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ELM327 AUTO DIAGNOSTIC OBD2 INTERFACE (COM PORT) | |
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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.
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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
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Helpful links
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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 USB
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
ISO14230
KWP 2000 |
ELM327 USB
ELM327 Serial
ELM327 Bluetooth |
All above vehicles plus CAN-bus enabled vehicles |
1850PWM
J1850VPW
ISO9141
ISO14230
KWP 2000
J1939
ISO15765-4 |
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Description
The RS232 ELM327 is the newly developed scan tool. It supports all OBDII protocols. The processor is an ELM327. The output protocol (connection to laptop) is RS232 (9 pin COM Port).
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Features
- Data graphing and logging
- Freeze Frame data
- Continuous and Non-Continuous Oxygen Sensor test results
- Works with all OBDII compliant vehicles
- Compatible with J1850PWM, J1850VPW, ISO9141, ISO14230 (KWP2000), Plus CAN-BUS (J1939, ISO15765-4)
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Compatibility
- 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.
- Compatible software (free):
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Functions
- Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database).
- Clear trouble codes and turn off the MIL ("Check Engine" light).
- Display current sensor data, including:
- Engine RPM
- Calculated Load Value
- Coolant Temperature
- Fuel System Status
- Vehicle Speed
- Short Term and Long Term Fuel Trim
- Intake Manifold Pressure
- Timing Advance
- Intake Air Temperature
- Air Flow Rate
- Absolute Throttle Position
- Oxygen sensor voltages/associated short term fuel trims
- Fuel System status
- Fuel Pressure, and many others.
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Package content
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