Black7Conv

I installed the power fc in my 89 TII but the speed reading in the commander is not working.. also there is a wire in the extra ecu wiring harness (between the power fc and the stock wiring harness I use special harness in order to fit the stock harness to the power fc) that is not going nowhere...any ideas?? is it possible that this wire should be connected to any speed sensor?
I ordered the unit directly from Japan and since I live in Greece nobody heres knows either japanish or how to tune the unit... (
Thanks in advance

skotx

Pretty much everyone in this forum has the Power FC installed in an FD, so I don't think you'll get much help from us.

The wiring diagram in the service manual will help you find out what those extra wires do. I got my manuals from www.iluvmyrx7.com but that site seems to be down. You might try it periodically to see if it comes back up.

I believe the speed sensor goes directly to the instrument panel, then from there on to the ECU.

vosko

iTrader: (4)

i have the exact same unit sitting on my desk. i assume the extra wire on the harness is for the 3bar map sensor. i don't know exactly. to my knowledge the TII tranny doesn't have a speed sensor that the PFC can read....... only the FD tranny has that! good luck

DyNaMiTe KiD

if u got it from japan wasnt it supposed to be plug n play?

Black7Conv

Dynamite kid it is plug n play, the unit is tuned for my motor and everything they sent to me was ok. I just dont know which the speed(in the commander) is not working.
Thanks guys for the replies.
Also I've got another problem. The air temp was -43 to -10 and I thought that air temp sensor was faulty. I replaced it and the problem continues. Was else should I look for?
Any ideas? the a/r ration is between 10 and 12.0. Is it bad for the engine now that this air temp problem exists?

Black7Conv

which=way

Black7Conv

Sorry guys I mean why! that air temp problem is very annoying and don't know what to do (

Black7Conv

vosko if it is for the 3bar map sensor, what should I do? I'll try to scan the photo that was in the japanish instructions. it is part of the engine diagram but it's not much help to me

Black7Conv

Sorry guys for all my questions but you are my only help. In the sensors check menu I found out that the fuel temp sensor was replaced with **** and the volts were stuck at 4.98 or so.
Do fc's have fuel temp sensor or is this an fd thing?
What should the proper air temp sensor voltage be?

Ranzo

I have a Power FC in my FC3S. My speed function works properly. I have one wire coming from the harness that is connected in behind the stereo, I am not sure of its funciton exactly.

If you could post pictures I could tell you where it is supposed to go.

I know it does not go to the MAP Sensor cuz the map sensor is spliced into the wires where the AFM used to be.

Black7Conv

Ranzo I've been told that this extra wire is used only if you want to change the map sensor to a bigger one,ie 3bar map sensor. Any ideas why my speed function is not working or the air temp sensor reading is incorrect? You just unplugged the ECU and plugged in the Power FC with no problems and all the readings were correct?
I believe you are my only hope cos here in Greece I am the only one with a Power FC unit in a FC3S.

Ranzo

Ok I need more information on this loose wire to fully understand what it is you are talking about. Mine has no extra or loose wires. There are two types of Power FC, one uses the Stock FC AFM and the other uses a Map Sensor. You will have to select the proper sensor via the commander.

As far as your fuel temp sensor mine has the same readings. i think the FC does not have a fuel temp sensor.

The air temp sensor, as far as I know will have to be replaced by a stock FD or Apex unit in order to get a reading.

rx7will

iTrader: (6)

The fc does not have a fule temp sensor. How does the pfc get a speed reading, the fc uses a spedo cable?

Black7Conv

Ranso the extra wire in the wiring harness is for the 3 bar map sensor. I've been told that today through an e-mail I received from Apexi. At the moment I am using the stock fc afm but maybe later I'll change that option... What should I choose? stock Fc afm or a 3 map sensor?
Also, today Apexi informed me that I had this incorrect air temp reading cos my Power FC needs j-spec air temp sensor in order to work and not greek ones because it was programmed for j-spec sensor. unbelievable!! At least now I know what the problem is and I only have to wait for the new sensor to arrive.
Ranzo and rx7will the FC3S doesn't have a fuel temp sensor and that's why we have that reading(4.98v) in the commander. I think only the FD and the Cosmo have a fuel temp sensor.
Rx7will I was just wondering the same cos my speed reading is not working, is there any trick for the reading to work?

whiterx7TII

hey..i know its alittle off topic, but where did you get your power fc for the fc3s and how much>

DaleClark

iTrader: (55)

The cruise control unit in the FC has a speed signal - that's what you tap into for rev-speed meters and the like. The speedometer takes the mechanical cable and converts it to a pulse signal for the cruise control box.

If you look at the hookup instructions for the Apexi Rev-Speed meter for the FC, you'll see the wire on the cruise control unit highlighted.

Dale

Black7Conv

whiterx7TII I knew someone that ordered it through Jun Auto Mechanic in Japan. Unfortunately I had to pay almost 2.500 Euros for the PFC+Commander+adaptor etc etc
dcfc3s thanks for the info. I'll try to sort the speed reading out.

George

IGY

I believe the one wire you are refering to is the speed sensor wire. On an FC you have to tap off of the back of the gauge cluster to get an electonic signal for speed. The map sensor harness plugs into the side of the Power FC on the version I have seen (It has its own 3 wire harness). It is possible that whoever installed your Power FC Ranzo just used the existing wires for the flow meter and tapped them into the map sensor wires on the computer.