Which OBD2 Protocol is Supported by Your Vehicle?

On-board diagnostics (OBD) tends to be an automotive term discussing a vehicle’s self-diagnostic and confirming capability. OBD systems supply the vehicle owner or even repair technician entrance to the status of the many vehicle subsystems.

Generally OBB-2 is very much perfect for each and every car. The OBD-2 code readers are an on-board diagnostic device utilized to detect automobile faults.

Does Your Vehicle Contain ODB-II?

Definitely, Right after January 1, 1996 all vehicles and light trucks built and sold in America, were necessary to be OBD II outfitted. Generally, this implies most 1996 model season cars and light trucks are up to date, if built-in late 1995 even.

Two factors will demonstrate in case your vehicle is certainly OBD (ON-BOARD DIAGNOSTIC) II equipped:

  1. There will be a good OBD (ON-BOARD DIAGNOSTIC) II connector seeing that shown below.
  2. There will be a short note on a sticker or even nameplate beneath the hood: “OBD II compliant”.

Where is the connector located?

The OBD-2 standard supplies an extensible set of DTCs. As a complete consequence of this standardization, a single gadget may query the on-board computer (s) in an automobile. This OBD-2 came in 2 models. They’re OBD-2A and OBD-2B.

Location of ODB-2A:

In accordance with J1962, Type A DLC will be situated in the particular passenger or driver’s compartment in your community bounded by the driver’s end of the device section to 300 millimeter (~1 feet) further than the automobile centerline, mounted on the device section and accessible in the driver’s seat. The most well-liked location is between your steering column and the automobile centerline.

Type A – J1962 Vehicle Connector

Type A – J1962 Vehicle Connector

Location of ODB-2B:

Type B DLC will be situated in the passenger or even driver’s compartment in your community bounded by the driver’s end of the device panel, like the external side and a good imagined line 750 mm (~2.5 feet) beyond the automobile centerline.

It will be attached to the device panel and accessible from the driver’s chair or from the Co-drivers chair or through the exterior. The automobile connector will undoubtedly be mounted to facilitate mating plus unmating.

Type B – J1962 Vehicle Connector

Type B – J1962 Vehicle Connector

OBD-2 Protocols:

You can find five signaling protocols which are permitted with the OBD-2 interface. Most automobiles implement just 1 of the protocols. It is probable to consider the process utilized predicated on which hooks can be found on the J1962 connector:

  1. SAE J1850 VPW: Mainly used by Ford.
  2. SAE J1850 PWM: Mainly used by Common Motors.
  3. ISO 9141-2: This process comes with an asynchronous serial information price associated with 10.4 Kbit/s. It really is similar to RS-232; however, the particular signal amounts will vary, and communications occurs about the same, bidirectional series without extra handshake signals. ISO 9141-2 can be used in Chrysler primarily, Euro, and Asian automobiles.
  4. ISO 14230 KWP2000: Applied to some Asian vehicles.
  5. ISO15765-4/SAE J2480 (a ” taste ” of CAN): The particular CAN protocol originated by Bosch intended for motor vehicle and commercial control. Unlike various other OBD protocols, variants are employed outside the automotive industry widely. While it didn’t satisfy the OBD-2 requirements intended for U. S. vehicles before 2003, as of 2008 most automobiles sold in America are needed to implement CAN as one of the signaling protocols.

Which OBD-2 Protocol is supported by your Vehicle?

As a general rule, you can determine which protocol your vehicle is using by looking at the pinout of the DLC:

Which protocol your vehicle is using?

Which protocol your vehicle is using?

The following table explains how to determine the protocol:

[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 (also called the “L-line”) is optional in newer vehicles that use the ISO9141-2 or ISO14230-4 protocols.

In addition to pins 2, 7, 10, and 15, the connector should have pins 4 (Chassis Ground), 5 (Signal Ground), and 16 (Battery Positive).

The Connector:

  • Pin 2 – J1850 Bus+
  • Pin 4 – Framework/Chassis Ground
  • Pin 5 – Signal ground
  • Pin 6 – CAN High (J-2284)
  • Pin 7 – ISO 9141-2 K Line
  • Pin 10 – J1850 Bus
  • Pin 14 – CAN Lower (J-2284)
  • Pin 15 – ISO 9141-2 L Line
  • Pin 16 – Power of Battery

On 1996 plus vehicles later, it is possible to tell which protocol can be used by examining the particular OBD II connection:

  1. J1850 VPW: The connector must have material contacts inside pins 2, 4, 5, and 16, but not 10.
  2. ISO 9141-2/KWP2000: The connector must have metallic contacts inside pins 4, 5, 7, 15,      plus 16.
  3. J1850 PWM: The connector must have metallic contacts inside pins 2, 4, 5, 10, plus 16.
  4. CAN: The connector must have material contacts inside pins 4, 5, 6, 14 and 16.

If your automobile offers this design connection, but does not have these types of pins populated, you’ve got a pre-OBD-II vehicle probably. To include some confusion, even getting the connection with the contacts shown above is not a warranty of OBD- II compliance.

This design connector has been seen on some pre-1996 vehicles that have been not really OBD- II complaint. So the above description about OBD-II will be suitable for you to select the best OBD-2 Protocol for your vehicles.

According to the rule of thumb;

  • GM vehicles plus light trucks make use of SAE J1850 VPW (Variable Pulse Breadth Modulation).
  • Chrysler items and all European & most Asian imports utilize ISO 9141 or even KWP2000 circuitry.
  • Fords utilize SAE J1850 PWM (Pulse Breadth Modulation) communication patterns.
  • CAN is used by all 2008 plus newer model year vehicles.

There are several variations amongst captive imports like the Cadillac Catera, a German Opel derivative, which uses the particular European ISO 9141 protocol. When you have initial hands understanding of other these variants, please deliver them in plus, together, we are able to create a more complete list.

Rick Man Joorian

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