Hey folks, Doing an R and R on a 93 FD and the ECU harness was toast. New harness from Mazda has an additional brown connector. This is NOT the single connector for the fan test. Looks simular to existing connector which did not come out with the harness that is connected to the small control module. Do I need this?

 

I myself am not sure, i could guess with pics but i was just posting to say great job for restoring FDs i admire people like you. good luck

~Luke

 

Is it a small black connector? Do you have a pic?

 

Looks like an exact duplicate of the existing connector that goes to the small control module. This car was produced in 6/92 and seems to have an extra harness that connects to the ECU and the car and did not come out with the engine. I checked the old harness and it is not there. Something must have changed as these cars were produced. Looks like 5 wires utilizing a 16 wire connector. I will check to see if actually plugs into the small control module and get a pic.......

 

Here is the pic. Two connectors - 1 is plugged in to the control module and the extra one is in the new harness

 

Hmm **** idunno....
Where did you get the harness from and how much?

 

Harness is a factory Mazda replacement and you don't want to know how much......smile..

 

LOL~! Yeah those things are $$$ from the dealer.

 

Keeps getting better...Looks like the new harness has an additional connector for the small control unit and the fan test ground. So I have two of each. Seems like they were trying to eliminate the additional wiring harness that connects the blue connectors together. Anybody know about the development in this area?

 

When they did the cooling system recall, they added in a small jumper cable harness that went to the engine harness, chassis harness, and the black fan mod control box on the back of the ecu.


The new harness does not require the jumper harness to be connected to it as all is hardwired into the new harness. You should not have an extra connector.

 

I am also restoring my 93 that I bought after an engine fire. I am replacing the wiring harness this weekend (cross your fingers). I bought my harness along with some sensors from Malloy Mazda. Ray Crowe is my hero!
Anyways, I don't know about the extra connectors but I'll let you know what I find out.

 

Yes here we go I knew somebody had run into this. SO the small control unit is for the fans and I can remove the extra harness now? I will try this today and let you know. Thanks guys.....

 

Don't worry about the extra connector. I did mine and just left it, everything works fine.
I was told 2 possibilities for that connector. It's either the fan test or emissions. Either case it will not effect anything if left alone.

 

cewrk71 was correct. I was able to remove the extra harness and everything hooked up perfectly. Well we see if it works...

 

Car started no problems...wasn't this fan mod supposed to keep the fans turning after the car is turned off?

 

The fan mod box was installed for dealer testing. It just so happens to have a function that we can use.

If you ground out the single female spade ( not used ) wire connector from the module, two minutes before engine shutoff; then the fans will run for 10 minutes post shut down.

 

Gotcha, Man it's great to be back in the saddle again...Looks like air bleed is next. Idle a little unstable. How long before computer does it thing? Anybody?

 

It took a couple days worth of driving for my rebuilt engine to settle its idle down.