U Scanner Manual - Beat The Garage

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1. Safety Precautions and WarningsTo prevent personal injury or damage to vehicles and/or the scan tool, read thisinstruction manual first and observe the following safety precautions wheneverworking on a vehicle:• Always perform automotive testing in a safe environment.• Wear safety eye protection that meets the required standards.• Keep clothing, hair, hands, tools, test equipment etc away from allmoving or hot engine parts.• Operate the vehicle in a well ventilated work area. Exhaust gasesare poisonous.• Put blocks in front of the drive wheels and never leave the vehicleunattended while running tests.• Use extreme caution when working around the ignition coil, distributorcap ignition wires and spark plugs. These components createhazardous voltages when the engine is running.• Put the transmission in PARK (for automatic transmission) or NEUTRAL(for manual transmission) and make sure the parking brake is engaged.• Keep a fire extinguisher suitable for gasoline/chemical/electrical firesnearby.• Don’t connect or disconnect any test equipment while the ignition is onor the engine is running.• Don’t connect or disconnect any test equipment while the ignition is onor the engine is running.• Keep the scan tool dry, clean, free from oil/water or grease. Use a milddetergent on a clean cloth to clean the outside of the scan tool whennecessary.2. General InformationThe first generation of On-Board Diagnostics called OBDI were developed bythe California Air Resources Board (ARB) and implemented in 1988 to monitorsome of the emission control components on vehicles. As technology evolvedand the desire to improve the On-Board Diagnostic system increased, a newgeneration of On-Board Diagnostic System was developed. This secondgeneration of On-Board Diagnostic regulations is called OBDII.The OBDII system is designed to monitor emission control systems and keyengine components and vehicle conditions. When a problem is detected, theOBDII system turns on a warning lamp (MIL) on the vehicle instrument panel toalert the driver typically by the phrase of “Check Engine” or “Service EngineSoon”. The system will also store important information about the detected
malfunction so that a technician can accurately find and fix the problem. Threesuch examples of this are:• Whether the Malfunction Indicator Light (MIL) is commanded “on” or“off”.• Which, if any, Diagnostics Trouble Codes (DTC’s) are stored.• Readiness Monitor Status.Diagnostic Trouble Codes (DTC’s)OBDII Diagnostic Trouble Codes are codes that are stored by the On-BoardComputer Diagnostic System in response to a problem found in the vehicle.These codes identify a particular problem area and are intended to provide youwith a guide as to where a fault might be occurring within a vehicle.OBDII Diagnostic Trouble Codes consist of a five digit alphanumeric code. Thefirst character, a letter, identifies which control system sets the code. Theother four characters, all numbers, provide additional information on where theDTC originated and the operating conditions that caused it to set.Location of the Data Link Connector (DLC)The DLC (Data Link Connector or Diagnostic Link Connector) is thestandardized 16-cavity connector where diagnostic scan tools interface withthe vehicle’s On-Board Computer. The DLC is usually located 12 inches fromthe centre of the instrument panel (dash), under or around the driver’s side formost vehicles. If the DLC is not located under the dashboard, there should bea label telling the location. For some Asian and European vehicles, the DLC islocated behind the ashtray and this must be removed to access the connector.If the DLC cannot be found, refer to the vehicle’s service manual for thelocation.OBDII Readiness MonitorsAn important part of a vehicle’s OBDII system is the Readiness Monitors, whichare indicators used to find out if all the emission components have beenevaluated by the OBDII system. They are running periodic tests on specificsystems and components to ensure that they are performing within allowablelimits.Continuous MonitorsSome of the vehicle components or systems are continuously tested by thevehicle’s OBDII system, while others are tested only under specific vehicle
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U Scanner Manual - Beat The Garage

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