Offroad-Express

hi all got a problem with my 1uz into surf

details are:

92 toyota 1uz engine with auto 16p16p22p26p

1991 toyota surf 2lte auto 26p16p12p

1uz swap using 1uz auto into surf with 4wd box mounted on rear of the 1uz auto. is using 1uz 4 prong speedo sensor.

issues are:
1) engine idles fine but when revved wont go passed 2500rpm. it just bouces back to 1500rpm the back to 2500rpm softly. have hooked up speedo from cluster to 1uz ecu.
2) when i do rev from ilde till 2500rpm it does sound like its slightly missing on way through revs.
3) at the moment i cant get the 1uz auto to wire up with the surfs auto wires to allow the start signal or reverse lights to work. only way to get the starter to work is twisting the surfs lockout wires together but no safety feature then.

as far as i can tell all injectors are working and it is getting spark from both banks.

i have spent a total 2 days on these 3 issues and still no luck. it is starting to really annoy me now making me almost wanting to give up on it.

i have searched google for countless hours.

any help would be great guys.

cheers john

have a look or post a question on http://lextreme.com/

Are you running the factory airflow meter? maybe check the 2 plugs on the throttle body or could be some dirt etc on the inside. otherwise might be a dirty/faulty sensor?

hi.

yeah i have also posted up on that site.

yes running the factory afm. yes both plugs are clean. have been over all plugs

cheers john

Although it doesn't sound like it, there may be a fuel supply issue. Are you running the hogh pressure fuel pump for the 1 uz? Not sure what pressure they need, but my 304 needs 40 psi to crack the injector rail open.

rokhound wrote:Although it doesn't sound like it, there may be a fuel supply issue. Are you running the hogh pressure fuel pump for the 1 uz? Not sure what pressure they need, but my 304 needs 40 psi to crack the injector rail open.

hi grant. this john from eenergy.

yeah walbro 500hp external pump in diesel tank. tank has fully been flushed out and new lines. will try get hold of a gauge to make sure is running properly.

i was going to tgo for the holden v8 but the coil sas chewed up to much coin

also anyone recommend any shops in chch the have done 1uz auto conversions on any trucks? just in case i have to send it to a shop to sort out

cheers

hey jono

talk to rick from 4wd acc.

are all ya plugs plugged up rite like tps and ya knock sensor?
cam angle sensor not playing up?
checked the dizzy and all the leads which mayb causing miss.
sounds like ecu not letting it rev up, so something is causing it.

I'm no help sorry, but I do know we had a similar problem initially, and it was something wired incorrectly.

At the time, the guy who wired it didn't have enough time to work out how to get the LS400 ecu working without running an auto ecu, so we switched to a crown ecu - I don't know if that was the only cause, but maybe your problem is related to how your ecu talks to the auto ecu?

Sounds like you have it wired up wrong.. It's going into limp mode by the sounds....
Also check the ECU main plugs to make sure they seat properly.. I had about 4-6 pins loose and it was a mare to track down..(7-9 months)
Have you got a fuel pump ECU as well? makes it easier to wire and match with main ecu..? I think from memory they run low pressure till about 2/3 throttle position then WOT..
Also check for a good positive earth system..? My new truck ran like a POS until I had redone the earth side.. that was an easy fix.. but still took me over 2 weeks to find that..lol
Was the loom cut or uncut..? makes it easy to help with diag.. can you get the ECU to throw error codes? that way it makes it easier to fix..
I'll try to think or more..
Cheers

mud_slinger wrote:hey jono

talk to rick from 4wd acc.

are all ya plugs plugged up rite like tps and ya knock sensor?
cam angle sensor not playing up?
checked the dizzy and all the leads which mayb causing miss.
sounds like ecu not letting it rev up, so something is causing it.

hi mate.

yeah im slowly going through all the sensors etc. google brings up the this particular ecu model do cause problems but not much is said bout the fix that ive found so far.

cheers

jeremy wrote:I'm no help sorry, but I do know we had a similar problem initially, and it was something wired incorrectly.

At the time, the guy who wired it didn't have enough time to work out how to get the LS400 ecu working without running an auto ecu, so we switched to a crown ecu - I don't know if that was the only cause, but maybe your problem is related to how your ecu talks to the auto ecu?

the 1uz auto is controlled by the 1uz ecu. as stated above that the 92 ecu is a problem unit but hopefully someone has figured it out.

cheers

does the ecu have a part no? i've got one spare if you need it

Big wrote:Sounds like you have it wired up wrong.. It's going into limp mode by the sounds....
Also check the ECU main plugs to make sure they seat properly.. I had about 4-6 pins loose and it was a mare to track down..(7-9 months)
Have you got a fuel pump ECU as well? makes it easier to wire and match with main ecu..? I think from memory they run low pressure till about 2/3 throttle position then WOT..
Also check for a good positive earth system..? My new truck ran like a POS until I had redone the earth side.. that was an easy fix.. but still took me over 2 weeks to find that..lol
Was the loom cut or uncut..? makes it easy to help with diag.. can you get the ECU to throw error codes? that way it makes it easier to fix..
I'll try to think or more..
Cheers

hi.
i dont have fuel ecu. i just wired up walbro to ign so its getting full flow all the time. been through all the earths that i can find and so far they all are ok. the loom is an uncut loom. will look at the ecu pins and make sure they are tight. ecu throws up error code of 56 which i cant find on any charts at all??? double checked this 4 times.

cheers

Jerry wrote:does the ecu have a part no? i've got one spare if you need it

ill have to get the number and let u know(truck doesnt live with me ) but if it matches urs that would be awesome - atleast it would cancel that out.

cheers

jonossiksilvia wrote:

Big wrote:Sounds like you have it wired up wrong.. It's going into limp mode by the sounds....
Also check the ECU main plugs to make sure they seat properly.. I had about 4-6 pins loose and it was a mare to track down..(7-9 months)
Have you got a fuel pump ECU as well? makes it easier to wire and match with main ecu..? I think from memory they run low pressure till about 2/3 throttle position then WOT..
Also check for a good positive earth system..? My new truck ran like a POS until I had redone the earth side.. that was an easy fix.. but still took me over 2 weeks to find that..lol
Was the loom cut or uncut..? makes it easy to help with diag.. can you get the ECU to throw error codes? that way it makes it easier to fix..
I'll try to think or more..
Cheers

hi.
i dont have fuel ecu. i just wired up walbro to ign so its getting full flow all the time. been through all the earths that i can find and so far they all are ok. the loom is an uncut loom. will look at the ecu pins and make sure they are tight. ecu throws up error code of 56 which i cant find on any charts at all??? double checked this 4 times.

cheers

Would love to try to help you.. BUT some dude popped round a couple weeks ago and "borrowed" my lex folder and I don't know the dude at all and don't know where he works or lives..LOL But hey it's a small place.. reakon i'll see him sometime..lol

56 is fuel pump problem, abs,trac , just logged into lextreme and searched it..
ALSO FYI.. you should not have the fuel pump wired to the ign.. at least to a relay that has a minimum of 30 amps.. but you should get a rev censositive relay as when motor stops, stalls it kills the pump and stops fuel from pumping all over the place in a roll over or the likes..

Big wrote:56 is fuel pump problem, abs,trac , just logged into lextreme and searched it..
ALSO FYI.. you should not have the fuel pump wired to the ign.. at least to a relay that has a minimum of 30 amps.. but you should get a rev censositive relay as when motor stops, stalls it kills the pump and stops fuel from pumping all over the place in a roll over or the likes..

bugger bout your folder.

fuel pump is hooked up using a 30amp relay,

will keep that i mind for a fuel shutoff one.

do u have a link to that page u just found? dont think it came up when i searched

cheers

I have done a bit of a Google search and it seems to be a problem from time to time.
I believe there are some Ecu's out there which like to "see" all the engine components.
Otherwise they go into "limp mode"
Here is a comment from a web site I found.

The 90-92 LS400/SC400 ECUs seem to be a problem child for some reason – these have 4 x two-row grey plugs and I have had about a 30% success rate with them so far. They all start and idle ok, but for some reason many won’t rev beyond about 2800 RPM. I do not know hwy this is – it makes no difference whether the loom was cut or intact, whether the auto trans is there or not. I wonder if the missing traction control is part of the problem, but it doesn’t affect any other ECU.

Noting that this style of ECU was only used for ~2 years, I wonder if it is a design fault where they are prone to failure. Diagnostics has not been of any help either. Ironically reconfiguring the ECU pins to suit a Crown computer has resulted in a 100% success rate, without changing anything else.

kbushnz wrote:I have done a bit of a Google search and it seems to be a problem from time to time.
I believe there are some Ecu's out there which like to "see" all the engine components.
Otherwise they go into "limp mode"
Here is a comment from a web site I found.

The 90-92 LS400/SC400 ECUs seem to be a problem child for some reason – these have 4 x two-row grey plugs and I have had about a 30% success rate with them so far. They all start and idle ok, but for some reason many won’t rev beyond about 2800 RPM. I do not know hwy this is – it makes no difference whether the loom was cut or intact, whether the auto trans is there or not. I wonder if the missing traction control is part of the problem, but it doesn’t affect any other ECU.

Noting that this style of ECU was only used for ~2 years, I wonder if it is a design fault where they are prone to failure. Diagnostics has not been of any help either. Ironically reconfiguring the ECU pins to suit a Crown computer has resulted in a 100% success rate, without changing anything else.

yes i have seen the first paragraph of that article but i pretty sure i havent seen the part bout crown ecu. will look into this some more.

cheers john

the ecu i have is 89661-50171

http://www.toyodiy.com/parts/xref?s=896 ... J=on&mG=on

i've got the uncut loom as well , ECU is surplus as its being mated to an existing Link

Jerry wrote:the ecu i have is 89661-50171

http://www.toyodiy.com/parts/xref?s=896 ... J=on&mG=on

i've got the uncut loom as well , ECU is surplus as its being mated to an existing Link

will get hold of u once i find out which 1 mine is.

cheers

this is the ecu i have.

ditch the factory ecu, run a link ecu bitexpensive but well worth it in the long run

mud_slinger wrote:ditch the factory ecu, run a link ecu bitexpensive but well worth it in the long run

trouble is im running the 1uz auto box and i not sure the link will control the auto. yes if i can find an aftermarket ecu to run the auto i prob would jump for it

Jono This is the spare loom etc,

jonossiksilvia wrote:

mud_slinger wrote:ditch the factory ecu, run a link ecu bitexpensive but well worth it in the long run

trouble is im running the 1uz auto box and i not sure the link will control the auto. yes if i can find an aftermarket ecu to run the auto i prob would jump for it

megasquirt now does a computer to drive autos, also do computers to drive the motors as well, currently 1/2 way thru a lexus one at present,
http://www.lextreme.com/forums/showthread.php?t=8605 it has been done i think
cheers

Pedro

If its an A34x series auto you can use a jeep auto computer, its then independant of the engine ECU.

Have a chat with Rick @ 4wdacc, after him telling me what to look for on my 2JZ it was alot easier, tested each of the sensors etc using the factory recommendations. Do you have the factory manual for the 1UZ? If so it would be worth going through the various sensors to check their outputs/inputs.

wjw wrote:If its an A34x series auto you can use a jeep auto computer, its then independant of the engine ECU.

Have a chat with Rick @ 4wdacc, after him telling me what to look for on my 2JZ it was alot easier, tested each of the sensors etc using the factory recommendations. Do you have the factory manual for the 1UZ? If so it would be worth going through the various sensors to check their outputs/inputs.

Hi thanks mate.
Yes it runs the a34 series box so will look in to the jeep side. Yes I have the factory manual and I was using it to wire the engine up. Have got most of the way through the sensors
Cheers for ya help john

Pedro wrote:

jonossiksilvia wrote:

mud_slinger wrote:ditch the factory ecu, run a link ecu bitexpensive but well worth it in the long run

trouble is im running the 1uz auto box and i not sure the link will control the auto. yes if i can find an aftermarket ecu to run the auto i prob would jump for it

megasquirt now does a computer to drive autos, also do computers to drive the motors as well, currently 1/2 way thru a lexus one at present,
http://www.lextreme.com/forums/showthread.php?t=8605 it has been done i think
cheers

Pedro

Hi
Will look into it some more but not to keen at this stage having to build the ecu and then having to self tune as well but the cheaper cost is atractive though.
Cheers john

Hi jerry

Give me a week and if still haveing issues will get hold of you. If ya sell it to someone else well the old saying first in first served.
Cheers john