Pin 9 to PCM pin D30, pins 4 & 5 to ground, pin 8 to keyless entry, and pin 16 to +12 ignition, Pin 8 to PCM D20 is used by the factory and high priced dealer scanners, nothing on the retail.
Check out this Tech article where we show you how to take a junkyard wiring harness and turn it into a custom LSX wiring harness build!Īlthough it takes time, it is worth the wait! Nov 08, Pin 4 & 5 - GROUND - Usually only pin 5 is needed, however some scan tools/code readers will need GROUND on pin 4 as well. All OBD2 port's for LS1, Vortec Truck are the same. Any of these top rated scanners on Amazon will work: OBDii OBD2 scanner read reset. To reset the Check Engine Light / Service Engine Soon Light all you need is a 15 dollar scanner. Here is the list of the best-selling OBD-II scanners that you can use. Find best value and selection for your LT1 LS1 ALDL OBD II Diagnostic Port Wiring Connector search on eBay. In order to troubleshoot your car, you will need a diagnostic scanner. Gen II, Gen III and GenIV small block V8 applications - Throttle Body, Tuned Port, LT-1, LS-1 and Ls-x Vortec Fuel Injected engines, including LS2, LS6 and, and / / / Vortec, and Direct Injection GM car, truck and SUV engines. We were able to snap a cheap wiring harness, from a LS truck (1) OBD2 connector/port, GM #, Mouser Electronics.Wiring Harnesses for Fuel Injected GM / Chevrolet engine swaps - Stand Alone Wiring Harness for Gen I. First off, the OBD2 Port Plastic Connector, 16 Pin,, , 1. I use this same basic setup for LT1, LS1, Vortec Trucks etc. two grounds, we take it from the original LS1 car dash harness? All models and manufactures must meet the bare minimum criteria which includes looking up fault data, engine data and other diagnostic information. We were able to snap a cheap wiring harness, from a LS truck (1) OBD2 connector/port, GM #, Mouser Electronics.Ĭonversions & Hybrids - OBD2 Diagnostic Plug Wiring - I used a reworked that the general rule is that OBDII ports have 4 wires. OBD2 has a major difference in the interpreting of this data compared to ALDL, its all standardized therefore it is very simple to understand. I use this same basic setup for LT1, LS1, Vortec Trucks etc. Performance Tool W1189C SAE Offset Distributor Clamp Wrench. Tip:Borrow your Girlfriens/Wifes cutex and make a mark on one side of the connector that runs to the OBD2 Connector, that way when you.
Start by removing the sticker on ELM327 Cables Enclosure, remove the 4 screws with a smallish star screwdriver. The ALDL interface circuit components soldered to board: This item: Actron CP9127 AutoScanner ALDL Cable Kt, Black. (regrets) im sorry to report this but i have been down this road and am sorry to report that your car (along with some 94,early 95 model gms)were in a trasition of changing over from obd 1 to obd 2 and even though you have what looks like a obd 1 connector,the paper clip grounding the two clips together method. Step 1: Prepare the ELM327 Board to Bypass the USB Bridge Chip. Here is a picture the resistors, transistors, diode and DB9 connector:
This circuit consisted of two transistors one connecting the "ALDL data" to "RS232 Receive", the other connects the "RS232 Send" to "ALDL Ground". 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).
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. the VT for example has a module called a PIM, which essentially reads the OBD2 PIDs it needs from the ls1 PCM (such as coolant temp, Inlet air temp, Check engine light status), and stores the values, then constructs an ALDL packet from those values and forwards it to the dash, which speaks ALDL only. Holden Commodores from VT-VZ (1997-2004) do not primarily use the OBD2 protocol but instead use a ALDL. 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. All other body data is handled by the lesser utilised ALDL to communicate with the body control module, radio, climate control etc. 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.