I am looking a pin-out and diagram

[r55nls2002]

Hello all!

First time poster!
Anyways, I am looking for a fuel sender pin-out on a 2000 echo. I also need a wiring diagram for fuel gauge/ sender circuit. I have replaced the fuel sender with a new denso unit and have swapped the cluster and the gas gauge still does not work. It always reads a little under half tank no matter how much gas is in it. The only thing I can figure is that I need to go thought the wiring with my multi-meter.

Thanks ahead of time!
Randy-

Mods if this is not the correct sub-forum for this post, please move it.

[CTScott]

The fuel sender comes into the cluster via the violet wire in pin 18 of connector c14 (the larger of the two connectors). With the ignition off, you can measure the resistance on that wire relative to a ground point, as the sender is simply a variable resistor.

I am not sure about the 1st gen, but on the 2nd gen the resistance goes from 13.5 Ohms with a full tank to 414 Ohms with an empty one. Since that wire is the raw feed from the sensor, any jostling of the car should make the value fluctuate quite a bit. If you have someone else rock the car while you measure you should see it change. If it does not, then you likely have a bad or contaminated sender.

[r55nls2002]

Let me get this straight... The violet wire directly connects the sender to the cluster. OK, I honestly don't think it is the sender because the new unit is doing the same thing the old unit was doing. I think it is the wiring itself. All the wires coming from the sender look a bit sketchy. Hopefully it is the sender because I really don't want to run new wires thought out the car.

Thanks -

[CTScott]

Originally Posted by r55nls2002

Let me get this straight... The violet wire directly connects the sender to the cluster. OK, I honestly don't think it is the sender because the new unit is doing the same thing the old unit was doing. I think it is the wiring itself. All the wires coming from the sender look a bit sketchy. Hopefully it is the sender because I really don't want to run new wires thought out the car.

Thanks -

That is correct. There is one junction connector between the sender and the dash, but, if the wire was damaged you would more likely see the tank as empty, rather than half full.

[r55nls2002]

Thanks!