no connection

sparks454 · Post by **sparks454** » Wed Jan 15, 2014 1:36 pm

Hey guys. Been using TunerPro for quite a few years now without issue. Built my own cable which I have been using as well. Worked on my 7165ecm before and will not work now at all. Used a single transistor cable to connect to ports E(gnd) and A and B for data. This is an '87 GTA. It's built to use a serial port but then I bought a serial to USB converter without success. Any thoughts? Laptop recognizes the USB cable connection and it does show up as COM6 in TunerproRT 'Acquisition' tab as a connection choice. Device manager shows the port being active as well. Tested my cable with a meter and checks good and tried another 165 ecm as well. Have .35-.45v cycling between ports 2 and 5 on the db9 connector and 1.2-1.5v cycling between the base and emitter on the transistor.

Also failed the cable check test in TunerproRT.. Can't detect cable. I also tried reloading the TunerProRT application. No luck..

Let me know what you think..Thanks, Chris
[/img]

Post by **Mangus** » Thu Jan 16, 2014 1:53 pm

For other GM OBDI applications, specifically 8192 baud, data is on pin M of the ALDL connector. Also, don't forget that you need 10K between pins A and B on the '165 in order to get data.

sparks454 · Post by **sparks454** » Thu Jan 16, 2014 2:15 pm

Thanks Mangus..Yep, the 10k resistor is actually wired into the cable I made. I have also tried port M and E both with no results..Cable worked before, and it shows, or at least appears with the voltage measurement on the connector, that data is being sent. I was thinking it was the software and went so far as to even have a new main pcb put into the laptop..No success. Am I missing something else in the software setup? Chris

Post by **Mangus** » Thu Jan 16, 2014 2:27 pm

With the cable disconnected from the vehicle, but still connected to the laptop, does the cable test button in the data acquisition plug-in configuration screen return success?

1.2v is pretty low, however, testing signal voltages with the average multimeter may not yield expected results, as the line switches fast, and the meter usually buffers for some time, causing it to return a value in between the peak-to-peak voltage that actually exists. If you have an oscilloscope, that would be more telling.

Do you have a friend with a known-good cable?

sparks454 · Post by **sparks454** » Thu Jan 16, 2014 2:32 pm

I have not plugged the cable into the serial port and ran the test in TP..I can do that. Nobody near here with a cable though..Let you know shortly.

sparks454 · Post by **sparks454** » Thu Jan 16, 2014 3:52 pm

CAble test does not pass regardless if it's hooked up or not to the laptop..USB to serial adapter, straight to serial port,,etc. Never passes even with no cable.

Post by **Mangus** » Thu Jan 16, 2014 3:58 pm

It wouldn't pass with no cable. However, if it's not passing with the cable attached and the port set to match your serial port, then something's wrong with your cable.

sparks454 · Post by **sparks454** » Thu Jan 16, 2014 4:20 pm

CAble test does not pass regardless if it's hooked up or not to the laptop..USB to serial adapter, straight to serial port,,etc. Never passes even with no cable.

sparks454 · Post by **sparks454** » Thu Jan 16, 2014 4:25 pm

Pulled the cable apart. Resoldered and replaced the transistor again. Between base and collector I see spikes from 0-3.8V showing data xfer.
On the db9 connector i have a near steady voltage of 0.698v. Still fails the cable test in TP..I am using the 1 trans cable that I have always used with TP. It does work with WinALDL.

This is the cable I am using and have been using for years with other versions of tunerpro at 8192 and it has worked just fine. Still ok to use this one?

http://winaldl.joby.se/aldlcable.htm