1uzfe uzs131 cold start wiring diagram

[j_tomo]

hey all
just trying to fire up the 1uz
it runs when fuel is tipped into the intake, for few rpms

so i thought it was gummed injectors, ive cleaned them out and there working fine (cold start too)

now im stuck
loom has had the traction control and trans wires removed
with every other toyota ive wired up ive ran the cold start injector straight off the startor signal wire with a thermo switch conected in parallele so it doesnt fire once warm

now from what ive read it runs on the cold start before the injectors kick in
i can manualy opperate the cold start by putting batt+ to the black/white wire for a few sec's then it doesnt work
its linked to a brown thermo sensor located by the r/h distributor, when i test the sensor cold it has contunuity between both pins and each pin to body (earth) once warm there is no circuit anywhere

theres a sta pin on the ecu but it has no current coming out of it
ive got all the lextreeme diagrams and there no good
how do i wire it up?
thanks
jeremy

[BIG_BOY]

simply dont use it you dont need it & they are known for getting moister in the sensors & staying on causing all sorts of over fueling problems

i have 3 car out of mine were it is disconnected because it played up & none of them ever have any trouble starting evan in dunedin winters

other wise if you really want it i have a wiring set up not using the computers in a tec book i can put up for ya

[vvega]

simply dont use it you dont need it & they are known for getting moister in the sensors & staying on causing all sorts of over fueling problems

i have 3 car out of mine were it is disconnected because it played up & none of them ever have any trouble starting evan in dunedin winters

other wise if you really want it i have a wiring set up not using the computers in a tec book i can put up for ya

never head that before

the sta pin should only have 12v on it when your cranking .. if it dosent. ..then your cold start wont work at all

did you get the injectors untrasonicsed ? ... if not there probably still gummed up

[BIG_BOY]

it was more common on the old MA61 & MA70 supras & some early AW11 MR2`s but happened a bit still in the later years they would power up once & then when power was droped they dont quite shut so the still dribble fuel the best bit was they did this to the pressure droped witch was about 10 min after you turned it off so you then had a dry line witch made it a basted to start the next time

you never need it any way

as for the sta terminal like sed has power for a couple of seconds on the later computer controlled or just while the key is on crank on the early ones

[j_tomo]

from what ive read on lextreem the early crowns do need them, they fire on the cold start then switch to normal
the diagrams ive looked at the sta pin on ecu only controls feul pump relay

its definatly not overfueling, if i tip fuel into the intake it fires up

i soaked the injectors in brake clean over the weekend, tapped the bigger bits out of the injector gauze, hooked a battery up to each and blew compressed air through them
then installed them into the inlet manifold ran pressurized fuel to the injector rails and opperated each to check spray pattern and to see if they were leaking

so that sta pin should go to the cold start injector (black/white stripe) instead of me hooking it up to the startor signal wire???

thanks
jeremy

[BIG_BOY]

from what ive read on lextreem the early crowns do need them, they fire on the cold start then switch to normal
the diagrams ive looked at the sta pin on ecu only controls feul pump relay

rong they run the main injectors on crank on all motors after 1976 there was one were they did have it like that it was the 1st EFI they sold to the market not quite how it worked but it was the 1st done by jet tronics & its out of the concept of were you are wasent on the crowns & never made it to new zealand

the diagrams ive looked at the sta pin on ecu only controls feul pump relay

na controls a couple more things than just that depends on what year were talking about as to what it douse

its definatly not overfueling, if i tip fuel into the intake it fires up

have you checked wiring from ecu to injectors & AFM or MAP sensors

injectors sound like you should have them all good & clean then

as a note a few questions about you motor
what are
-full engin code
-the year of make
-the version of motor (if ya know there's offen 2 or 3 of the same motor just improvements in eletrics)
-auto or manual ECU
-do you have the ECU model or code or markings?

just so i can look up your wiring more at work tomorrow & see your exact wiring

[j_tomo]

hey there

its a 1uz-fe
late 80's early 90's toyota crown uzs131
its a 1st gen (cold start injector type)

manual gearbox (was originaly auto)

ecu numbers
toyota 98661-30432
17000-4100 12v
26-16-22 pin config

its a toyota type not a lexus, the toyotas run a seperate trans computer
ill post the diagrams i have tonite

should the sta ecu pin be conected to the starter signal wire and the cold start? the wires are the same colour

at the moment im maunualy cranking the cold start as its hooked up to the starter signal so maybe the computer doesnt realise its meant to be doing something

anyway time to replace the variator on my scooter
jeremy

[j_tomo]

http://www.lextreme.com/forums/showthread.php?t=1004&page=2&highlight=uzs131
under lambos post
how do i hook up the sta pin on the ecu is it just +12 from the starter signal wire and then does the ecu do the rest??

im just paraniod about letting the smoke outa my ecu lol
thanks
jeremy

[BIG_BOY]

at the moment im maunualy cranking the cold start as its hooked up to the starter signal so maybe the computer doesnt realise its meant to be doing something

by this do you mean you are not feeding the ECU any signal to say that its cranking?

[j_tomo]

that was the case
now ive hooked it up so it gets 12v when cranking
still no joy
tried reading diagnostic codes -check light stays on

on the 22 pin ecu plug ive got 4 12v power feeds and 1 sta and the check engine light
ecu and everythings grounded
it cranks up on the cold start injector for a few turns

[j_tomo]

all sorted
the diagrams off lextreem are correct but on the 22pin plugs they show the 2 and 4 larger pins in reverse sides of the plug
swaped em round and it cranked straight up, idled reved sound sweet