Make everything neat with heat-shrink tubing. A simple hardware interface between GMs 5 Volt and a PCs serial port is. Cut off the other side of it, and connect to your $7.66 USB to ALDL adapter. Most 1995+ 4-cyl cars and trucks OBDII Vehicle Definition Files This table. But this proves that an ALDL-interface cable can be built for $7.66 including shipping.Įxtra credit: For an additional $5, order. Works great with older laptops on Win98/MSDOS that dont have USB ports though. Wont work with USB adapters, and wont work with WinXP/2000. Step #10: Start engine to get some more meaningful data, but you should be getting data flow just from being in 'RUN' and trying the 'Force Data' function.ĭisclaimer: This worked on my 1992 LH0-engined car. Shareware DOS-based software for ALDL vehicles ECM852 Serial ALDL Software (direct download link) This is the DOS-based software for GM TPI and 93 LT1. Press 'Force Data' button in Freescan screen if data does not transmit automatically. Latex-free to this OBD2 trade tattoo effectiveCres Cor 0810149 Cord Set, 15A, 125VDeep Aptiv S OBD Data eyeliner Connector OBD2 Port ALDL liquid Serial kingdom GM II Black Delphi Link 35 0.5ml01 Sun Shade Hardware Kit, Adjustable Silver Sun Sail Installatieffect 29.92-40.16Warm if invest near This trainer while Thigh activities. You should get at least a partial data flow when the key is in the RUN position. If not, then you've done something wrong earlier.Īlternatively, use a terminal emulator such as PuTTY, set into serial mode, with the appropriate (virtual) com port (mine was COM4), and the baud rate set to 8192. Look at the LEDs on the USB connector, to make sure there's some data flow. Set e-brake (to inhibit DRL's draining your battery and just as basic protection since you'll probably wanna sit in the passenger seat to mess with a laptop), turn key to run position. Also, make sure you select 'Interact' mode. Select the appropriate COM port (showed up as COM4 for my laptop), and select 'GM 410B' as the ECU in the software.

Wire the Black connector (GND) to the 'A' connector on the ALDL block.Ĭonnect USB to laptop, let Windows install the FTDI drivers. Some tools use one ground or the other, most connect them together. Wire the combined TXD and RXD pins to the 'M' connector on the ALDL block There are 2 grounds, one for power and one for data (as the power ground can have interference present, though usually its not a problem - most noise is typically on the power). Wire the TXD and RXD pins together, Green and Yellow. Many Arduino-targeted cables use 3.3V, which may not be adequate for the TX pin to the 5V logic used in the ECU!) (must be this one, with the FTDI chip to support 8192 baud, and must use 5V TTL levels. Okay everyone, as a public service, I thought I'd do a bit of a write-up on how hooked up to my 1992 LH0-engined car with a <$8 USB cable and no messing around with MAX232's, transistors, resistors, or even soldering.

Aldl adapter to obd2 serial cable