Laser 5091 Code Reader User’s Guide Laser 5091 Code Reader User’s Guide
indicates a situation which, if not avoided, may
result in damage to the test equipment or vehicle.
Example:
Do not soak keypad as water might fi nd its way
into the code reader.
provides helpful information such as additional
explanations, tips, and comments.
Example:
Not all data are supported by all vehicles.
Screens
Some help messages, information, and data displayed on the code reader are
also shown in graphical text boxes. The screens presented are examples only
and actual test screens may vary for each vehicle being tested.
Example:
Arrow Icon
An arrow icon indicates a procedure.
Example:
To change menu language:
1. Use the UP/DOWN key to select Language from System Setup screen.
2. Press the ENTER key to confi rm.
The code reader is specially designed to support all 9 OBDII service modes,
including live data, O2 sensor test and more, on OBDII/EOBD compliant cars,
SUVs, light-duty truck and mini-vans sold worldwide since 1996.
What is OBD?
The fi rst generation of On-Board Diagnostics or OBD I was introduced in early
1980’s to control engine functions and diagnose engine problems by vehicle
manufacturers. As the OBDI lacked standardization of protocols and interface, it
allowed different interpretations among vehicle manufacturers.
OBDII, the second generation On-Board Diagnostics, improved in both
capability and standardization, is a system developed in mid 1990’s by the
Society Automotive Engineers (SAE) to standardize automotive electronic
diagnosis. EOBD is European version of OBDII required in Europe since 2001.
The OBDII standard specifi es:
• A generic diagnostic port (Data Link Connector) and its pinout;
• The protocols and the messaging format;
• A standard list of vehicle parameters identifi cations;
• A standard list of diagnostic trouble codes (DTCs);
4. Introduction
4.1 About OBDII/EOBD
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IMPORTANT
IMPORTANT
IMPORTANT
NOTE
NOTE
NOTE
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