dazed01

There are two green connectors up by the water thermoswitch, one goes to the thermoswitch anybody know where the other one goes? I can't find anything else to plug it into. There are no codes

FD3S4Life

iTrader: (51)

the 2nd one goes to the fuel temp connector located in the center of the secondary fuel rail. Someone correct me if I'm wrong.

Banzai-Racing

iTrader: (11)

That is correct and people have been know to get them switched around causing the problems as the ECU never thinks the coolent is at operating temp.

Rx7aholic

iTrader: (22)

The one that goes fuel is longer line than the water coolant if ur harness line up coorect then every connector should match it's exact location. Also make sure u have the right connector for Crank Angle Sensor, one is white and other I believe it's gray.
Khris

dazed01

The fuel and water temp sensors are hooked up.

RotaryEvolution

iTrader: (30)

a third? maybe a friend is playing a trick on you because there should only be 2 green connectors in that area. post a pic if you want any real confirmation.. i don't see how there could be another unless you installed the wrong sensor into the water pump housing or upper fuel rail. both the water thermosensor and fuel rail temp sensors use the same green connector style pigtails.

grimple1

iTrader: (1)

fuel and thermoswitch are the only green plugs on the engine harness.

RotaryEvolution

iTrader: (30)

which is why im curious what he has plugged into either the water thermosensor location or the fuel temp. there is also the plug for the solenoid in the rats nest but i don't see how you could confuse that with the others that are plugged in all in a row(there should be no missing solenoids).

empirebmx11

say you had an aftermarket secondary fuel rail, would there be a fuel temp conector in it? What would happen if the fuel temp connector was hooked up into the water thermswitch connector?

Mahjik

iTrader: (1)

There are some secondary fuel rails which retain the fuel thermosensor. If you have an aftermarket ECU, you can eliminate it however some still find it useful.

If you switch the two, the car runs like it's in limp mode with the stock ECU.

ttmott

iTrader: (1)

The PFC will turn on the fuel speed relay to up the fuel flow rate for vapor lock prevention based upon the fuel temperature.

If they were reversed the PFC would not track the engine coolant temperature and would stay in cold start condition all of the time. So check the temperature tracking with your gauges (hopefully you have an aftermarket temp. gauge).

Lastly, check the wire colors with reference to the wiring diag's to make sure they are to the right temp sensor.

grimple1

iTrader: (1)

Fuel Thermosensor is : Brown/Black & Brown/Yellow

dazed01

It appears to be the egr switch on that harness. It looks green but is lighter than the other two. The wires are brown and black and black and green.

grimple1

iTrader: (1)

yah the EGR is a blue connector and is Brown/Black and Blue/Green. I find trying to figure out the wire colors the hardest b/c they really discolor pretty far back into the harness. If you want to double check it you'll probably have to strip the plastic off a good ways back in the loom.

rspecfd

iTrader: (13)

sup grimple1, the king of the fd wire diagram. nice single turbo wire diagram thread.

ttmott

iTrader: (1)

Let's see
The brown / Black is the common reference ground for several sensors.
Both the fuel and water temperature sensors have the Brown / Black.

The Water temp sensor's second wire is Green / White
The Fuel temp sensor's second wire is Brown / Yellow

So if there is a green wire in a green connector attached to the water neck you're OK.

I didn't know that the two green connectors are keyed the same...

Mahjik

iTrader: (1)

It's also the exact same sensor for both locations. Just different uses.

dazed01

I appreciate the help and especially the picture of the harness that was great. So thatconnector is only on ca emissions cars? By vin mine is federal hmm