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)

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

Greetz

• @uholeschak