was checking the grounds and saw this one. correct me if im wrong, is it the ECU ground? http://s549.photobucket.com/albums/i...t=DSCN1607.flv

 

Yes it is, locations can be found here if you haven't search already:

http://www.aaroncake.net/RX-7/grounding.htm

 

i looked over that page. i just wanted to be sure since the ECU ground on that page was a little unclear. thank you

 

actually from the looks of it that looks like the ground that goes from the firewall to the bellhousing. Just to be sure can you see if it runs to the firewall? Also is there two black wires that connect to the ring connector.

 

The ECU ground on a series four car is found on top of the rear rotor housing and cannot be seen without removing the upper intake. It is the two wires in the *ring* terminal shown in this picture attached. Those two wires go to the internals of the ECU via the EM harness.

The wire b/t the chassis and transmission is a bonding wire. Bonds the engine to the chassis. Talking the wire that is attached near the wiper motor to the transmisison.

 

huh. then what ground did i come across with

 

The ECU ground is unclear on my writeup?! Seriously? I had to disassemble a spare car to get a good picture, then ask the forum for pictures of S5 grounds. Is there any way I can improve the writeup, in your opinion? What part of it is unclear?

 

Aaron if I may make a small suggestion? I have seen this on several sites where individuals such as yourself provide a HUGE benefit to the community.

Basically you post a static image of semi-small size...and truth be told, yours are much better than the small pictures on the RR site. What would be great is if you installed a script such as lightbox so when an image is selected, a larger version appears.

If this interests you, I could take the time to help you with it. I hope you understand this is not bitching at all as I'm quite appreciative of your site...just something that might make it even better. =)

GG

 

The images are 640 x 480.

 

In a world of 21" plus monitors that is not a large image. =)

As stated...much better size than on a number of sites however. =)

 

Helped my find my ground with ease o.O

 

The best I can tell, that is just a braided bonding strap going from the engine to?????????? NOT a ground for the ECU. Sorry, I have never looked at AARON CAKES site. I'll look today or ???

The picture I attached is most certainly the grounds for the internals of the ECU on a SERIES FOUR car. I own not a series five but know they are a bit different in the location(s).

Also I have no idea what series car you have. Was not stated on the thread.
************************************************** ************************************************** ************************************************** ********************

EDIT: I looked at Aaron Cakes site and can see why you are unsure about the ECU gnd on a series FOUR car. That picture looks more like a bonding strap than the ECU ground shown on my jpg and Cakes second picuture of a series FIVE ECU ground. I'd suggest removing that first picture and replacing it (the one showing the series four ECU ground).

Other than that his site looks like something I could learn a thing or two about. One suggestion is to show how to check voltage drop b/t the *B* terminal of the alternator and the positive post of the battery with the meter on volts dc. One lead on the alt B post and the other lead on the battery positve post. Then with the meter still on dcvolts ..one lead on the chassis of the alternator and the other on the negative post of the battery. If memory serves the voltage in both case shouldn't be over 0.02 vdc (memory). If it's a lot higher it indicates a bad connection b/t thealt and battery and or a bad connection of the alternators case to the engine and or engine to chassis. Something like that. I ain't no electrical sparky. Just a tire kicker.

And maybe a honorable mention that there are a number of wires internal to the harness that are mechanically crimped together. Like the brown/black wires that are ref voltage to the sensors in the engine bay. They all are crimped to each other somewhere in that harness and terminate at the ECU (pin 2A?). So I'm saying some of those crimps might be why a few cars out there have hesitation problem in transitioning to
the secondary injectors.

EDIT: See the following site and go half way down the page where you see the words VOLTAGE DROP. http://www.aa1car.com/library/charging_checks.htm That is what I was trying to describe earlier.

 

Yeah from the looks of it it faces the firewall of the car and does not connect to the rest of the harness under the UIM where the ECU ground would normally.

 

Thanks for the writeup. Clear to me. I Found the photos very helpful. Also big. However If someone cant figure out how to copy and save the photo and make it even bigger. Thats there problem

 

Except what is shown as the series four ECU grounds is NOT the series four ECU ground point imho.

 

the write up shows series four and five Ground locations! is that not right?

 

Aaron cake im sure knows his stuff... the series four location matches mine. so i dont think its wrong..

 

Let me guess. Someone grounded your ecu to the windsheild wiper?

 

His site does NOT depict the ground #24 for the SERIES FOUR ECU ground. It depicts *another thing*.

Ground #24 consists of two black wires on a ring terminal, that come from the EM harness and go to the ECU.

That's a bonding strap in his SERIES FOUR jpg, not the ECU grounds. His jpg of the SERIES FIVE motor shows the proper ECU grounds and is applicable to the series four as long as you leave off the second series five jpg.

I can type replys all day and night long. Piece of cake.

His series four jpg is too dark. The second jpg which is his series five ECU gnd is the same for the series four and if it were me I'd just chunk the first dark jpg and replace it with the second jpg attached.

FYI: I believe the second jpg is of a series four non turbo engine anyway. Not a series five engine. Has a blckoff plate over where the EGR was.

EDIT: Ah never mind. Both of those jpgs are of a series four. I'd still get rid of the first picture.