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The ELM322 allows you to turn your computer into an Auto Diagnostic System. Free and paid software is available. New unlock product in stock

Weight:0.80 lbs
Price: US$42.00
Shipping: Add to cart to determine shipping fee


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How to determine vehicle's OBD2 protocol.

To determine what protocol your vehicle uses, check for a label under the hood or check your vehicle's diagnostic connector.

  • J1850 PWM - The connector must have pins 2, 4, 5, 10, and 16. May or may not have additional pins.
  • J1850 VPW - The connector must have pins 2, 4, 5, and 16, but not 10. May or may not have additional pins.
  • ISO 9141-2 & KPW - The connector must have pins 4, 5, 7, and 16. Pin 15 may or may not be present.
  • CAN-BUS (J1939 & ISO15765-4) - This type of connector must have pins 6 and 14.

What is CAN-BUS?

Controller–area network (CAN or CAN-bus) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer.

A modern automobile may have as many as 50 (the Mercedes S-class has about 60 onboard computers) electronic control units (ECU) for various subsystems[citation needed]. Typically the biggest processor is the engine control unit, which is also referred to as "ECU" in the context of automobiles; others are used for transmission, airbags, antilock braking, cruise control, audio systems, windows, doors, mirror adjustment, etc. Some of these form independent subsystems, but communications among others are essential. A subsystem may need to control actuators or receive feedback from sensors. The CAN standard was devised to fill this need.

CAN is used in the OBD-II vehicle diagnostics standard, mandatory for all cars and light trucks sold in the United States since 1996, and the EOBD standard, mandatory for all petrol vehicles sold in the European Union since 2001 and all diesel vehicles since 2004.
Pinouts for common CAN-bus connectors

Helpful links

Helpful links

Interface type Common compatible vehicles Compatible protocols
ELM320 Serial Ford, Mazda, Mercury J1850 PWM
ELM322 Serial GM, Buick, Cadillac, Chevy, Dodge, GMC, Isuzu, Jeep, Oldsmobile, Pontiac, Saturn, Toyota J1850 VPW
ELM323 Serial
Audi, BMW, Chrysler, Citroen, Dodge, Fiat, Geo, Honda, Hyundai, Jeep, Kia, Land Rover, Mazda, Mercedes, Benz, Mini, Mitsubishi, Nissan, Opel, Peugeot, Renault, Saab, Subaru, Suzuki, Toyota, VW, Volvo ISO9141
KWP 2000
ELM327 Serial
ELM327 Bluetooth
All above vehicles plus CAN-bus enabled vehicles 1850PWM
KWP 2000


The ELM322 OBDII Interface, allows you to talk to your VPW (10.4KHz J-1850 VPW) standard OBDII equipped vehicle using an RS232 serial connection. It is typically used in US cars from General Motors and some from Daimler Chrysler. It transparently converts between a VPW J-1850 data stream and standard ASCII characters, allowing trouble codes and operating parameters to be easily retrieved without the need for special software. No knowledge of data formatting, error checking, bus initiation etc. is needed either, as the ELM322 handles all of it for you. The present version of the ELM322 (v2.0) provides several programmable features that the previous versions did not offer.


  • Read Codes: Display all Trouble Codes and Descriptions. Poll some codes more frequently than others. View minimum, maximum, & current values
  • Export Data for spreadsheet & printing
  • Clear Codes: Arrange, add, delete codes to your specifications
  • Monitor real time data in Metric & U.S. Standard
  • Record & Graph data
  • Performance Timer: 0 to 100 km/h
  • Many advanced features


  • Some compatible vehicles include: Ford, Chevrolet, Chrysler, Acura, BMW, Buick, Cadillac, Daewoo, Dodge, Fiat, GMC, Honda, Hyundai, Infinity, Isuzu, Jaguar, Jeep, Kia, Land Rover, Lexus, Mazda, Mercedes-Benz, Mercury, Mini, Mitsubishi, Nissan, Oldsmobile, Peugeot, Pontiac, Porsche, Renault, Saab, Saturn, Seat, Skoda, Smart, Suzuki, Toyota, Volkswagen, Audi, Volvo, and many others.
  • Supported OBDII protocols: ISO9141, ISO14230 (KWP 2000)
  • Compatible software (free):


  • Working for VPW protocol over ELM322 Interpreter MCU
  • Cable is based on certified RS232 level shifters
  • Elm Chip installed
  • Connects to your computer's serial
  • Compatible with ISO9141, ISO14230 (KWP 2000) Protocols
  • LED Status lights
  • Powered from vehicle's OBD2 connector

Package content

  • ELM322 RS232 interface
  • Software is not included with this item
  • 1 month warranty


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