Diagnostic Interfaces

[jtgh]

must be fun looking at the actual machine code in your rom.
I will add that to my list to check all upper and lower limits,
and to see if they are flagged, like this ECT with code 70hex.

your are only looking at snippets and never get the whole rom to see at once?
i have more experiece with ICE and not the logic analyser.
be cool to have hex or binary image of your rom.
or even a full dissembly , but i know how hard that is to get data and code seperate.
blush , mostly on old intel. uP.

have a great morning, jerry

[jtgh]

yes TPS (accel and decel , enrich and fuel cut) delta TPS.

[Rhinoman]

The code is all on the website but it might not be obvious that theres a clicky. There are two main files, the disassembly and another file called what_I_Know which has some notes in. They are both a little bit out of date. I also need to recheck where I have LSR instructions, I think that I translated some as Left Shift Register (PIC code) and not Logical Shift Right (Motorola code).
The ECU schematics are there too in Seetrax format, I haven't exported them to bmp

[Rhinoman]

I've rechecked the code. I think that L005A is the O2 sensor voltage multiplied by 2.

[jtgh]

way cool.
i will test it out , by hook or crook.

even if i have to play a propane torch on the end of a real sensor, can do that too.

or pull data off running enigne. 2 choices, then simulation last.

you are right an offset signwave is best.
my guess. ?

[Rhinoman]

I have the exact formula for the battery voltage monitor. It is derived from a 33K/12K potential divider. So the battery monitor is battery voltage * 13.653.
To get battery volts, the output from the diagnostic interface is divided by 1/13.653 = 0.07324. We were very close with our measurements.

[jtgh]

your measurement is exact. coorelation, proven both ways.
thanks !

o2?
if $005a 02 x2 which is OE command.
0F = MAF ( I wonder if MAF is 16 bit , if true what is its cmd port#)
10 = (injector plus width ?) it cuts to zero at red line too.

[jtgh]

i updated our page

addr-hacking1a

i am still fiddling with VSS and O2.

[Rhinoman]

12 is MAP - MAP is 8 bits only.

10,11 is a 16-bit word at L00FE,FF - maybe injector pulse width.

Incidently my ECU is from a year 2000 model. The 1998 on 1st gen Vitaras (Santana built - not available in US) all have EPROM ECUs.
The ECU has a sticker that shows

33920 -70E10 = model number
70E1 6T = something else
E2T47472E = the second E means EPROM.
9514 = serial number

There are also letters other than E. I've not played with enough to work out what they mean. Some may be One Time Programmable devices, others may be reprogrammable FLASH.

[jtgh]

thank you,

addr-hacking1a

rev 3