All cars and light trucks built for sale in the Usa just after 1996 are required to become OBD-II compliant. The European Union adopted (directive 98/69/EC) a similar law in 2001 for gasoline powered autos, and in 2003 for cars with diesel engines.
OBD II mandates a common scan tool (SAE J 1978) having a single typical plug for all automobiles manufactured in U.S.A.
The Universal interface (SAE J 2201) needs for Scan tool (SAE J 1978), Data Communication Network Interface (SAE J 1850), (SAE J 1850), Interface connector (SAE J 1962) requirements, Test Modes (SAE J 1979), and Diagnostic Trouble codes (SAE J 2012) Auto tools, and Enhanced test modes (SAE J 2190), are described in detail inside the standard. Common characteristics, electrical and mechanical characteristics are also described in the HS-3000 common. EPA regulation is the fact that (SAE J 1978) ought to have the capability to carry out bi-directional diagnostic control. Car companies will use producer particular messages to execute these functions, and later use SAE J 2205, (Expanded Scan Tool protocol) to allow these functions with SAE J 1978 automotive Scan tool.
SAE J2012 (Diagnostic Difficulty Codes1) defines a set of diagnostic trouble codes (DTCs) exactly where business uniformity has been accomplished.
The medium of communication may be the serial information link described in SAE J 1850.
OBD II mandates that all difficulty codes are logged once they are set and are retrieved by auto diagnostic scanner when commanded. And also the diagnostic information ought to be made out there when requested by auto diagnostic scan tool. So the auto diagnostic scan Tool is always to gather diagnostic messages from the automobile. Which consists:
Analog inputs and outputs Digital inputs and outputs System status information Calculated valuesImportant Note:
Only a single Code should be stored in OBD II for every single fault detected.
DTCs consist of an alpha character followed by 4 characters.
Pxxxx is reserved for powertrain DTCsBxxxx is reserved for body DTCsCxxxx is reserved for chassis DTCsUxxxx is reserved for network DTCs (UART the body electronics like door and roof manage Auto code scanner, air conditioning, and lightning, too as for the entertainment manage).The second character designates whether or not the DTCs and also a generic SAE DTC or even a manufacturer precise DTC.
Powertrain codes
P0xxx - Generic P1xxx - Manufacturer-specific P2xxx - Generic P30xx-P33xx - Manufacturer-specific P34xx-P39xx – GenericBody codes
B0xxx - GenericB1xxx - Manufacturer-specificB2xxx - Manufacturer-specificB3xxx - GenericChassis codes
C0xxx - Generic C1xxx - Manufacturer-specific C2xxx - Manufacturer-specific C3xxx - GenericNetwork Communication codes
U0xxx – GenericU1xxx - Manufacturer-specificU2xxx - Manufacturer-specificU3xxx – GenericThe remaining characters designate the method related to the fault. The characters are hex and can range from 0 – F.
The third digit defines the precise system or sub-system inside the vehicle exactly where the issue is situated:
- Fuel and Air MeteringFuel and Air Metering (injector circuit malfunction only)Ignition System or MisfireAuxiliary Emission Manage SystemVehicle Speed Manage and Idle Control SystemComputer Output CircuitsTransmissionsTransmissionsControl Modules, input and output signals
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