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ALDL cable gives random data
Posted: Mon Dec 30, 2019 9:52 pm
by weezlebub
I have VY commodore and I built 2 transistor ALDL to serial cable and using 1.05 adx file from this site. when I use tuner pro rt it connects and makes tune on car but all the data showing through the software is all random and its not indicating any data errors. is this common with 2 transistor cable do i need to build max232 cable instead or maybe shorten wires from the ODBD port theyre about 30cm long at the moment. I tried reconnecting a lot of times but it always shows random data
Re: ALDL cable gives random data
Posted: Tue Dec 31, 2019 8:44 am
by j_ds_au
weezlebub wrote:I have VY commodore and I built 2 transistor ALDL to serial cable and using 1.05 adx file from this site. when I use tuner pro rt it connects and makes tune on car but all the data showing through the software is all random and its not indicating any data errors. is this common with 2 transistor cable do i need to build max232 cable instead or maybe shorten wires from the ODBD port theyre about 30cm long at the moment. I tried reconnecting a lot of times but it always shows random data
I presume you have a V6, otherwise the VY PCM/ECU doesn't talk ALDL. You might try using the OSE Flash tool here to read the cal and check if you get consistent cal data back, that will validate your ALDL interface.
Joe.
Re: ALDL cable gives random data
Posted: Tue Dec 31, 2019 8:48 am
by antus
Yep your not the first person to have trouble with the 2 transistor circuit. Im not sure if it works at all.
there are some other threads about it but with no successful resolution.
Re: ALDL cable gives random data
Posted: Tue Dec 31, 2019 5:58 pm
by weezlebub
thanks didn't have any luck with flash tool it was just waiting for heartbeat and wouldn't connect. Have a max232 so will try build a cable with that instead.
Re: ALDL cable gives random data
Posted: Wed Jan 01, 2020 4:49 pm
by delcowizzid
Vx vy is tricky they need very good timing and filtering in the cable to get a connection due to the limited time between packets from all the modules. Best off just buying the aldl cable off here. I've tested even the cheap ttl to USB boards and they are to slow on vx
Re: ALDL cable gives random data
Posted: Thu Jan 02, 2020 5:32 am
by j_ds_au
delcowizzid wrote:Vx vy is tricky they need very good timing and filtering in the cable to get a connection due to the limited time between packets from all the modules. Best off just buying the aldl cable off here. I've tested even the cheap ttl to USB boards and they are to slow on vx
Yeah, timing is tricky via USB. Sometimes tweaking the USB latency setting helps. Other USB drivers installed like com0com can also cause problems.
OTOH, if wb is using a real serial port, timing tends to work out better.
Joe.
Re: ALDL cable gives random data
Posted: Sat Jan 04, 2020 10:03 am
by weezlebub
Unfortunately i am still having the same issue after building max232 cable.
I use the schematic
http://www.techedge.com.au/vehicle/aldl8192/8192hw.htm.
I left out resistors r2 and r3 cause my vy series 1 v6 doesn't have those pins on the car. Is that right?
Wondering if i got wrong setting somewhere
Re: ALDL cable gives random data
Posted: Sat Jan 04, 2020 11:22 am
by antus
The diode on pin 12 used to be backwards on that diagram and i think still is. Try flipping it around. What usb interface are you using? Many cant do 8192 baud.
Re: ALDL cable gives random data
Posted: Sat Jan 04, 2020 12:03 pm
by weezlebub
Ok I will try diode flip. I'm using a serial port on the dock of my dell laptop. It has 9600bps as default speed in device manager but i assume it is able to use 8192bps if software requests it?
Re: ALDL cable gives random data
Posted: Sat Jan 04, 2020 12:18 pm
by antus
If its old enough that its a genuine 16550 chip behind it then it will. If its a built in usb to serial then itll be no different to needing a compatible usb adapter.