I got an email today with a great link. AutoZone posts wiring diagrams for many cars and trucks for free. It also has a vast amount of repair information, including diagrams of part locations, detailed instructions, etc. If you don't have a repair manual for your car, you can just about get by with this all by itself. However, not all cars are covered by this service. You'll just have to look and see if yours is.

Follow this link: www.autozone.com/shopping/vehicleSelect1.htm. Then select your year and make/model of car. I went ahead and registered, but I think you get all of the same resources without registering. However, I have saved my car's information, so when I login again, I can just select the car I want without having to re-navigate the car selection.

I had a hard time finding the wiring diagrams, so to specifically find those, do the following:

• Locate your car, year, make and model.
• Select "Repair Info" at the left side of the screen.
• Then select, "Vehicle Repair Guides" -> Chassis Electrical -> Wiring Diagrams
  

I was able to locate my ECU diagram (mine's called PCM), my oxygen sensor signal wires, all of my other sensors etc.

Also, if you look up your MAP (Manifold Absolute Pressure) sensor (for instance), it tells you which kind you have (DC voltage or frequency type), and even tells you what resistances = what pressure readings in the ECU. The same goes for it's entry on the CTS (Coolant Temperature Sensor). It tells you what temperature = what resistance from the sensor. This will help you enormously in using the Tuning For Mileage article.

The wiring diagrams are pretty awesome. And the repair instructions cover just about anything you'll need. There is also an automotive glossary that is pretty huge (I bookmarked it separately). All in all, this is a great site and resource for us.

Update (4 May 08):
It appears that many guys cannot get their diagrams at AutoZone. We have a forum member who has access to wiring diagrams and sensor data at his shop, and has offered to look them up for guys who need the data. Please try Autozone first so we can minimize the need for personal intervention (and it's also going to be faster). But if Autozone doesn't havet the info for your vehicle, then see the following post: http://www.fuel-saver.org/showthread.php?tid=216

Update (24 Aug 08):
This is covered in other places, but you can buy your complete wiring diagram from http://www.ahdol.com. For $6.00 you can get any individual diagram. And for $12 you can get all the diagrams for your car. I recommend getting them all. I don't know how many times I've referred to mine for various projects, but it's a lot.

"We're sorry, but we do not have component location information for your 2005 Toyota Truck RAV4 4WD 2.4L SFI DOHC . We're always adding to AutoZone.com, so check back soon!"

Were you able to find your wiring diagram?

I was able to find my wiring diagrams, my CTS, MAP and oxygen sensors, and my heater fan. All had diagrams and detailed instructions for testing, removal and installation. I was impressed to say the least. Hopefully your experience is the exception.

Nope, apparently they don't like Toyotas.

We're sorry, but we do not have component location information for your 2005 GMC Truck Sierra 1500 4WD (5.3L SFI Flex Fuel). We're always adding to AutoZone.com, so check back soon!

I think they only have Mike's stuff.

colchiro Wrote:I think they only have Mike's stuff.

Well, that's the important thing!

Ok, I guess we won't all burn our Haynes manuals just yet...

I found the wiring diagram for my 2000 Taurus, my 1995 Toyota Pickup, and also my dads 2000 GMC Sierra they had all the 02 sensor wiring diagrams and all the info I needed to get the EFIE on the cars right at the ECM. Even told me were the ECM was located at in each vehicle.

My 1995 Intrepid info was also on there. I have a Chilton’s manual for it already but it is nice to see that there is allot of good info on that site. Have it bookmarked and I am sure I will be using it again.

Regards
Zeek

Great site, and great find!

This site alone will be a treasure for those who may wish to install EFIE's and such on several different vehicles. WOW.