Mtdave2

I am putting an 1uzfe in my 92 toyota truck. I am also using the lexus dash. the swap post here.
http://www.yotatech.com/f161/1uzfe-s...rv-2wd-286903/

My question is with the fuel sender. two different set ups and im trying to figure out if there is any way to make this work!

lexus sender is the first photo, it has 3 wires

toyota the 2nd with two wire.

PureDrifter

iTrader: (10)

yeah just guessing but you'll probably have to swap to the Lexus fuel sender.

Yamae

Things are not very difficult if you don't want accurate readings.
See "F36 FUEL SENDER" in the left drawing and "F7 FUEL SENDER" in the right.

In the left, the terminal 3 "FV" stands for "Fuel, Voltage" and is the regulated DC supply. This is roughly equivalent to the "terminal 3" in the right.
The same things other 2.
The terminal 2 "FR" stands for "Fuel, Reading" and is the reading voltage. This is equivalent to the "terminal 2".
The terminal 1 "FE" stands for "Fuel, Earth" and is connected to the common ground line in the meter unit. This is equivalent to the "terminal 1".

In order to read the amount of the fuel in the tank roughly, following connections achieve it.
FV-3
FR-2
FE-1

If you want to read the accurate amount, you need to use an operational amplifier setting a bias and controlling a gain. This requires some skill to design a circuit though.

Without an operational amplifier, and you still want to have a better reading, additional resistors are needed in series with each lines depending on the MIN and Max adjustment. But when the scale is out of order, an external voltage regulator is needed.

Mtdave2

well I have the send out of the lexus, Im hoping the bolt holes match the toyota. I did connect the wires an everything is still working. The lexus is a side mount, the toyota is a top mounted sensor, but i think with a little bending i can make it work. now i have to drop the tank, and see if it will fit. might as well change the pump i guess while im in there.

Thanks for the input, sounds like this is the best option.

Mtdave2

I put 1uzfe and trans from a 95 ls400 donor car. I used the lexus dash in the Toyota. I have it running and almost all is well. The speedo is not working and I am trying to understand the circuit to make this thing work!

The speedo does not work nor does the trip meter (nor does the torque converter). So the whole system is dead. I used an uncut loom and the 2 wire speed seniors (two of them) are wired through a plug I didn’t have to touch. The only wiring I did was to connect the output from the engine ecu (spdm) to the dash wire for the speedo.

My question is how the ABS system and the wheel speed sensors play into this. I know they must and is probably why my speedo is not working. Though I have not seen any wiring diagram that really shows how this all works. Exactly which wire from the abs to the ecu sends info to which pin on the ecu, at what pulse rate?

Any help would be greatly appreciated

Mtdave2

Yeah, im stumped too. hard one isnt it.

Yamae

It's not hard for me.
I have a JDM wiring diagram. Everything is written in Japanese though.

The speed signal is sent as follows.
AT -> ECU -> Cluster.

The signals from the AT are named "SP2+" and "SP2-". These go to the ECU and are differential analogue signal at "pin9 and 4 of connector C" of the ECU.

The signal name from the ECU to the cluster is "SPDM" and is a digital signal. It is sent from "pin12 of connector V" of the ECU to "pin8 of connector B" of the cluster.

PureDrifter

iTrader: (10)

Please do not create multiple threads on the same topic. Your threads have been merged.

Mtdave2

So if I would have labeled the first one fuel sender issue, and the second speedo issue that would be ok? while they are both about issues on my swap, they are different topics. ??

Mtdave2

Yamae
I am with you, I do understand all you posted, and have it wired as such. no speedo working. That is why this is odd. many other have posted that problems with the abs has made their speedo stop working.

perhaps the abs gives power, or a ground to the speedo?

PureDrifter

iTrader: (10)

The second thread fell under "wiring questions RE LS cluster into truck", hence the merge.

Mtdave2

found the issue with the speedo. if anyone cares, there was interment connection in one of the wires going to the speed sensor. I ended up just running two new wires and I had an extra plug. wired it up and it worked! I had tested that circuit several times and it was always good. one more time because i had checked everything else, and I found the issue. what a pain!

Still working on the fuel gauge.