 1 minute, and the
maximum is 30 minutes.
· Auto power-off setup can be performed only when the scanner is
powered by AAA batteries.
1) From System Setup menu, use UP/DOWN scroll button to select
Auto Power-off and press OK button.
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………… ……System Setup……… ..
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Language
Contrast
Unit of Measure
►Auto Power-off
Title Style
Menu Style
OK Back
2) From Auto Power-off menu, use UP/DOWN button to change
automatic power-off limits.
……… Auto Power-off …
3 minute (s)
Press
[UP] or [DOWN]
to adjust time
OK Back
3) Press OK button to save your setting and return to previous
menu.
Title Style
· The default title style is ″With Title″.
1) From System Setup menu, use UP/DOWN button to select Title
Style and press OK button.
……………..System Setup…… ………. .
Language
Contrast
Unit of Measure
Auto Power-off
►Title Style
Menu Style
OK Back
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2) From Title Style menu, use UP/DOWN button to select between
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With Title and Without Title.
……………… …Title Style…………… ..
Without Title
►With Title
OK Back
3) Press OK button to save your selection and return to previous
menu.
Menu Style
· The default menu style is ″Normal″.
1) From System Setup menu, use UP/DOWN button to select
Menu Style and press OK button.
……… System Setup ……
Language
Contrast
Unit of Measure
Auto Power-off
Title Style
►Menu Style
OK Back
2) From Menu Style menu, use UP/DOWN button to select menu
style between Highlighted and Normal.
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………… . Menu Style………… …… …
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►Highlighted
Normal
OK Back
3) Press OK button to save your selection and return to previous
menu.
Scroll Style
· The default scroll style is ″Scroll″.
1) From System Setup menu, use UP/DOWN button to select
Scroll Style and press OK button.
…………… System Setup………… …….
► Scroll Style
Button Style
Default
OK Back
2) From Scroll Style menu, use UP/DOWN button to select scroll
style between Scroll and Normal.
……………… Scroll Style…… ……….…
►Scroll
Normal
OK Back
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3) Press OK button to save your selection and return to previous
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menu.
Button Style
· The default button style is ″Highlighted″.
1) From System Setup menu, use UP/DOWN button to select
Button Style and press OK button.
…………… System Setup……… ……..
Scroll Style
►Button Style
Default
OK Back
2) From Button Style menu, use UP/DOWN button to select button
style between Highlighted and Normal.
…………… … .Button Style……… … ….
►Highlighted
Normal
OK Back
3) Press OK button to save your selection and return to previous
menu.
Default
1) From System Setup menu, use UP/DOWN button to select
Default and press OK button.
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……………. System Setup……… … …..
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Scroll Style
Button Style
►Default
OK Back
2) A message comes up asking for your confirmation.
…………… .Default…
Do you wish to reset
the tool to factory
defaults?
OK Back
3) Press OK button to reset the scan tool to factory default settings,
and a ″Reset Done!″ message shows on the screen.
l If you do not wish to reset the tool, press Back button to
return to previous screen.
4) Press any key to return to previous screen.
3.8 Tool Information
The Tool Information function allows viewing of some important
information of the scan tool, such as serial number and login
password.
1) From Main Menu, use UP/DOWN button to select Tool
Information and press OK button.
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……
Tool Information
…
…… … …. Main Menu… ……………
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Diagnostics
System Setup
►Tool Information
OK
2) View tool information on screen.
SERIAL NO: xxxxxxxx
LOGIN PW: xxxxxxxx
OS VERSION: Vx.xxxxx
HW VERSION: Vx.xx
Back
l If the login password has not been read yet, it is not displayed
on the screen.
3.9 Battery Replacement
The scan tool requires four AAA batteries to operate when
disconnected from the vehicle. When the″ ″ icon flashes, replace
batteries as per instructed below:
1) Locate the battery cover on the back of the scan tool.
2) Remove the battery cover screw and slide the battery cover off.
3) Remove discharged batteries and install 4 new AAA batteries.
4) Reinstall battery cover by sliding battery cover on and installing
screw.
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3.10 Vehicle Coverage
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The professional scan tool MaxiDiag
global OBD II/EOBD compliant vehicles but also able to diagnose
non-OBD II compliant vehicles. It is specially designed to read and
clear trouble codes, and to retrieve ECU information of engine,
automatic transmission, ABS and airbag systems for Asian, European
and American vehicles.
For most pre-OBD II vehicles, they do not have standard 16-pin OBD
II DLC (Data Link Connector). You need to have proper diagnostic
connectors to diagnose them.
PRO
MD801 is able to work with
3.11 Product Troubleshooting
Vehicle Linking Error
A communication error occurs if the scan tool fails to communicate
with the vehicle′s ECU (Electronic Control Unit). You need to do the
following to check up:
ü Verify that the ignition is ON.
ü Check if the scan tool′s diagnostic connector is securely
connected to the vehicle′s DLC.
ü Turn the ignition off and wait for about 10 seconds. Turn the
ignition back to on and continue the testing.
ü Verify the control module is not defective.
Operating Error
If the scan tool freezes, then an exception occurs or the vehicle′s ECU
(Electronic Control Unit) is too slow to respond to requests. You need
to do the following to reset the tool:
ü Press and hold POWER button for at least 2 seconds to reset the
scan tool.
ü Turn the ignition off and wait for about 10 seconds. Turn the
ignition back to on and continue the testing.
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