is there any way we can get the voltage difference on the digi fuel sender unit and try and make a circut to work it by using the analoge one?
What we need to do is find out what the testing procedure is for the digital sender unit. We know that the analog sender produces a resistance Empty is 4 ohms Full is 110 ohms. We need to find the above page from an 86-87 manual and hope that it has a test for the digital sender unit. If we look at the diagram for the digital guage heres my best guess. A14 is going to be the signal that is read by the guage and based on some assumptions I'm going to make will be a voltage from 0-12 volts A20 & A19 are going to be 12 volts and ground. This is where I make my assumptions. Its a pretty safe guess since the overall car runs on 12 volts but in the digital world 3.3 and 5 volts are also popular numbers and unlike the Analog sender which is grounded to the chassis the digital sender is isolated to the digital displays circuit board so A20 & A19 could just as easilly be 3.3 volts and ground or could be 12 & 7 volts or 5 volts and ground their are alot of possibilities. If you want to do a test Send 12 volts to A2 & A13 Ground A9 & A11 Use a voltage meter and measure A19 & A20
the fuel sender does not work without it grounded to the chassis. there are 4 pins to the fuel sender, 3 of them go to A14/A19/A20, 1 of them go to ground. Without ground, fuel gauge just shows full tank no matter what level your tank is. if you put A14 as 12v and 12v to one of A19/A20, this will be a short. 12v can only be applied to one of either A14 or A19/20 since according to the diagram, "A14 measures how much in resistance from A19 or A20"
One problem that the digital guage clusters have is that they are pretty much impossible to read when the sun is shining on them. I thought since mine was converted and didn't have the proper dimmer switch that was the problem but I have heard from people that had it as the original factory option that they can't read theirs in dirrect sunlight either. So I went searching for some brighter lights. This is the stock incandecent lightbulb and this is what I found to replace it with wow.... better use sunglasses with these the old and the new, the new is a 12 led T10 bulb originally the bulb did come as a T10 base but its to tall to fit in the guage cluster so I thought oh crap now I have some extra bulbs where can I use them now but upon closer inspection the leds are not glued into the T10 socket all thats holding them in place is a couple of bent wires so I pulled out the leds bent the 2 leads over and stuck the whole thing into one of the digital clusters T10 bulb holders then I wraped each of the leds wires under & around the bulb holders electrical contacts and then tucked the rest of the wire out of the way and the result.....as a bonus I got rid of that god aweful puky green color :barf Toyota sticks in all their vehicles All I did was change the bulbs so I don't have any explanation for the color change but me like :drool5 . And even in direct sunlight I can easilly read the numbers, unfortunately that puky green is starting to creep back in but thats life found out its the digital cluster wiring thats fucking my oil pressure guage so I'll be cutting a wire somewhere today Yay a nice blury picture but the Digital Clusters RPM's are way off. At 120kph I should be doing about 3000 rpm according to my analog cluster. The digital cluster says I'm idling at around 1050rpm and with the analog cluster I had it set at around 700rpm.
also, how did you do your wiring, i'm having a hell of a time doing mine and fitting all of the wires behind the cluster..
http://cgi.ebay.ca/ws/eBayISAPI.dll?Vie ... 1439.l2649 The dash harness comes up to the left of the cluster behind the drivers side window vent and theres a bit of space there so I try and stuff as much of the extra wiring as posible in there. I have it set up with the 3 digital cluster plugs and the 3 analog cluster plugs so I can swap analog/digital anytime I want but it does eat up alot of space
The 3 plugs with green tape are for an analog cluster and the 3 uncovered plugs are for the digital cluster
oh my. looks like i have to go into the car and get those wires mixed into the harness. what i just did was have my cut harness's wires plugged directly into the analog plugs...
I found a digital cluster at the junkyard and only took that itself, plus cut the plugs. was there something else i needed to make it work for my celica? my brother said something like i needed a module or something to make it work. I was thinking i would just have to rewire everything and it would be okay...
your brother is wrong, i literally just plugged the digital harness pigtails into the right pins from the analogue harness and it works for all except oil light and fuel level. for the fuel level you need to also get the digital fuel sender from the donor car! as for oil light, i'm not sure how to make that work yet
really?? re-pin to the digi plugs??\ got pics for colour references? I have external oil gauge so that doesn't bother me
lol, been on this board so long to forget first pages allready well, think I'm going to give it a try soon. Would you reckon that taking out the fuel gage and re-locating that somewhere else with the oem wires lengthened work? That would be an easy fix for temporary use.
it should work. iirc it's 3 pins, 12v, fuel signal, and ground. but then again, it's better to check the wiring diagram on this thread