I found this topic in LT-1 Tech and im not really getting any responces (probably because im "leaching" of the original topic )

Well long story short. I would like to make my own PC to ALDL cable (to save some money) and i was wondering if i could use the interface to do any programming with a program like LT_1Edit.

Topic in LT-1 Tech: Topic

ALDL Schematic in Question: ALDL MONITOR

Edit: What about the 10K Ohm Resistor between A and B? will that be needed for my car?

Thanks alot,

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T.C.

1994 Polo Green Camaro Z-28 A4
Modifications - Honker CAI, B&M Trans-Kit, MAC 1 5/8" Shorties, O.R. Y-Pipe, CHM Cutout, MPP2 Electric Cutout Plate, LT-4 KM, !AIR, !TB, !CAT, !TBAF, MSD 8.5MM's, MSD Coil, and a Bunch of Poly Bushings.
Best times: 13.97 at 101.06 MPH w/ a 2.26 60' and a 1.2 RT at Milan Dragway In Michigan
AIM : OneFireForU
My Camaro Site

[This message has been edited by MyGreenBabyZ (edited August 06, 2002).]

 

If you can use it for diagnostics successfully you should be able to use it for programming.

From the looks of that article you would not need it.

But since we do have a Computer Diagnostics and Programming forum and neither your question or Mikael's question were posted there i think it would be appropriate to try in that forum, so i'll move this there.

Thanks.
Ken

 

I use the "Two-transistor interface" that can be found here:

http://www.andywhittaker.com/ecu/aldl_hardware_cont.htm

Use it for reprogramming and diagnostics, works great.

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95 Z28 A4 Stock(for now)

 

Stock Z,
I think it was fred that said the two transistor interface is not as reliable as the interface using the MAX232 chip. i REALLY REALLY can not fry my PCM, its not in the budget. for now i plan on using this interface for diagonostics and perhaps later for a little bit of tweaking.

Thanks

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T.C.

1994 Polo Green Camaro Z-28 A4
Modifications - Honker CAI, B&M Trans-Kit, MAC 1 5/8" Shorties, O.R. Y-Pipe, CHM Cutout, MPP2 Electric Cutout Plate, LT-4 KM, !AIR, !TB, !CAT, !TBAF, MSD 8.5MM's, MSD Coil, and a Bunch of Poly Bushings.
Best times: 13.97 at 101.06 MPH w/ a 2.26 60' and a 1.2 RT at Milan Dragway In Michigan
AIM : OneFireForU
My Camaro Site

 

The most commonly used interface for diagnostics & programming is found here:

http://www.mindspring.com/~amattei/aldlif.jpg

You do not need the 10k resistor between A & B. Only MAF TPI cars need it (and others using 160 baud and other software, but let's not go there right now ).

Carsten's interface should work OK on a 94, but I'd be hesitant about using it on a 95+ car. The ALDL signals are slightly different on a 95+, and you can get in to trouble pretty quick. Been there, done that, got PCM guts on my hands to prove it.

As for the 2-transistor, it does work, but it's not a slam-dunk for working every time. That's why I don't use it. The MAX232 based circuit is a slam dunk.

HTH,

Andrew

 

Thanks Andrew!

by the way. is it possible for me to use Cat5 cable between the rs232 on the computer and the aldl interface? if so what is the maximum length i can go? if i cant use cat5 cable what is the best suited cable for the job?


thanks again,


------------------
T.C.

1994 Polo Green Camaro Z-28 A4
Modifications - Honker CAI, B&M Trans-Kit, MAC 1 5/8" Shorties, O.R. Y-Pipe, CHM Cutout, MPP2 Electric Cutout Plate, LT-4 KM, !AIR, !TB, !CAT, !TBAF, MSD 8.5MM's, MSD Coil, and a Bunch of Poly Bushings.
Best times: 13.97 at 101.06 MPH w/ a 2.26 60' and a 1.2 RT at Milan Dragway In Michigan
AIM : OneFireForU
My Camaro Site

 

Cat5 is good up to 330ft, without any problems......I believe Cat5E has better insulation so it might be better to use in a car.....

I don't know if you can use it to make a cable though....??

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1997 White Z28
SLP C.A.I
SLP Cat-back Exhaust