Since the first circuit performance wasn't great and the whole thing was messy, instead of refining the first circuit i thought i should try a new design. This circuit worked, but for some reason the response was slow, i couldn't make it work with a Usb-to-Serial converter, and on some PCs you can't take power from Pin4 so you have to connect it to 12v external power source (the resistor stays).
Aldl to usb schematic Pc#
The simplest ALDL interface circuit i could find consisted of one transistor and two 10k resistors it simply connected the data pin on the ALDL plug to the RxD(Receive Data) port on the RS232 on the PC through the transistor. Īldl has a port for sending data and the RS232 on PC has a receive data pin (RxD) so the easiest way is to connect them directly but since each system uses a different voltage we should put a transistor between them. Car shuts off 10 times a day ive replaced cam and crankshaft sensors, purge solenoid, plugs, tcm,and pcm and still same stuff.
Aldl to usb schematic install#
I've always wanted to connect my laptop to my GMC van OBD1 based ECU, a little research on the internet lead me to a simple circuit that could make that happen. ALDL USB Driver Pack for Windows Posted by - NA - on 29 January 2013 11:17 PM Once you install these drivers OBD software should successfully detect your ALDL cable, and hence connect to your car also. Aldl usb cable schematic here is a list of pinouts associated with 16 pin j1962 obd 2 car proprietary obd ii to usb cable pinout obd 2 14230 4 kwp2000 simple.
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