My suggestion is to have a fuel cutoff professionally installed. If you mess up you can be looking to purchase another ECU. Here is some more information you need to read before proceeding if this vehicle is on the road.
Arduinos are designed for experimentation and learning, often used with breadboards and loose wires, which can become unreliable if vibrated. They are not built for harsh, dirty, or electrically noisy environments commonly found in industrial, automotive, or other commercial applications, making them unsuitable for such settings.
To ensure we can provide the most accurate assistance, please include detailed information about your setup. Specify the exact board, shield, wiring configuration, and power sources you are using. An annotated schematic is ideal, as it provides a clear overview of your setup, but be sure to also include links to the technical specifications of your hardware components.
Before posting your code, please review the forum guidelines and use code tags for better readability. Also, provide links to the technical information about your hardware, and include a preliminary schematic that shows all power, ground, and connections. For additional guidance, you can refer to this link: Useful Links and Tutorials. Note that in this context, breadboard diagrams are not considered proper schematics.
Resources for Automotive Electronics:
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STMicroelectronics Application Note AN2689:
This application note provides guidelines on protecting automotive electronics from electrical hazards, focusing on design and component selection. Reading this will greatly enhance your understanding of automotive circuit protection.
Read AN2689 -
Analog Devices: Automotive Electronics Design:
This article distills key insights into designing automotive electronics, offering practical advice for engineers.
Read the article -
Diodes Incorporated: Transient Voltage Suppression in Automotive:
Learn about techniques to protect automotive circuits from transient voltage, which is critical for ensuring reliable operation in harsh conditions.
Read the article -
AEC-100 Standards Webinar:
This webinar from Monolithic Power Systems provides a detailed overview of AEC standards, essential for understanding automotive electronics requirements.
Watch the webinar -
Understanding Automotive Electronics, An Engineering Perspective by William B. Ribbens:
This comprehensive book offers an in-depth look into automotive electronics from an engineering perspective, making it an invaluable resource.
Access the book -
Check this for OBD https://vehiclefreak.com/iso9141-code-meaning-how-to-fix/ OBD negotation initialization procedure https://cdn.standards.iteh.ai/samples/16738/20ff360c25c6462b811ebc0c9256eee0/ISO-9141-2-1994.pdf Then there is https://github.com/muki01/OBD2_K-line_Reader PID codes: OBD-II PIDs - Wikipedia
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Load Dump and Cranking Protection for Automotiv Backlight LED Power Suppl https://www.ti.com/lit/an/snva681a/snva681a.pd
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Quality requirements:
http://www.aecouncil.com/AECDocuments.html
These resources should provide a strong foundation for anyone involved in automotive electronics design. If you need further help or more resources, feel free to ask!
https://forum.arduino.cc/t/struggling-with-k-line-iso-9141-2-communication/1307351/9