Laser 5091 User manual

www.lasertools.co.uk
5091
Laser 5091
OBDII/EOBD Code Reader
The CAN OBDII/EOBD Code Reader is an innovative and affordable
solution specially designed for the owner to get easy and quick
access to engine problems on all OBDII compliant petrol vehicles
(2001<) and diesel vehicles (2004<) sold worldwide.
Instructions

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Safety Information
For your own safety and the safety of others, and to prevent damage to the equipment and
vehicles, read this manualthoroughly before operating your code reader. The safety messages
presented below and throughoutthis user’s manual are reminders tothe operator to exercise
extreme care when using this device. Always refer to and follow safety messages and test
procedures provided by vehicle manufacturer. Read, understand and follow all safety messages
and instructions in this manual.
Safety Message Conventions Used
We provide safety messages to help prevent personal injury and equipment damage. Below are
signal words we used to indicate the hazard level in a condition.
Indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury to the operator or to bystanders.
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury to the operator or to bystanders.
Indicates a potentially hazardous situation which, if not avoided, may result in moderate or minor
injury to the operator or to bystanders.
Important Safety Instructions
And always use your code reader as described in the user’s manual, and follow all safety
messages.
●Do not route the test cable in a manner that would interfere with driving controls.
●Do not exceed voltage limits between inputs specified in this user’s manual.
●Always wear ANSI approved goggles to protect your eyes from propelled objects as well as hot
or caustic liquids.
●Fuel, oil vapors, hot steam, hot toxic exhaust gases, acid, refrigerant and other debris produced
by a malfunction engine can cause serious injury or death. Do not use the code reader in areas
where explosive vapor may collect, such as in below-ground pits, confined areas, or areasthat
are less than 18 inches (45 cm) above the floor.
●Do not smoke, strike a match, or cause a spark near the vehicle while testing and keep all
sparks, heated items and open flames away from the battery and fuel / fuel vapors as they are
highly flammable.
●Keep a dry chemical fire extinguishersuitable for gasoline,chemical and electrical fires in work
area.
●Always be aware of rotating parts that move at high speed when an engine is running and keep
a safe distance from these parts as well as other potentially moving objects to avoid serious
injury.
●Do not touch engine components that get very hot when an engine is running to avoid severe
burns.
●Block drive wheels before testing with engine running. Put the transmission in park (for
automatic transmission) or neutral (for manual transmission). And never leave a running engine
unattended.
●Do not wear jewellry or loose fitting clothing when working on engine.
SAFETY INFORMATION..................................................................................................................... 4
SAFETY MESSAGE CONVENTIONS USED ............................................................................................. 4
IMPORTANT SAFETY INSTRUCTIONS .................................................................................................... 4
1 USING THIS MANUAL ..................................................................................................................... 7
1.1 BOLD TEXT ................................................................................................................................. 7
1.2 SYMBOLS AND ICONS ................................................................................................................... 7
1.2.1 Solid Spot........................................................................................................................... 7
1.2.2 Arrow Icon.......................................................................................................................... 7
1.2.3 Note and Important Message ............................................................................................. 7
2 INTRODUCTION .............................................................................................................................. 7
2.1 CODE READER DESCRIPTIONS ...................................................................................................... 8
2.2 ACCESSORY DESCRIPTIONS ......................................................................................................... 8
2.3 TECHNICAL SPECIFICATIONS......................................................................................................... 9
3 GETTING STARTED ........................................................................................................................ 9
3.1 PROVIDING POWER TO CODE READER........................................................................................... 9
3.1.1 Connecting to Vehicle Power ............................................................................................. 9
3.1.2 Connecting to Personal Computer with USB Cable ............................................................ 9
3.2 APPLICATION OVERVIEW .............................................................................................................. 9
4 OBDII/EOBD OPERATIONS .......................................................................................................... 10
4.1 READ CODES ............................................................................................................................ 11
4.2 ERASE CODES........................................................................................................................... 13
4.3 LIVE DATA................................................................................................................................. 14
4.3.1 View Data......................................................................................................................... 14
4.3.2 Record Data..................................................................................................................... 17
4.3.3 Playback Data.................................................................................................................. 20
4.4 FREEZE FRAME ......................................................................................................................... 21
4.5 READ I/M READINESS STATUS DATA ........................................................................................... 22
4.6 O2 MONITOR TEST .................................................................................................................... 25
4.7 ON-BOARD MONITOR TEST ........................................................................................................ 26
4.8 COMPONENT TEST..................................................................................................................... 29
4.9 REQUEST VEHICLE INFORMATION ............................................................................................... 29
4.10 MODULES PRESENT................................................................................................................. 30
5 DTC LOOKUP ................................................................................................................................ 31
6 REVIEW DATA............................................................................................................................... 32
7 SYSTEM SETUP ............................................................................................................................ 33
7.1 SELECT LANGUAGE.................................................................................................................... 33
7.2 CONFIGURE MONITORS.............................................................................................................. 34
Table of Contents

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7.2.1 Spark IGN Required Monitors........................................................................................... 35
7.2.2 Compression IGN Required Monitors ............................................................................... 36
7.2.3 Allowed INC Monitors....................................................................................................... 37
7.2.4 Reset Factory Default....................................................................................................... 38
7.3 UNIT OF MEASURE..................................................................................................................... 38
7.4 KEY BEEP SET .......................................................................................................................... 39
7.5 DIAG BEEP SET ......................................................................................................................... 40
7.6 TOOL SELF-TEST ....................................................................................................................... 41
7.6.1 Display Test ..................................................................................................................... 41
7.6.2 Keypad Test..................................................................................................................... 41
7.6.3 LED Test.......................................................................................................................... 42
8 TOOL INFORMATION .................................................................................................................... 43
9 PRINTING AND UPDATE .............................................................................................................. 44
9.1 UPDATE THE CODE READER ....................................................................................................... 44
9.2 PRINTING DATA ......................................................................................................................... 45
9.3 SEARCHING DTC....................................................................................................................... 47
9.4 USER MANUAL ........................................................................................................................... 47
9.5 UPDATE TOOL SETTINGS ............................................................................................................ 48
1 Using This Manual
Below are the conventions we use in this manual:
1.1 Bold Text
Bold text is used to highlight selectable items such as buttons and menu options.
Example:
Press the ENTER button to select.
1.2 Symbols and Icons
1.2.1 Solid Spot
Operation tips and lists that apply to specific tool are introduced by a solid spot●.
Example:
When System Setup is selected, a menu that lists all available options displays. Menu options
include:
Languages.
Configure monitors
Unit of measure.
Key Beep Set
Diag Beep Set
Tool self-test
1.2.2 Arrow Icon
An arrow icon indicates a procedure.
Example:
To change menu language:
1. Use the UP/DOWN key to highlight Language on the menu.
2.Press the ENTER button to select.
1.2.3 Note and Important Message
Note:
A NOTE provides helpful information such as additional explanations, tips, and comments.
Example:
NOTE:
Test results do not necessarily indicate a faulty component or system.
Important
IMPORTANT indicates a situation which, if not avoided, may result in damage to the test
equipment or vehicle.
Example:
IMPORTANT:
Do not soak keypad as water might find its way into the code reader.
2 Introduction
The LASER 5091 is an OBDII and EOBD code reader; it is specially designed to support all 10 OBDII
service modes, including live data, O2 sensor test and more, on OBDII/EOBD compliant cars, SUVs,
and light commercial vehicles sold worldwide since 2001 (petrol engines) / 2004 (diesel engines).

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Figure 2-1 Front View
A. OBD II Cable - provides communication for vehicle DLC.
B. LCD Display - shows menus, test results and operation tips.
C. Green LED Display - indicates the engine system is working normally (all monitors on the
vehicles are active and performing their diagnostic testing), and no DTCs are found.
D. Yellow LED Display - shows the tool finds a possible problem. Pending DTCs exist or/and
some of the vehicle’s emission monitors have not run their diagnostic testing.
E. Red LED Display - indicates there are some problems in one or more of the vehicle’s systems.
In this case, the MIL lamp on the instrument panel is on.
F. UP Key - quick access to the Read Codes function before going to diagnostic menu and moves
selection up. When looking up DTC, it is used to change value of selected character.
G. DOWN Key - Quick access to the Clear Codes function before going to diagnostic menu and
moves selection down. When looking up DTC, it is used to change value of selected character.
H. LEFT SCROLL KEY - goes to previous character when looking up DTCs. Scrolls back and
forth through codes found and through different screens of data. Also it is used to make
selection of PIDs when viewing custom PID list, and to view PID graphs.
I. RIGHT SCROLL KEY - goes to next character when looking up DTCs. Scrolls back and forth
through codes found and through different screens of data. Also it is used to cancel all
selections of PIDs when viewing custom PID list.
J. One Click I/M Readiness Key - quick checks state emissions readiness and drive cycle
verification.
K. BACK Key - cancels an action and returns to previous screen or level.
L. ENTER Key - confirms an action or movement and moves to next level.
M. Power Switch - reboot the code reader
N. HELP Key - accesses to the Help function and it is also used to update the code reader when
long pressed.
O. USB Port – provides a USB connection between the code reader and PC or laptop.
2.2 Accessory Descriptions
This section lists the accessories that go with the code reader. If you find any of the following
items missing from your package, contact your local dealer for assistance.
2.1 Code Reader Descriptions 1 User’s Guide - provides operation instructions for the usage of the code reader.
2 USB Cable - provides connection between the code reader and a computer to upgrade the tool.
3 Software CD – includes the user’s manual, NT Wonder update software and update files.
2.3 Technical Specifications
Display : 2.8" TFT colour display
Working Temperature : 0 to 60ºC (32 to 140ºF)
Storage Temperature : -20 to 70ºC (-4 to 158ºF)
Power Supply : 8-18V vehicle power
Supported Protocols: J1859-41.6, J1850-10.4, ISO9141, KWP2000 (ISO 14230), and CAN
(Control Area Network ISO 11898)
Dimensions ( L*W*H): 145*94*32mm
Weight : 0.6kg
3 Getting Started
This section describes howto provide power tothe code reader, provides brief introductions of
applications loaded on the code reader and display screen layout and illustrates howto input text
and numbers with the code reader.
3.1 Providing Power to Code reader
Before using the code reader, make sure to provide power tothe code reader.
The unit operates on any of the following sources:
12-volt vehicle power
USB connection to personal computer.
3.1.1 Connecting to Vehicle Power
The code reader normally powers on whenever it is connected tothe data link connector (DLC).
To connect to vehicle power:
1. Locate the data link connector (DLC). The DLC is generally located underthe dash on the
driver side of the vehicle.
2. Connect the code reader with the DLC.
3. Switch the ignition key tothe ON position.
4. The code reader automatically boots up.
IMPORTANT
Never try to provide power for the code reader from USB connection when the code reader is
communicating with a vehicle.
3.1.2 Connecting to Personal Computer with USB Cable
The code reader also receives power through the USB port when it is connected to a PC for
updating software and transferring saved files.
To connect to PC:
1. Insert the small end of the USB cable to the USB port at the right side of the code reader and
the large end to a computer.
2. Press the power switch of the code readerto power it on.
3.2 Application Overview
When the code reader boots up, the Home screen opens. This screen shows all applications
loaded on the unit.
Following applications are preloaded into the code reader:

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Diagnostics – leads to OBDII screens for all 9 generic OBD system tests.
DTC Lookup – leads to screens for diagnostic trouble code lookup.
Review Data – leads to screens for access to tested data files.
Print Data – leads to screens for access to printing function
About – leads to screen that shows information about the code reader.
Setup – leads to screens for adjusting default settings to meet your own preference when
using the code reader.
Figure 3.1 Sample Home Screen
4 OBDII/EOBD Operations
OBD-II/EOBD menu lets you access all OBD service modes. According to ISO 9141-2, ISO
14230-4, and SAE J1850 standards, the OBD application is divided into several sub programs,
called ‘Service $xx’. Below is a list of OBD diagnostic services:
●Service $01 - request current powertrain diagnostic data
●Service $02 - request powertrain freeze frame data
●Service $03 - request emission-related diagnostic trouble codes
●Service $04 - clear/reset emission-related diagnostic information
●Service $05 - request oxygen sensor monitoring test results
●Service $06 - request on-board monitoring test results for specific monitored systems
●Service $07 - request emission-related diagnostic trouble codes detected during current or
last completed driving cycle
●Service $08 - request control of on-board system, test or component
●Service $09 - request Vehicle Information
●Service $0A - request Emission related DTCs with permanent status
When Diagnostics application is selected from Home screen, the code reader starts to detect the
communication protocol automatically. Once the connection has established, a menu that lists all
of the tests available on the identified vehicle displays. Menu options typically include:
●Read Codes
●Freeze Frame Data
●Erase Codes
●Live Data
●I/M Readiness
●O2 Sensor Test
●On-board Monitor Test
●Component Test
●Vehicle Information
●Modules Present
●Unit of measure
NOTE:
Not all function options listed above are applicable to all vehicles. Available options may vary by
the year, model, and make of the test vehicle. A “The selected mode is not supported!” message
displays if the option is not applicable to the vehicle under test. When the code reader links to
vehicle, it checks the status of I/M Monitors automatically, and gives a summary report on the
display as illustrated below.
The following applications are preloaded into the code reader:
Figure 4-1 Sample System Status Screen
NOTE:
If vehicle is equipped with more than one computer module (for example a powertrain control
module [PCM] and a transmission control module [TCM]), the code reader identifies them by their
identification names (ID) assigned by manufacturer (i.e. Engine or Module $A4).
A screen with prompted information to erase the previously stored data in order to save the data
from this test displays as below.
Figure 4-2 Sample Erase the Previous Stored Data Screen
If previous data is to be erased, select Yes; if data is not to be erased, Use the LEFT/RIGHT key
to pick No. Wait a few seconds to return to Diagnostic Menu.
NOTE:
If no data is stored in the code reader, the above screen will not show up.
4.1 Read Codes
Read Codes menu lets you read stored codes, pending codes and permanent doesfound in the
control unit. Typical menu options include:
●Stored Codes
●Pending Codes
●Permanent Codes
Diagnostic trouble codes stored in a control module are used to help identify the cause of a
trouble or troubles with a vehicle. These codes have occurred a specific number of times and
indicate a problem that requires repair.
Pending codes are referred to as maturing codesthat indicate intermittent faults. If the fault does
not occur within a certain number of drive cycles (depending on vehicle), the code clears from
memory. If a fault occurs a specific number of times, the code matures into a DTC and the MIL
illuminates or blinks.
Permanent Codes are DTCs that are "confirmed" and are retained in the non-volatile memory of
the computer until the appropriate monitor for each DTC has determined thatthe malfunction is
no longer present and is not commanding the MIL on. Permanent DTC shall be stored in

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non-volatile memory and may not be erased by any diagnostic services or by disconnecting
power to ECU.
There are two ways to read codes using 5091.
●Press the Readhot key to read codesfrom home screen.
●Traditional way: select Read Codes from the diagnostic menu.
To read codes from a vehicle:
1. Press the Read hot key to directly read the codes from home screen. Or scroll with the
UP/DOWN key to highlight Read Codes from Diagnostic Menu and press the ENTER key.
Figure 4-3 Sample Diagnostic Menu Screen
2. Select Stored Codes/Pending Codes/ Permanent Codes and press the ENTER key to
confirm.
Figure 4-4 Sample Read Codes Screen
3. A code list including code number and its description displays.
Figure 4-5 Sample DTC Description Screen
NOTE:
If no DTCs are present, the message “No (Pending) Codes Found!” is displayed. If any
manufacturer specific or enhanced codes detected, 5091 reads the correct DTC information
automatically according tothe VIN.
4.2 Erase Codes
Erase Codes menu lets you to clear all current and stored DTCs from the control module. Also it
erases all temporary ECU information, including freeze frame. So make sure that the selected
system are completely checked and serviced by technicians and no vital information will be lost
before clearing codes.
There are two ways to erase codes:
●Press the Erase hotkey to erase codesfrom home screen.
●Traditional way: select Erase Codesfrom the diagnostic menu.
NOTE:
●To clear codes, make sure thatthe ignition key is switchedto ON with the engine off.
●Erase Codes does not fix the problem that caused the fault! DTCs should only be erased after
correcting the condition(s) thatcaused them.
To clear codes:
1. Press the Erase hot key to directly erase the codesfrom the home menu. Or use the
UP/DOWN key to highlight Erase Codes from Diagnostic Menu and press the ENTER key.
Figure 4-6 Sample Diagnostic Menu Screen
2. Follow the on-screen instructions and answer questions about the vehicle being tested to
complete the procedure.
Figure 4-7 Sample Erase Codes Screen
3. Check the codes again. If any codes remain, repeatthe Erase Codes steps.

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4.3 Live Data
Live Data menu lets you view, record and playback real time PID data from the electronic control
module.
Menu options typically include:
●View Data
●Record Data
●Playback Data
4.3.1 View Data
The View Data function allows real time viewing of the vehicle’s electronic control unit’s PID data,
including sensor data, operation of switches, solenoids and relays.
Menu options typically include:
●Complete Data
●Custom Data
●Unit of measure (Please refer to Chapter 7 System Set up)
4.3.1.1 Complete Data Set
Complete Data Set displays all supported PIDs of the vehicle being tested.
To view all live PID data:
1. Use the UP/DOWN key to highlight Live Data from Diagnostic Menu and press the ENTER
key.
Figure 4-8 Sample Diagnostic Menu Screen
2. Select View Data from the list and press ENTER key to confirm.
Figure 4-9 Sample Live Data Menu Screen
3. Select Complete Data Set from the menu and press the ENTER key to display the datastream
screen.
Figure 4-10 Sample View Data Menu Screen
4. Scroll with the up and down arrow keys to scroll through data to select lines, and left and right
arrow keys to scroll back and forth through different screens of data.
Figure 4-11 Sample Complete List Screen
5. Press the ENTER key to view PID graph if the PID gives a numeric reading.
Figure 4-12 Sample PID Graph Screen
6. Use the BACK key to return to diagnostic menu.

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Figure 4-13 Sample Live Data Menu Screen
2. The custom datastream selection screen displays.
Figure 4-14 Sample Custom Datastream Selection Screen
3. Use the RIGHT key to select or deselect a line or press LEFT key to deselect all if needed .
Press the ENTER key to confirm and BACK key to cancel.
Figure 4-15 Sample Custom Datastream Screen
4. When finished selection, press the ENTER key to display selected items.
4.3.1.2 Custom Data List
Custom Data List menu lets you to minimize the number of PIDs on the data list and focus on any
suspicious or symptom-specific data parameters.
To create a custom data list:
1. Select Custom List from the menu and press the ENTER key.
Figure 4-16 Sample Datastream Screen
4.3.2 Record Data
The Record Data function is used to record PIDs to help diagnose intermittent drivability problems that
can’t be determined by any other method.
Menu options typically include:
●Complete Data
●Custom Data
●Unit of measure (Please refer to Chapter 7 Set Up)
NOTE
There are two types of trigger methods used.
●Manual Trigger---triggers recording whenever operators press the ENTER key.
●DTC trigger--- automatically triggers recording when a code is detected by vehicle. DTC Trigger
is not available on all vehicles. Some vehicles need to be driven for a long period of time to store
a code after a drivability fault occurs. If DTC trigger is selected to make a recording, there might
not be drastic change in the data before and after trigger.
Do not operate the code reader while driving; always have two persons in vehicle when recording – one
to drive and the other to operate the code reader.
To record data:
1. Select Record data from the menu and press the ENTER key.
Figure 4-17 Sample Live Data Menu Screen
2. Refer toView Data to set up Complete Data Set or Customer Data Set to record.

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Figure 4-18 Sample Record Data Menu Screen
3. Scroll with the up and down arrow keys to pick a trigger mode and press the ENTER key to
confirm.
Figure 4-19 Sample Pick Trigger Mode Screen
4. Use the UP/DOWN key to select a memory location and press ENTER to confirm.
Figure 4-20 Sample Select Memory Screen
NOTE
The asterisk (*) on the screen indicates that a recording currently exists in this memory location.
If an area with an asterisk (*) was picked, a message prompting to erase data displays.
Figure 4-21 Sample Erase Recording Screen
5. If the recording is to be overwrited, selected Yes; if data is notto be overwrited, pick No to
return to Select Memory screen and choose another one.
6. If Manual Trigger is selected, following screen displays:
Figure 4-22 Sample Manual Trigger Recording Screen
7. If DTC Trigger is picked, following screen displays:
Figure 4-23 Sample DTC Trigger Recording Screen
8. Press the ENTER key to start recording or wait codestotrigger.

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Figure 4-24 Sample Recording Screen
NOTE
Different vehicles communicate at different speeds and support a different number of PIDs.
Therefore, the maximum number of frames that can be recorded varies. The code reader keeps
recording data until
●the memory is full.
●the operator presses the BACK key.
9. After recording, the code reader displays a prompt to Playback.
Figure 4-25 Sample Record Data Screen
10. Select YES to view recorded data; pick NO or press the BACK key to return to Record Data.
4.3.3 Playback Data
The Playback Data is used to playback recorded PID data.
To playback data:
1. Scroll with the up and down arrow key to select Playback Data from the Menu.
Figure 4-26 Sample Record Data Screen
2. Use the UP/DOWN key to select a memory area that is marked with an asterisk (*) and press
the ENTER to confirm.
Figure 4-27 Sample Record Data Screen
3. Press the UP/DOWN key to view recorded PIDs of each frame. Press the BACK key to exit.
Figure 4-27 Sample Record Data Screen
4.4 View Freeze Frame
Freeze Frame menu displays freeze frame data, asnapshot of critical vehicle operating
conditions automatically recorded by the on-board computer at the time of the DTC set. It is a
good function to help determine what caused the fault.
To view freeze frame data:
1. Select View Freeze Frame from the Diagnostic Menu. Details of freeze frame data displays.
Figure 4-28 Sample Diagnostic Menu Screen
2. Use the up and down arrow keys to scroll through data to select lines, and left and right arrow
keys to scroll back and forth through different screens of data. If no freeze frame detected,the
message “No freeze frame data stored!” is displayed.

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Figure 4-29 Sample Freeze Data Screen
3. Use the BACK key to return to Diagnostic Menu。
4.5 Read I/M Readiness Status Data
I/M Readiness option allows to view a snapshot of the operations for the emission system on
OBDII/EOBD vehicles.
I/M Readiness is a useful function used to check if all monitors are OK or N/A. The vehicle’s
computer performs tests on the emission system during normal driving conditions. After a specific
amount of drive time (each monitor has specific driving conditions and time required), the
computer’s monitors decide if the vehicles emission system is working correctly.
When the monitor’s status is:
●OK - vehicle was driven enough to complete the monitor.
●INC (Incomplete) - vehicle was not driven enough to complete the monitor.
●N/A (Not Applicable) - vehicle does not support that monitor.
There are two types of I/M Readiness tests:
●Since DTCs Cleared - shows status of the monitors since the DTCs were last cleared.
●This Drive Cycle - shows status of monitors since the start of the current drive cycle.
Below is a list of abbreviations and names of OBD II monitors supported by the code reader.
No.
Abbreviation
Name
1
Misfire Monitor
Misfire Monitor
2
Fuel System Mon
Fuel System Monitor
3
Comp. Component
Comprehensive Components Monitor
4
Catalyst Mon
Catalyst Monitor
5
Htd Catalyst
Heated Catalyst Monitor
6
Evap System Mon
Evaporative System Monitor
7
Sec Air System
Secondary Air System Monitor
8
A/C Refrig Mon
Air Conditioning Refrigerant Monitor
9
Oxygen Sens Mon
Oxygen Sensor Monitor
10
Oxygen Sens Htr
Oxygen Sensor Heater Monitor
11 EGR System Mon
Exhaust Gas Recirculation System
Monitor
There are two ways to retrieve I/M Readiness Status data:
●One-click I/M readiness key
●Typical way: select I/M Readiness from Diagnostic Menu
NOTE
●To review I/M Readiness status, make sure that the ignition key is switched to ON with the
engine off.
●Not all monitors are supported by all vehicles.
To retrieve I/M Readiness Status data by one-click I/M readiness key:
1. Press the One-Click I/M Readiness Key on the keypad and the following screen displays.
Figure 4-30 Sample Diagnostic Menu Screen
2. Colored LED and build-in beeper provide both visual and audible reminders for emission
check and DTCs. Below is the intepretation of the LED and build-in beeper.
When the LED is :
●Green - Indicates that engine systems are “OK” and working properply (the number of
Monitors equipped with the vehicle which have run and performed their self-diagnostic
testing is in the allowed range. MIL is off. ).No stored and pending DTCs exist. The
vehicle is readyfor an Emissions Test.
●Yellow - The toolfinds a possible problem. It indicates the following two conditions:
(1) Pending DTCs exist. Please check the I/M Readiness test result screen and use the
Read Codes function to view detailed codes information.
(2) Some of the vehicle’s emission monitors have not working properly. If the I/M
Readiness screen shows no DTC (including pending DTC), butthe Yellow LED is
still illuminated, it indicate a “Monitor Has Not Run” status.
●Red - Indicates some problems exist with one or more of the vehicle’s system, and the
vehicle is not ready for an Emissions Test. As well there are DTCs found. The MIL lamp
on the vehicle’s instrument panel will light steady. The problem that is causing the
illumination of Red LED should be fixed before an Emissions Test or driving the vehicle
further.
The built-in beeper works with the colored LED simultaneous, as an assistance to reflect the I/M
Readiness test results:
●Green - two long beeps.
●Yellow - short, long, short beeps.
●Red - four short beeps.
NOTE
The built-in beeper which makes differenttones corresponding to different LED indicators is
invaluable when the test is performed while driving or in bright areas where LED illumination
may not be visible.
To retrieve I/M Readiness Status data by typical way:
1. Scroll with UP/DOWN key to highlight I/M Readiness from Diagnostic Menu and press the
ENTER key. If vehicle supports both types of monitors, a screen for monitor type selection
displays. Select a monitor type and press the ENTER key.

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Figure 4-31 Sample Diagnostic Menu Screen
2. If the vehicle being tested supports both types of monitors, following screen displays.
Figure 4-29 Sample I/M Readiness Screen
3. Depending on readiness test, one of these 2 screens will be present. Use the up and down
arrow keys to scroll through data. Press the BACK key to exit.
Figure 4-32 Sample IM Readiness Screen 1
Or
Figure 4-33 Sample IM Readiness Screen 2
4.6 O2 Monitor Test
OBD II regulations require certain vehicles monitor and test oxygen (O2) sensors to isolate fuel
and emissions related faults. The O2 Monitor Test function is used to retrieve completed O2
sensors monitor test results.
The O2 Monitor Test is not an on-demandtest. O2 sensors are not tested when selected via the
menu but tested when engine operating conditions are within specified limits.
If the vehicle uses a controller area network (CAN) protocol to communicate, this function is not
supported by vehicle. Refer to “On-Board Monitor Tests” on page 38-39 for O2 monitor data of
CAN-equipped vehicles.
To retrieve O2 monitor data:
1. Use the UP/DOWN key to highlight O2 Monitor Testfrom Diagnostic Menu and press the
ENTER key. A screen with a list of available sensors displays.
Figure 4-34 Sample Diagnostic Menu Screen
2. Use the UP/DOWN key to highlight an O2 sensor and press the ENTER key to confirm. A
screen with details of the selected sensor displays.

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Figure 4-35 Sample O2 Monitor Test screen
3. Use the up and down arrow keys to scroll through data to select lines, and left and right arrow
keys to scroll back and forth through different screens of data.
Figure 4-36 Sample O2 Bank1 Sensor 1 Screen
4. Press ENTER key to view data of selection.
Figure 4-37 Sample data of $81 screen
5. Press the BACK key to exit and return.
4.7 On-Board Monitor Test
The On-Board Monitor Test function is useful after servicing or after clearing a vehicle ECU’s
memory. It receives test results for emission-related powertrain components and systems that
are not continuously monitored for Non-CAN vehicles. And for CAN vehicles, it receives test data
for emission-related powertrain components and systems that are and are not continuously
monitored. It is vehicle manufacturer who is responsible for assigning test and component IDs.
NOTE
Test results do not necessarily indicate a faulty component or system.
To request on-board monitor test results:
1. Use the UP/DOWN key to highlight On-Board Monitor Testfrom Diagnostic Menu and press
the ENTER key.
Figure 4-38 Sample Diagnostic Menu Screen
2. Depending on the protocol the vehicle used, one of these 2 screens shows.
Figure 4-39 Sample Non-CAN Vehicle Test Screen
Or
Figure 4-40 Sample CAN vehicle test screen
3. Use the UP/DOWN key to highlight a test group and press the ENTER key to confirm. A screen
with details of the selected sensor displays. Use the up and down arrow keys to scroll through
data to select lines, and left and right arrow keys to scroll back and forth through different
screens of data.
For non-CAN vehicles, test screen is as illustrated on next page:

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Figure 4-41 Sample Non-CAN vehicle test screen
For CAN vehicles, test screen is illustrated below:
For non-CAN vehicles, test screen is illustrated below:
Figure 4-42 Sample Can vehicle test screen
4. Press the BACK key to exit and return.
4.8 Component Test
Component Test allows the code readerto control operation of vehicle components, tests or
systems.
NOTE
●Some manufacturers do not allow tools to control vehicle systems.
●The manufacturer sets the criteria to automatically stop test. Refer to appropriate vehicle service
manual before using this function.
To perform a component test:
1. Use the UP/DOWN key to highlight Component Testfrom Diagnostic Menu and press the
ENTER key. A screen with a list of available tests displays.
Figure 4-43 Sample Diagnostic Menu Screen
2. Use the UP/DOWN key to highlight a system or component, press the ENTER key to start test
and the code reader displays the message “Command Sent!”.
Figure 4-44 Sample Componenttest screen
3. Press the BACK key to exit and return.
4.9 Request Vehicle Information
Vehicle Information allows to request the vehicle’s VIN number, calibration ID(s) which identifies
software version in vehicle control module(s), calibration verification numbers (CVN(s)) and
in-use performance tracking on model year 2000 and newer OBD II compliant vehicles.
CVNs are calculated values required by OBD II regulations. They are reported to check if
emission-related calibrations have been changed. Multiple CVNs may be reported for a control
module. It may take several minutes to do the CVN calculation. In-use performance tracking
tracks performance of key readiness monitors.
NOTE
Available options will vary depending on the vehicle under test.

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To request vehicle information:
1. Use the UP/DOWN key to highlight Vehicle Info. from Diagnostic Menu and press the ENTER
key.
Figure 4-45 Sample Diagnostic Menu Screen
2. Follow on-screen instruction and send the commandto read vehicle information. A screen with
a list of available options displays.
Figure 4-46 Sample Vehicle Info Screen
3. Use the UP/DOWN key to highlight an available option and press the ENTER key. A screen
with details of the selected option displays.
Figure 4-47 Sample Calibration ID Screen
4. Press the BACK key to exit and return.
4.10 Modules Present
The code reader identifies module IDs and communication protocols for OBD2 modules in the
vehicle.
To view module IDs and communication types:
1. Use the UP/DOWN key to highlight Modules Present from Diagnostic Menu and press the
ENTER key.
Figure 4-48 Sample Diagnostic Menu Screen
2. A screen with the module IDs and protocols displays.
Figure 4-49 Sample Module Present Screen
3. Press the BACK key to exit and return.
5. DTC Lookup
DTC Lookup menus allows to request DTC definitions stored in the code reader.
To Look up DTCs:
1. Use the LEFT/RIGHT key to highlight DTC Lookup from Home Screen and press the ENTER
key.
Figure 5-1 Sample Home Screen
2. Use the LEFT/RIGHT key to select the desired character, then press the UP/DOWN key to
change the digit you wantto enter a valid code number. Press the ENTER key to confirm.

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Figure 5-2 Sample DTC Lookup Screen
3. A screen with code number and its definition displays. If definition could not be found (SAE or
Manufacturer Specific), the code reader displays “DTC definition not found! Please refer to
vehicle service manual!” If a P1xxx, C1xxx, B1xxx or U1xxx code is entered, select a vehicle
make to look for DTC definitions. Press the BACK key to exit.
Figure 5-3 Sample Trouble Codes Screen
6 Review Data
The Playback option leads to screens for review of recorded test results.
To review recorded data:
1. Use the LEFT/RIGHT key to highlight Review Data from home screen and press the ENTER
key.
Figure 6-1 Sample Home Screen
2. A screen with a list of test records displays. If no data is recorded,the message “No Data
available!” is displayed.
Figure 6-2 Sample Playback Screen
3. Use the UP/DOWN key to highlight an optional record and press the ENTER key. Details of the
test record displays. View and analysis the recorded information, then press BACK to exit.
7 System Setup
This section illustrates howto program the code reader to meet your specific needs.
When Setup application is selected, a menu with available service options displays. Menu options
typically include:
●Language
●Configure monitors
●Unit of measure
●Key Beep Set
●Diag Beep Set
●Tool self-test
7.1 Select Language
Selecting Language opens a screen that allows you to choose system language.
To configure system language:
1. Use the LEFT/RIGHT key to highlight Setup from home screen and press the ENTER key.
Figure 7-1 Sample Home Screen

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Figure 7-2 Sample Setup Screen
3. Press the UP/DOWN key select a language and press the ENTER key to confirm. Press the
BACK key to exit and return.
Figure 7-2 Sample Language Selection Screen
7.2 Configure Monitors
This menu allows the users to configure the monitors required to test spark ignition and
compression ignition, the number of monitors to pass diagnosis, and restore the default settings.
Menu options typically include:
●Spark IGN Required Monitors
●Compression IGN Required Monitors
●Allowed INC Monitors
●Reset Factory Default
There are two different types of monitors: continuous and non-continuous. Continuous monitors
are different in design from the non-continuous monitors. Continuous monitors are being
constantly tested and evaluated by the car’s computer while the car is running. Conversely, the
non-continuous monitors require certain conditions to be met before a test or series of tests can
be completed.
Continuous Monitors:
●Misfire
●Fuel System
●Comprehensive Component
Non-Continuous Monitors:
NOTE
Non-continuous monitors are different for spark ignition cars (petrol / gasoline engines) and
compression ignition cars (diesel engines).
2. A screen of a list of menu options displays.
●Heated Catalyst
●Evaporative (EVAP) System
●Secondary Air System
●Oxygen (O2) Sensor
●Oxygen Sensor Heater
●EGR (Exhaust Gas Recirculation) and/or VVT System
Compression ignition vehicles (Diesel)
●NMHC Catalyst
●NOx/SCR After treatment
●Boost Pressure
●Exhaust Gas Sensor
●PM Filter
●EGR and/or VVT System
To configure monitors:
1. Use the UP/DOWN key to highlight Configure Monitors from Setup menu and press the
ENTER key to confirm.
Figure 7-3 Sample Setup Screen
2. A screen with the optional monitors to be configured displays.
Figure 7-4 Sample Configure Monitors Display
7.2.1 Spark IGN Required Monitors
In this menu, the operators can configure monitors for spark ignition cars (gasoline engines).
To configure spark IGN required monitors:
1. Use the UP/DOWN key to highlight Spark IGN Required Monitors from menu and press the
ENTER key to confirm.
2. The custom monitors selection screen displays.
Spark ignition vehicles (Petrol / Gasoline)
●Catalyst (CAT)

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Figure 7-5 Sample Custom Monitors Selection Screen
3. Use the RIGHT key to select or deselect a monitor or press the LEFT key to deselect all the
monitors. Press the ENTER key to confirm and BACK key to cancel.
Figure7-6 Sample Spark IGN Required Monitors Selection Screen
NOTE
The numbertothe upper right corner of display indicates the total number of optional monitors
and sequence of currently selected monitor.
7.2.2 Compression IGN Required Monitors
In this menu,the operators can configure monitors for compression ignition cars (diesel engines).
To configure spark compression required monitors:
1. Use the UP/DOWN key to highlight Compression IGN Required Monitors from the menu and
press the ENTER key to confirm.
Figure 7-7 Sample Configure Monitors Display
2. The custom monitors selection screen displays and Use the RIGHT key to select or deselect a
monitor or press the LEFT key to deselect all the monitors. Press the ENTER key to confirm and
BACK key to cancel.
Figure7-8 Sample Spark IGN Required Monitors Selection Screen
7.2.3 Allowed INC Monitors
Emissions tests vary depending on the geographic or regional area in which the vehicle is registered.
5091 provides a more flexible way to meet different standards, which allows the user to select 0, 1, 2,
3 INC monitors in test.
To configure allowed INC monitors:
1. Use the UP/DOWN key to highlight Allowed INC Monitors from the menu and press the ENTER
key to confirm.
Figure7-8 Sample Configure Monitors Selection Screen
2. The custom INC monitors selection screen displays and scroll with the up and down arrow keys to
select. Press the ENTER key toconfirm and BACK key to cancel.
Figure 7-9 Sample Allowed INC Monitors Selection Screen

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7.2.4 Reset Factory Default
This menu will allow the users to restore the default configuration settings in the Configure Monitors
menu, and delete any customized settings. In this case, it will include all the available monitors for the
Spark IGN Required Monitors and Compression IGN Required Monitors. Still the Allowed INC
Monitors will be set to 1.
To reset factory default:
1. Use the UP/DOWN key to highlight Reset Factory Default from the menu and press the ENTER
key to confirm.
Figure7-10 Sample Configure Monitors Selection Screen
2. A message prompting to reset factory default displays. Answer Yes to confirm the request or
answer No to abort and return.
Figure7-11 Sample Reset Factory Default Screen
7.3 Unit of measure
Unit of measure opens a dialog boxthat allows you to choose between US customary or metric
units of measure.
To change the unit setup:
1. Scroll the UP/DOWN keys to highlight Unit of Measure from Setup menu and press the
ENTER key.
Figure 7-12 Sample Setup Screen
2. Press the UP/DOWN arrow key select an item and press the ENTER key to save and return.
Figure 7-13 Sample Unit Selection Screen
7.4 Key Beep Set
Key beep set opens a dialog boxthat allows you toturn on/off the built-in speaker for key
pressing.
To set the key beep:
1. Use the UP/DOWN key to highlight Key beep set from Setup menu and press the ENTER key.
Figure 7-14 Sample Setup Screen

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Figure 7-15 Sample Beep Set Selection Screen
7.5 Diag Beep Set
Key beep set opens a dialog boxthat allows you toturn on/off the built-in speaker when
performing diagnostics.
To set the diag beep:
1. Use the UP/DOWN key to highlight Key Beep Set from Setup menu and press the ENTER key.
Figure 7-16 Sample Setup Screen
2. Press the UP/DOWN key to select an item and press the ENTER key to save and return.
Figure 7-17 Sample Diag Beep Selection Screen
2. Press the UP/DOWN arrow key select an item and press the ENTER key to save and return.
●Keypad Test
●LED Test
7.6.1 Display Test
Selecting Display Test option opens a screen that allows you to check the functionality of the
display.
To test the display:
1. Use the UP/DOWN key to highlight Display Test from Setup menu and press the ENTER key
to start test.
Figure 7-18 Sample Tool Self-test Screen
2. Check if there are any missing spots in the LCD screen.
Figure 7-19 Sample LCD Test Screen
3. To quit the test, press the BACK key.
7.6.2 Keypad Test
Selecting Key Test option opens a screen that allows you to check the functionality of the keypad.
To test the keypad:
1. Use the UP/DOWN key to highlight Keyboard Testfrom Setup menu and press the ENTER
key.
7.6 Tool Self-test
Key beep set opens a dialog boxthat allows you to check if the LCD display and the operation of
keypad and LED are working correctly. Typical menu includes:
●Display Test