Diagnostic Interfaces

[TheZuke!]

Originally Posted by TheZuke!

But I might just consider installing the rear wiper and rear washer
from the donor Tracker to TheZuke!

While trying to remove the Rear wiper motor and rear washer jet
from the donor this morning...

a: I didn't have a big enough Phillips screwdriver to remove the motor.
(or a vise-grips, or a portable dremel, or a cutting torch).

b: I discovered the washer hose is behind a metal panel in the
headliner (probably welded).

But I did manage to get the Fuel Injector Rail plug, and a few trim
pieces for a dollar!

[jtgh]

live from ECU on car wow.

will it run thru my interface.?

the one i have communication perfectly ,now.

do you have exe code ?

Id like to run it.

its not dodgy it's a work of art !

cheers.

[Rhinoman]

The code works with my diagnostic scanner that interprets the Suzuki protocol into the protocol that I have used on my own design of ECU. I intend to use similar code to make the later stock ECUs reprogrammable over the diagnostic link. I have also done it this way to be enable it to be expandable to OBD2 and CAN protocols as well. To be able to scan the diagnostic link to determine what protocols are available requires an active interface. The PC software will be published once it has been tidied up and can be modified to suit any interface. At the moment it is a bit rough and has no exception handling.

[TheZuke!]

Originally Posted by TheZuke!

While trying to remove the Rear wiper motor and rear washer jet
from the donor this morning...

a: I didn't have a big enough Phillips screwdriver to remove the motor.
(or a vise-grips, or a portable dremel, or a cutting torch).

b: I discovered the washer hose is behind a metal panel in the
headliner (probably welded).

But I did manage to get the Fuel Injector Rail plug, and a few trim
pieces for a dollar!

Well, I did get the RW wiper from the donor and installed it before the
autumn rains. I did have to re-wire the dashboard switch, although
the 97 donor has the same connector, the wires were transposed.
But I'm not going to bother with the RW washer jet, I really don't
want to cut the sheet metal.

TheZuke!

[Rhinoman]

I've been bashing away at the disassembly.
I'm pretty sure that address 16 is the short term fuel trim and 17 is long term fuel trim. 16 is derived from the O2 sensor reading, 17 is related by 16 by a bit of maths.
Open loop/closed loop flag shouldn't be far away.

[jtgh]

you are amazing. that is wonderful.
our list is nearly full. surely all the important are found.

i got delphi 2006 Dev. Sudio Arch.
and
WSC4D ver 4.3 , Windows std, Comm. Library for delphi too.
so im on a coding frenzy,
it will be on my web page and full disclosure, code, hardware, schematics, ALL!
So if someone wants to copy this idea they can. (hackers delight)
they want a lic. fee. so Im still looking for some Open source lib ,so it can be shared Open source.
but this will keep we busy on cold winter nights.

cheers.

happy bashing ! and Happy trails

[Rhinoman]

I've yet to see any published schematics for a diagnostic interface that aren't very poorly designed. Most use a 7805 regulator which shouldn't be used on any automotive supply. The rest make no attempt to meet the IO signal levels required by the different specifications. The Suzuki interface (from analysing the circuitry) should be 0->1.8V logic low, 3->5V logic high.
Delphi isn't very popular but there should be plenty of free comms routines about. Did you not get your C++ IDE? the comms routine that I supplied you with is well proven.

[jtgh]

you are correct the elect. interface , most are poor.
one can make a stand alone power filter then feed that to the off shelf adaptor cable.
thank you for the transceiver threshold levels. VIH, VIL. i have looked at my I/o yet.

delphi is not popular(emaracadaro now) but their new company has the compiler on their web site for free , free to non commerical usage. NOw we are talking.

id did not notice them the comms routines. will look today. THANKS ! for that.

i tried to find your compiler and all i could find, is people selling used NIB for $100
it seems its out of stock and all the snarks want money for theirs.

id did massive search too. even posted wanted on craigs list and usenet,etc.
and on many compiler forums. (only sharks resonded, get rich quick types)


thanks for all.

jerry

[jtgh]

here are some good docs, and some refr.
it is 93 and dated, but today we have more robust power regulators from NSC, etc.
not near as frail as the ubiqitous 7805

http://download.intel.com/design/aut...s/21031302.PDF
and SAE-J1211 -section on transient noise. $69 to see spec. sadly.


400v worse case glitches on the supply, in vehicle.
they offer figure 26, as a solution.

pretty much the worse case is Alternator dump(looseterm. of battery is worse case)
then the A/C clutch , tops things out. as the worse solenoid in a car.
some USA Delco Alternators have zener diodes in parallel with the 3 phase diode rectifiers packs. This helps a lot.

my Megasquirt looks like a Intel Application in action, and many deployed.
holder of some land speed records too. (ECU in action)

my stock ecu uses a 100uf 63v cheap cap to control this line.

ALDL link:
the Rs232 to TTL232 ALDL can be sourced from the car, a 9v battery dry cell or from the
RS232 buss itself, as i have. it uses the unused modem control lines and sets them to EIA +12v and this passes thru two diodes to the level shifter circuit i bought.

the nice part the MS2 uses.
the input is good to 60v transient, unlike 35v on 7805s
LM2937ET-5.0
here is the MS2V3 reg:
• Fully specified for operation over -40°C to +125°C
• Output current in excess of 500 mA
• Output trimmed for 5% tolerance under all operating conditions
• Typical dropout voltage of 0.5V at full rated load current
• Wide output capacitor ESR range, up to 3
• Internal short circuit and thermal overload protection
• Reverse battery protection
• 60V input transient protection , 26v continous
• Mirror image insertion protection
thermal over load protection

1oz , 1sq inch of copper natural heat sink at 25c amb. one can get almost 3 watts out of this guy.

then NSC even mentions battery jumping !
LM2940C| Datasheet | Datasheet 2.0

hope you find show an tell fun.
cheers.

[TheZuke!]

Rhinoman and jtgh,

I keep reading your posts on this thread, and
I'm overwhelmed. The two of you have done a
lot of work to read and decode the ECM.
I'd love to be able to do it to TheZuke! but
I'm not sure where to begin anymore,
I'd sure hate to "re-invent (your) wheel",
but I don't feel I'm anywhere near your league
to be counted in the game.

Okay,
I'm an erstwhile Electronic Tech,
I've got a bunch of my old gear
(DVMs, Oscopes, PSs, an 8bit logic anl, Fn gens, pulse gen,
audio gen, a drawer of chips,
a couple of SDK's (8080, 8085, 80386, MC146805, AVR).

As I see it, I need to build a serial interface (with a
non-std baud rate) that also changes voltage levels,
has a unique connector,
and attach that to a computer with some
comm software and s/w interface for logging.

Is that about it for now?

TheZuke!