dieslg8

Clear DTCs and hijack gauges with Arduino+CAN

Disclaimer

• Not for use on any public highway or wherever doing so may be against any relevant laws.
• Always wear your seatbelt.
• If it breaks/hurts/kills you/your car/your something else/etc... not my fault.
  • Harsh disclaimer but it is what it is.
  • See MIT license.
• I make no assertations that I am a professional. I'm just doing this for fun and to learn Arduino.
• It's probably best to use this project as a reference versus fork it. I have no idea what direction it will go in.

Hardware

• Arduino Uno
• Seeed Studio CANBUS v2 shield
• DB9 -> OBD2 port adapter

Vehicle

• BMW 2011 E90 335d (type code PN73)
• M57 3L turbodiesel
• Bosch EDC17 DDE

Functions

• NODE: ACC LED hijack is not working, I need to find the relevant bits and I don't have a test mule anymore
• Flash turn signal LEDs in cluster when coolant temp target is reached (a la N54 JB4)
• Gauge sweep on startup
  • Sweeps all 4 gauges, not just speedo and tach
• Log data to CSV on MicroSD card
• Consumption/oil gauge hijack
  • Shows coolant temp on consumption/oil gauge
  • Really not useful on oil-temp-gauge equipped cars
  • Reference table below
• Fuel gauge hijack
  • When throttle is above 49%, the fuel gauge becomes a boost gauge
  • Reference table below
• Clear selective DTCs on KL30 (if enabled, by default it is not)
  • Once the parts are replaced on my test mule, I'll be removing the glow plug and MAF related codes (see table below)
• Clear all DTCs on KL30 (if enabled, by default it is not)

DTCs cleared

Fuel gauge hijack

Consumption/oil gauge hijack

Reference material(s)

• BMW Tool32
  • D73N57C0.prg
  • KOMB87.prg
• My other work

Greetz

• @uholeschak