Thanks mate

 

Hopefully, I'll get my cable built today (damn real job slows me down!) and I'll be sure to post and let ya know. In addition, since I am doing all this troubleshooting, I'm killing my 20 records with Datamaster. Just curious if anyone has any success with WinXP in setting a restore point right before installing Datamaster, then once the 20 records expire, un-install Datamaster then do a system restore to a date prior to the 1st datamaster install, then re-install Datamaster again if that would restore 20 new reocrds.

Anyone?

Thanks!
Bill

 

I still have a few runs left

 

WinALDL does not transmit, but Moates' ECM852 or any other software that goes into 8192 baud mode must transmit to go into the higher bandwidth mode.

That is a VERY handy port on the ALDL connector. That's how I found out the issue with my fuel pump was a short in the wiring to my pump relay. My car would die after about 30 minutes of driving and strand me on the hiway. I think the short appeared once the engine compartment was hot. I applied 12v to pin G and drove home

 

That's a good point! I'm not ineterested in tuning right now...just scanning. When you say top transistor, do you mean the one that goes to pin E (Data) on the 88? So, this would mean I don't need the 2N2222 and the 1N4148...correct? I want to keep this as simple as possible...if possible!

Thanks!
Bill

 

Good luck Bill, look forward to your report

S'nut

 

So far on the 1st go round...I fried the transistor and the resistor. Trying again. I did forget the other resistor on the data line (wasn't being careful). I'll let ya know!

Bill

 

Again...no worky. Built the cable per the schematic above in this thread but I did not include the bottom transistor or the 1N4148 since I understand these are for programming and this makes sense since the pin attached to this wire on the RS-232 is labeled TXD which is a "transmit data" pin on the RS-232 and I only wanna receive.

The details. First attempt, I fried the top resistor transistor but forgot to add the 10K resistor that goes to the DATA pin on the ALDL (PIN E...I hope this is right for an 88!). Replaced the 10k, tried again. Without the car running, everything was fine...once I started the car, I fried once again, the 10K resistor that goes to the +12Vdc wire. My 12 volt power source is a typical cigarette lighter DC adapter and I use the ground wire from this and attach it to the wire that connects to pin A. This has power the whole time since the cigarette lighter always has power...car on or car off. It appears when I start the car...DC voltage increases just enuff to fry the resistor. So, I upgraded this resistor to a 1/2 watt (from a 1/4 watt), turned on the car. Walla...no fried resistor.

Thought I had it but no...of course not! The first pic shows that the com port tests ok from Datamaster and I assume the laptop sees the PCM. Cool I thought! Here's the PIC:



Then, I tried to record and Datamaster tells me it can't sync with the PCM. Here's the PIC:



Notice the "No PCM Sync, Recycling...4". This "Recycling" goes on and on until it times out. This happens with and without the resistor on ALDL pin B.

If the Test COM detects the PCM ok but the laptop can't sync up with the PCM for recording...this sorta tells me there is either a data "timing" or speed (BAUD) mismatch. I tried playing with some of Datamaster's timing settings also but no dice. Thoughts anyone?

FWIW, I'm using the Datamaster for the "86-88 Y-Body 5.7L PFI (L98) 8192 baud" which is DM35x32 according to Datamasters website. The link is here:

http://www.ttspowersystems.com/DM_Software.htm

Advice...anyone? This is my 2nd complete go around cable wise and I'm down to 12 records left on Datamaster. Fortunately, I have 2 other laptops so once I get it right...I'll install Datamaster onto another laptop and use it...so I have 52 records left.

HELP! I really hope I'm nut f______ up my PCM...I gotta cruise tomorrow! Any advice would certainly be appreciated!

Stingraynut...sorry to disappoint...but...we'll get there...I'm a persistent bastard!

Thanks all!!
Bill

 

Wish i could help. Your using the same ECM and same cable as me, yet i have no problem running the program. You are opening a file in the small box near bottom to record, right ??
What operating system are you using ?

 

Yep, I'm opening a file. It seems you have to or it won't go into record mode. I'm using WIN 2000.

Thanks!
Bill

 

Is there a help menu ?
I'm running win 98

 

Thanks for your report Bill, excellent - I'm sorry it's not working yet - I've got my fingers crossed for you. I have this feeling there's a problem with 88's - I also have the feeling that you're going to solve the puzzle - good luck

S'nut

 

Just on the subject of Operating systems, Does anyone else have it working on Windows 2000?? Isnt that what youre using StingrayNut? Could there be a problem with using Windows 2000??

 

The laptop I try uses Windows XP - but it's also been tried with a working computer and cable- ie one that does communicate with other vette's (Ben's in Brisbane)

At the time we thought perhaps there was a break between the ALDL socket and the ECM but I have now verified continuity, a couple of weeks ago when I swapped ECM's

S'nut

 

DataMaster software runs on the Windows 98, 2000 or XP operating systems and needs 800 x 600 minimum display resolution and one free serial port if data recording is used. It is recommended to have a 133 MHz or better Pentium-class system and at least 64 MB of RAM. DataMaster software requires 10 MB disk capacity for the first installation, and 3 MB for each additional version installed.

 

Heres the Datamaster manual. Maybe there is help there.
http://www.ttspowersystems.com/softw...cs/DM32MAN.PDF

 

Are you using a USB adapter ? Datamaster doesn't like them but does list 2 that work.

 

Ok, maybe this is the answer and I'm gonna try it! Datamaster suggests the following:

"Note to Early Corvette Owners (1989 and earlier):

Early Corvettes use different wiring of the ALDL connector than later GM vehicles, and require that pins E and M be connected together in order to communicate with DataMaster. Additionally, a 10K-ohm resistor must be connected between pins A and B."

This is the 1st I've heard of this! I'll give it a whirl and let ya know how I make out! I feel good about this fix. This makes sense since pin M is 8192-Baud Serial Data!

FWIW, it's not the PC operating system since my serial port is working fine as evidenced by the successful Test Com noted above. It is a synchronization issue in my little mind and the above my solve this.

I am not using USB.

Bill

 

Problem. Pin M on my ALDL connector has no connector in it to jumper pins E and M together with!! I only have electrical connectors in Pins A,B, C, E, F and G. Crappola!

This goes back to my initial question on the jumpering (or looping) of the pins at the RS-232 on the schematic Agent 86 provided. Pcolt94 indicated he would do some research on this jumpering on the RS-232. Pcolt94...any news? Datamaster indicates that this "jumpering" if you will, is ordinarily done at the PC adapter as well so maybe this is the answer.

So, using Agent86s schematic above again, it appears there is a jumper on the RS-232 PIN 4 (notice the black dot) but, I don't know what other pin to jumper pin 4 to? Could be Pin 1 and 6 but I'm not sure. Also, do I jumper pins 7/8 (this can't hurt anything that I can tell).

Anyone have any ideas?

Thanks!
Bill

 

Yeah mate ive read all that before. Operating systems are quirky things though, and Windows 2000 is one of the worst ones ever to come out. Lots of programs that wont work properly with it, and its just generally a very **** poor operating system. So i just thought id question that so we have covered every possible avenue.