Which OBD2 protocol is supported by your vehicle?




There’s a tendency of Onboard Diagnostics (OBD) to stand as an automotive expression when having discussions about the capability of the confirming and self-diagnostics of a vehicle. Vehicle owners, alongside repair technicians are provided with the leeway of observing the condition of the subsystems of many vehicles.


Usually, almost all cars can operate perfectly with the OBD 2. The onboard diagnostic unit that is used to recognize errors in an automobile is referred to as the OBD 2 code reader.


Does Your Vehicle Contain ODB-II? 


Immediately following January 1, 1996, OBD was required to be integrated in all American-made and light trucks and vehicles which were up for sale. This means that the majority of light trucks and cars that are models of 1996 are currently updated. This is the same for those manufacture in the last part of 1995.


Given that an OBD is undoubtedly integrated into your vehicle, there are 2 things that will portray this:


1. A nameplate underneath the hood or a sticker will have the words “OBD II complaint” printed on them.


2. A proficient OBD II connector will exist.


Where is the connector located? 


An expandable collection of DTCs is provided by the OBD-2 benchmark. Subsequent to this standardization, the automobile’s integrated computer be may queried by an individual gadget. There were 2 models that this OBD-2 was featured in; the OBD-2B and OBD-2A.


Location of ODB-2A: 


Type A DLC in the same degree with J1962 will be located in a specific driver community or passenger’s partition in your area, encircled by the driver’s section of the tool section up to approximately 1 foot (300 millimeters) further than the centerline of the automobile. It is straddled onto the device segment, which can be accessed by sitting in the seat of the driver. The most favorable place is in the middle of the automobile’s centerline and the steering column.


Location of ODB-2B: 


You can find the Type B DLC in the driver’s partition in the community enclosed by the driver’s section of the tool panel similar to the outside section and a suitable 750-mm imagined line exceeding the centerline of the automobile. There’ll be an attachment to the console of the device and can be accessed from the chair where the driver sits or via the exterior. Certainly, mating and unmating will be facilitated by way of mounting the automobile connector.


OBD-2 Protocols: 


The interface of the OBD-2 consists of 5 signaling protocols that are allowed to be used with it. Majority of the automobile units administer just a single protocol of the few. It’s most likely to deem the predicated utilized process, where you can find hooks on the connector of the J1962:


1. SAE J1850 PWN: Principal tool of Common Motors.
2. SAE J1850 VPW: Predominantly employed by Ford.


3. ISO 9141-2: There’s a non-parallel serial information which accompanies this process and is linked with 10.4 Kilobits per second. There’s great similarity to the RS-232. Nevertheless, there’ll be variations in the distinct signal quantity.


Besides, communication takes place simultaneously, two-way directional series which lack additional handshake signals. Chrysler is the primary brand where the ISO 9141-2 is able to be employed but it can be utilized in Asian and Euro automobiles also.


4. ISO 14230 KWP2000: Integrated into several Asian vehicles.


5. ISO15765-4/SAE J2480 (a “taste” of CAN): Bosch create the specific CAN protocol which is aimed at commercial and motor vehicle control. Dissimilar to several alternate OBD protocols, other protocols are widely utilized at the external of the automotive line of work. Before 2003, the U.S. vehicles’ OBD 2 prerequisites were not fully met but as soon as 2008 came, CAN is needed to be implemented in the majority of the sold automobiles in America to act as a single signaling


Which OBD-2 Protocol is supported by your Vehicle? 


Generally, the DLC’s pinout can be used to find out the protocol that is being used by your motor vehicle simply by observing it:


You can see how the protocol is determined from the table below:


[gttable type=”table-striped table-hover” cols=”Pin 2,Pin 6,Pin 7,Pin 10,Pin 10,Pin 14,Pin 15′′]must have|-|-|must have|-|-|J1850 PWM|must have|-|-|-|-|-|J1850 VPW|-|-|must have|-|-|may have|ISO9141/14230|-|must have|-|-|must have|-|ISO15765 (CAN)[/gttable]


Pin 15 (the “L-line”) is non-compulsory in more recent vehicles that utilize the ISO14230-4 or ISO9141-2 protocols.


As an extension to pins 15, 10, 7 and 2, Chassis Ground (pin 4), Signal Ground (pin 5) and Battery Positive (pin 16) should be included with the connector.


The Connector: 

  Pin 16 – Battery’s Power Source

  Pin 15 – ISO 9141-2 L Line

  Pin 14 – CAN Lower (J-2284)

  Pin 10 – J1850 Bus

  Pin 6 – CAN High (J-2284)

  Pin 5 – Signal ground

  Pin 4 – Framework/Chassis Ground

  Pin 2 – J1850 Bus+

  Pin 7 – ISO9141-2 K Line


With vehicles that are 1996 or later, just by inspecting the specific OBD 2 connection, you can determine which protocol can be utilized:
1. J1850 VPW: Material contacts must be an inclusion of the connection within pins 4, 5, 2 and 16. However, this is not the case for pin 10.

2. within pins 6, 5, 4, 14 and 16.

3. J1850 PWM:
Metallic contacts must be an inclusion of the connection within pins 5, 4, 2, 10 and 16.
4. ISO 9141-2/KWP2000: Metallic contacts must be an inclusion of the connection within pins 4, 5, 7, 15 and 16.


You probably possess a pre-OBD II vehicle if this specific design connection is offered by your automobile, but lacks these categories of pins. In bringing about some degree of confusion, it’s not an assurance that it’s an OBD-II compliance in even obtaining the connection to the contacts. Several pre-1996 and partially non- OBD-2-compliant vehicles have been spotted with the design connector. In selecting your vehicles’ most effective OBD-2 Protocol, the OBD-2 description above will be appropriate for you.


Based on the rule of thumb: 




Material contacts must be an inclusion of the connection


CAN is employed by vehicles that are 2008 and beyond.
Ford vehicles use SAE J1850 PWM (Pulse Breadth


Modulation) communication patterns.
Chrysler items and all European & most Asian imports utilize ISO 9141 or even KWP2000 circuitry.
GM vehicles and light trucks make use of SAE J1850 VPW


(Variable Pulse Breadth Modulation).


There exist several distinctions amongst confined imports such as the Cadillac Catera, which is a derivative of the German Opel and utilizes the individual European ISO 9141 protocol. In the case that you possess a good understanding of alternate variants, together we can produce a more comprehensive list.