FZ Bike communication between the ECU and Arduino Mega.
Identify the ECU connector in Bike.
I started looking into the schematics and i saw that there where two wires on the communication BUS.
There is a diagnostic Connector near the Battery that is directly connected on the Bus.
There is a diagnostic Connector near the Battery that is directly connected on the Bus.
(Interfacing ECU part i have copied the diagram from "http://www.iwasz.pl/")
Identify by what means communication between the ECU and the dashboard is performed.
Which cables are used and what is the protocol used? After inspecting the service manual for my bike I was able to eliminate wires which are used for other things (see picture), and I left with only one, which is connecting the dash, the ECU and the immobilizer. Other ones was for flashing some warning LEDs, gathering information from fuel pump, oil switch and so on. So the yellow-blue wire was my first guess and it was correct. On the ecuhacking forum, which was source of very helpful information, guys was talking about something called K-line. I believe it is something widely common in the automotive industry, and for certain it has bunch of ISO standards describing it, but hey, if this is only one wire, and data flowing inside is some kind of serial communication.
Figure out how to interface this, make some circuit if needed.
Again on the ecuhacing forum I’ve found information that K-line has logic levels relative to 12V, where 0V is logic 0, and 12V logic 1. There has to be some voltage level converter if I want to connect some TTL stuff to it. On the forum some guys were using a L9637 chip which is described as “ISO 9141 INTERFACE” by its datasheet. So I bought a few of these and connected it as follows :
Later on I removed the 510 ohm pull up resistor, because after turning engine on there was error showing of on the dash. I guessed that could be this resistor, and it helped. Dunno what was wrong.
Most difficult part for me was to find a place in motorcycle’s wiring to connect to. After some time I managed to insert piece of rigid wire to the back side of ECU connector as depicted below:
5V supply voltage I was drawing from step down voltage converter which I bought on the Internets. It is a PCB with a few discrete parts and quite huge radiator with some coils inside. There is [EDIT] label on it. To the output of L9637 I connected a Saleae logic analyzer, which I also bought. It is quite cheap and has good software for Windows, Linux and MAC OS. I can definitely recommend it, especially if you want to use it with Linux (I use Ubuntu).
Sniff the data, and collect it for further investigation.
My circuit worked the first time. After turning ignition to the ON state this is what I got:
Sealae logic analyzer window
Accessing data with arduino Mega
#include <SoftwareSerial.h> SoftwareSerial mySerial(10, 11); // RX, TX void setup() { // initialize both serial ports: Serial.begin(115200); // set the data rate for the SoftwareSerial port mySerial.begin(16064); } void loop() { static int count = 0; // read from port 1, send to port 0: if (mySerial.available()) { int inByte = mySerial.read(); if (inByte == 0x01 && count >= 5) { Serial.println(' '); count = 0; } Serial.print(inByte, HEX); Serial.print (' '); ++count; } }
As you can see, RX is set up for pin 10, so the only thing I did was to disconnect the logic analyzer, and connect Arduino pin 10 instead. But nothing happened. This was because the SoftSerial library have a few baud rates predefined, namely the most usual ones. The solution was to modify arduino-1.0.5/libraries/SoftwareSerial/SoftwareSerial.cpp so it looks like that:
Here is the link you should follow for more info. I haven’t figured it out by myself. After this modification Arduino happily sent me my precious data, which I observed in serial monitor.
This is the data I collected so far (motorcycle standing on central stand, back wheel revolving, velocity comes from the back wheel, ABS LED blinking).
Ignition ON, engine stopped.
1 0 0 0 30 30
1 0 0 0 30 30
1 0 0 0 30 30
1 0 0 0 30 30
...
Ignition ON, engine started, no throttle (~1200 RPM), no gear (N) i.e. wheel not revolving, cold engine:
1 24 0 0 30 54
1 24 0 0 30 54
1 24 0 0 30 54
1 24 0 0 30 54
...
Ignition ON, engine started, little throttle (more RPM), no gear (N) i.e. wheel not revolving, cold engine:
1 34 0 0 53 87
1 34 0 0 53 87
1 34 0 0 53 87
1 34 0 0 53 87
...
1st gear, no throttle (engine warmed up thus less RPM). About 10 km/h
1 17 0 0 5C 73
1 17 1 0 5C 74
1 17 1 0 5C 74
1 17 0 0 5C 73
1 17 1 0 5C 74
1 18 1 0 60 79
1 18 1 0 60 79
1 18 0 0 60 78
1 18 1 0 60 79
1 17 1 0 60 78
1 17 0 0 60 77
1 17 1 0 60 78
1 17 1 0 60 78
1 17 0 0 60 77
1 17 1 0 60 78
1 17 1 0 60 78
1 17 0 0 60 77
1 18 1 0 60 79
1 18 1 0 60 79
1 18 1 0 60 79
1 18 0 0 60 78
1 18 1 0 60 79
1 18 1 0 60 79
1 18 0 0 60 78
1 18 1 0 60 79
1 18 1 0 60 79
1 17 0 0 60 77
23 km/h (6th gear)
1 17 2 0 68 81
1 17 2 0 69 82
1 17 2 0 69 82
1 17 2 0 69 82
1 17 1 0 69 81
1 17 2 0 68 81
1 17 2 0 68 81
1 17 2 0 68 81
1 17 2 0 68 81
1 17 1 0 68 80
1 17 2 0 69 82
1 17 2 0 68 81
1 17 2 0 68 81
1 17 1 0 68 80
1 17 2 0 68 81
40 km/h
1 2B 4 0 70 9F
1 2B 3 0 70 9E
1 2B 3 0 72 A0
1 2B 3 0 72 A0
1 2B 4 0 72 A1
1 2B 3 0 72 A0
1 2C 3 0 72 A1
1 2C 4 0 72 A2
1 2C 3 0 72 A1
1 2C 3 0 72 A1
1 2C 4 0 72 A2
1 2C 3 0 72 A1
1 2C 3 0 72 A1
1 2C 4 0 72 A2
1 2C 3 0 72 A1
1 2C 4 0 72 A2
1 2C 3 0 72 A1
1 2C 3 0 72 A1
60 km/h
1 40 5 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 41 4 0 74 B9
1 41 6 0 74 BB
1 41 4 0 74 B9
1 40 5 0 74 B9
1 40 5 0 74 B9
1 41 5 0 74 BA
1 40 5 0 74 B9
1 40 5 0 74 B9
80 km/h
1 56 7 0 77 D4
1 55 6 0 77 D2
1 56 7 0 77 D4
1 55 6 0 77 D2
1 56 7 0 77 D4
1 56 6 0 77 D3
1 56 7 0 77 D4
1 56 6 0 77 D3
1 56 7 0 77 D4
1 56 6 0 77 D3
1 56 7 0 77 D4
1 56 7 0 77 D4
1 56 6 0 77 D3
1 56 7 0 77 D4
1 56 7 0 77 D4
1 56 6 0 77 D3
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