Teensy 4.0 OBDII CAN-Bus ECU Simulator Includes Teensy 4.0

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Hardware Features

The Five OBD-II Protocols

The CAN Bus today serves as the basis for OBD2 communication in the vast majority of cars through ISO 15765.

Note: The Teensy 4.0 OBDII CAN-Bus ECU Simulator supports only ISO 15765 (CAN Bus).

However, older cars (pre-2008) may use one the other four protocols that have been used as basis for OBD2. 

• ISO 15765 (CAN bus): Mandatory in US cars since 2008 and is today used in the vast majority of cars
• ISO14230-4 (KWP2000): The Keyword Protocol 2000 was a common protocol for 2003+ cars in e.g. Asia
• ISO9141-2: Used in EU, Chrysler & Asian cars in 2000-04
• SAE J1850 (VPW): Used mostly in older GM cars
• SAE J1850 (PWM): Used mostly in older Ford cars

OBD-I & OBD-II: A Complete Guide to Diagnosis, Repair, & Emissions Compliance

Onboard diagnostics (OBD) systems have been an integral part of vehicle design for decades, as OBD-II became mandatory in 1996 for all cars manufactured in the United States. Almost every aspect of the diagnostics system evolved from emissions requirements in the automotive industry. Manufacturers reacted with growing complexity in the electronic controls and reporting of errors. Fortunately, some commoditization followed in the industry, which made the job of a repair technician or do-it-yourself enthusiast slightly easier when working on these demanding systems.

Passing emissions testing has become critically important to high-performance parts and installation shop manufacturers. The US Environmental Protection Agency (EPA) and California Air Resources Board (CARB) have assessed enormous fines for violations of the Clean Air Act based on information available from the vehicle's OBD system. Many states now require vehicles to pass an OBD check to renew the registration, making proper operation even more important to consumers. OBD-I & OBD-II: A Complete Guide to Diagnosis, Repair, & Emissions Compliance is an insider's guide to modern original equipment manufacturer (OEM) diagnostics systems. More Information...