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Most cars and trucks on the road today have an OBD2-compliant computer system. These On-Board Diagnostic Version 2 systems manage engine functions and diagnose problems. Along with the onboard computers, the OBDII standard provides universal troubleshooting equipment and procedures that help the do-it-yourself enthusiast and the professional mechanic quickly fix vehicle problems and get back on the road as soon as possible.
Contents
- 9 OBD2 Applications
What Is OBD2?
Electronic diagnostic tools are nothing new. Our vehicleshad them since Volkswagen introduced the first self-diagnostic system back in1969. These systems improved vehicle maintained overnight by giving techniciansthe information they need to know what is happening inside the engine withouttaking it apart. However, these early systems were proprietary and veryspecific to their manufacturers.
In 1991, California established the first OBD standard toreduce exhaust emissions. The Environmental Protection Agency (EPA) expandedand brought it nationwide five years later as the OBD2 standard we have today.Because of this, every vehicle made after 1996 is guaranteed to be OBD-IIcompliant.
What Does OBD2 Do?
OBD2 provides a complete framework for control the entireengine electronically. It also provides a universal way to monitor and diagnoseproblems with the vehicle’s chassis, body, and accessory devices.
The OBD2 computer also controls the “Check Engine Light”, or Malfunction Indicator Light (MIL) as it is known in the industry. Because of this, the MIL is how most people interact with the system.
Finally, the OBDII computer saves a snapshot, called a freeze-frame, of the engine’s operating environment. A freeze-frame is all you need to diagnose and troubleshoot your vehicle.
You can even use OBD2 to customize the vehicle’s speed andperformance through power loaders
Why Do We Need OBD-II Technology?
The OBD2 standard comes from a half-century attempt to dealwith smog and other health problems in cities around the country. Before thestandard, each manufacturer developed their own proprietary ways to do this.There was no real standard at the time, and getting compatible equipment for avehicle was a lesson in frustration.
Now, you can diagnose and troubleshoot emission problems onany vehicle without worrying if you have the correct parts. OBD2 even goesbeyond emissions to help you find and repair any problem under the hood from asingle point of contact.
The OBD2 Diagnostic Connector
During their first attempt to establish a universalemissions system standard, the EPA asked the Society of Automobile Engineers todevice a universal port. Their solution became the SAE J196 interface port weuse today. This port, called the OBD2 Diagnostic Connector, is your maininterface to your vehicle’s OBD-II system.
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The Connector is a 16-pin, electronic interface thatfeatures two rows of eight female pins and a groove between them. The D-shapedport comes in two variations. Type A has the groove running its entire lengthand can handle 12-volt systems. Type B can easily do 24 vols with its spitgrove.
Despite having room for 16 pins, your connector may onlyhave a few of them available. These differences come from the OBDIItransmission protocol it uses.
OBD2 Protocols
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These OBD2 protocols came from a need to get information out of complaint systems while giving manufacturers time to something more universal. Because of this, the EPA and industry leaders created five different OBD2 protocols by the manufacturer.
SAE J1850 Variable Pulse Width
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General Motors used variable pulse widthmodulation to transmit the data along Pin 2 as a 10.4-kps sequence ofalternating high and low voltages.
SAE J1850 Pulse Width Modulation (KWP)
Ford preferred pulse width modulation (PWM). PWN is a morerobust transmissions system, but it uses pulse length to define its bits.Because of this, it required a separate clock signal on Pin 10 along with thedata on Pin 2. At least, it gave Ford a 41.6 kbps signal.
ISO 9141-2
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Chrysler, as well as European and Asian manufacturers, hadtheir own standard. This asynchronous serial connection worked like oldcomputer serial ports. It transmits data as a single bit, but it allowed anupload and a download signal. OBD2 assigns these signals to pins 7 (K) and 15(L) with a 10.4 kbps transfer rate. It was replaced with KWP2000 in 2004.
ISO 14230 Keyword Protocol (KWP) 2000
As the enhanced version of ISO 9141-2, KWP served asChrysler’s bridge between the older format and CAN. It used the sameasynchronous serial signal with similar bandwidth ratings. It did have a slow(5 baud) and fast variants based on how the initiate transfers.
ISO 15765-4/SAE J2480 Controller Area Network (CAN)
CAN is the true universal OBD2 protocol,used on every vehicle since 2008. Similar to the USB computer standard, CAMprovides an industry-wide, message-based protocol that can run host free. Ituses pins 6 and 14 as a two-wire, differential serial format that can clocktransmission speed up to 1 Mbps. It can even handle communication betweenseveral subsystems at the same time, allowing carmakers to add additionalfunctionality to the whole system.
Some manufacturers may include subsystems that are not OBD2-compliant, but you can rest assured that your 2008 or newer vehicle is at least CAN-certified.
Bonus: Which OBD2 Protocol is Supported by My Vehicle?
ODB2 Codes and OBD2 PIDs
To help facilitate communication, the OBD2 standard definesa list of standard diagnostic trouble codes (DTC). The DTC lets you quicklyassess the health of an engine. You need a compliant scanner to get them, butthey are easy to understand.
Most scan tools will attempt to interpret the code for you,but this handy chart will give you an insight into the most common OBD-IIcodes.
OBD2 Parameter IDs
Along with the DTC, the OBD2 standard defines parameter IDs(PIDS). While the DTC transmit information out of the system, PIDs sendsrequests to it. Effectively they are the command codes for the system.
There are too many to list, but you can read more about themhere.
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10 OBD2 Service Modes
You will find both EPA-defined and manufacturer-specificPIDS, split into the following categories or service modes.
OBD2 Applications
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Originally, you need a dedicated OBDII scan tool to read theDTC, send PIDs, and interact with the subsystem. Today, you can use anyelectronic device to actually read the codes. That includes traditionalscanners, a desktop or laptop computer, or your mobile device.
OBD2 Cable Scan Tools
Traditional cable scan tools are portable, hand-held devicesyou connect directly to the Diagnostic Connector. You will find a large varietyof OBD2 scan tools on the market. Each has its own purpose, and therefore willonly show a subset of all the features available to you.
Therefore, you generally want a scan tool that can readseveral protocols to give you as much information about your vehicle as you canafford. That way, you can use the same tool regardless if you decide to keep ortrade your car in for another.
Either way, cable scan tools just provide a singlemenu-based display to read codes and descriptions. Some tools will even providesome vehicle-specific info as well.
Bluetooth OBD2 Scanners
Besides the wired scanners, you will see several wirelessoptions. These OBD2 tools use Bluetooth adapters to retrieve data. These scantools may even provide mobile-like reading and programming apps. Some may letyou transmit the data to your phone or mobile device.
Many Bluetooth ODB-II apps with extra features you willnever find on a traditional tool, including extensive logging solutions.
PC-based OBD2 Software
PCs offer several advantages over the dedicated handheldscan tools. OBD2 PC software offers larger displays. They provide immediateaccess to internet search tools.
You also have access to numerous full-featured, free andpaid OBD2 diagnostic software. Many even let you customize the interface tosuit your needs. Some ODB2 PC software can even offer video tutorials that canhelp you troubleshoot even the worse problems for no extra cost.
You also need PC-based OBD2 software to use data loggers.
Data Loggers
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Perfect for prototypes and extensive testing, OBD2 dataloggers provide time-stamped archives of your vehicle’s freeze frames. You mustpreprogram them to work, but they offer a simple solution if you want to recordthe data and not process it right away.
Emission testing
As the OBD2 standard exists to reduce emissions, it makessense that there are dedicat4ed emissions testing modes for it. These tests arealso much easier and quicker than the traditional tailpipe testing procedures,reducing the testing time down to seconds.
OBDII sensors can even find emissions problems that wouldotherwise go unnoticed with a tailpipe test.
Driver’s supplementary vehicle instrumentation
Some manufacturers provide additional vehicle informationdirectly on the dashboard as an incentive to buy their vehicles. Thesedashboard apps are OBD2 scan tools build straight into the car you can useduring normal operations.
You can even install these tools as aftermarket additions tothe vehicle such as manifold vacuum, battery current, and other diagnosticmonitors.
Does My Car Have OBD2?
If your vehicle comes from 1996 or newer, it has OBD2.Beyond that, you may find the system in cars as far back as 1994.
Most of the time, the only thing you must worry about is thetransmission protocol. Before 2008, Manufacturers had their own profferedmethods. So, you must check which protocol you have if you have a 2007 or oldervehicle.
Fortunately, you just need to check the pins in theconnector to answer the question. Each protocol has its own pin requirements,making it an easy check.
If your vehicle is 2008 or newer, your vehicle is guaranteed to be OBD2 CAMcompliant.
The Bottom Line
Since 1996, the OBD2 standard streamlined how we diagnose and troubleshoot problems with our vehicles. It defines a whole ecosystem of devices and subsystems that interact with each other so we can get more out of our rides. If you need more information on how it works with your vehicle, you can contact our representatives, and we will walk you through it so you can get the right tool for the job.
Read more: OBD1 vs OBD2: Definite Interpretation and Comparison