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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

Group DTC Description
EGR 40D4 EGR actuator position control
EGR 485C EGR cooler bypass valve control
EGR 4B39 EGR actuator control
EGR 4B73 EGR engine exhaust heating control
EGR 4CAE EGR position sensor plausibility
MAF 3FF1 Mass air flow sensor
MAF 4596 Smooth running controller cylinder 3
Glow plugs 4A1E Glow plug activation, cylinder 6
Glow plugs 4A24 Glow plug activation, cylinder 5
Glow plugs 4A2E Glow plug activation, cylinder 5

Fuel gauge hijack

Boost PSI Gauge %
0 psi 0%
10 psi 25%
20 psi 50%
30 psi 75%
40 psi 100%

Consumption/oil gauge hijack

Coolant temp C Gauge %
0 C 0%
37.5 C 25%
75 C 50%
112.5 C 75%
150 C 100%

Reference material(s)

Greetz