Problem i cant get to the bottom off.. collective thinking needed lol

[Texx]

To give you some I idea of what the resistance of the IAT sensor itself should be here's a page from the MR2 (5SFE) BGB. The sensor is the same as a N/A Starlet, but I can't see there being too much of the difference between IAT readings for both N/A and turbo.

 

[HYBRID]

Thanks Texx!! will have a closer look & report back!

kon

 

[HYBRID]

Ok so, i was having a look at a complete 4efte wireing diagram (HUGE THANKS TO THE LEGEND WHICH IS JAY!!)( by some miracle iv noticed that the 4 earths the ecu takes ie e1 & e2, e01 & e02 are all grounded to the body.. via something toyota call the "intake earth" .. now im trying to make sense of it & basically i think what theyre saying is they get it from some point in the body.. even though i cant bloody find the point..

if i can find the earthing point i can see if maybe i can remake a new earthing to the ecu for the 4 points.. as it could be they have seen better days.. when i hook up the multimeter to e1 & tha or any other sensor i get a constant ZERO reading.. im not sure what earth block e1 is used for but as texx said well its the ecu earth.. so safe enough to say any point would be a good earth to add i guess.. after all there is no voltage to it.. (i hope lol )..

so any ideas lads? have u ever found where the ecu gets the earths from? ie the connectoion to the body?

many thanks!
kon

 

[Texx]

I'm guessing the 'intake earth' relates to what I would call a 'junction connector'. Basically a point in the wire harness were a number of wires join and become one wire.
E2 is the sensor ground. Its earthed through the ECU, so if you have the ECU connectors disconnected you wont get any continuity to earth on this wire.

Have you checked behind the kick panels for any grounding points?

IIRC E1 should be a brown wire if that helps.

 

[Chris@CCM]

u sure the intake earths are on the 2 earths on the intlet manifold at the ic valve sounds silly but i would check them

 

[HYBRID]

u sure the intake earths are on the 2 earths on the intlet manifold at the ic valve sounds silly but i would check them

at this point nothing is silly chris lol... its a joke from beginning to end.. its doing my fucking head in :haha:

iv checked them already, they are the injector earths & all give continuity.. thanks all the same buddy

kon

 

[HYBRID]

I'm guessing the 'intake earth' relates to what I would call a 'junction connector'. Basically a point in the wire harness were a number of wires join and become one wire.
E2 is the sensor ground. Its earthed through the ECU, so if you have the ECU connectors disconnected you wont get any continuity to earth on this wire.

Have you checked behind the kick panels for any grounding points?

IIRC E1 should be a brown wire if that helps.

yeah i thought the same bud.. from what iv managed to gather there is an orange & white clip at the very back of the pass footwell.. which has lots of brown wires in it.. ie all earths.. thing is i cant see where they are bloody going as theyre behind the damn aircon unit & im still contemplating what to do, i think ill create my own earthing point & connect (splice) 4 new wires to the main harness.. if that doesnt do the trick.. im going to bury myself alive in this mystery lol :haha:

& yep ur correct it is a brown wire

many thanks!
kon

 

[HYBRID]

Seems like shit is being thrown at me with many shovels now not just a fucking flick at a time...

Right, iv borrowed an ecu (many thanks to Charlie aka Crazy Glanza) it was working fine till after 150kms.. everything was spot on.. then as soon as the ecu started to adjust to what it was reading from the sensors its all gone to shit again same fucking results i was getting with the other oem ecu i have im going fucking bonkers.. so now the ecu is ruled out as well.. i really dont know which stone to turn over next.. each day its seeming more likely that im going to have to make a new harness for the whole engine or buy a new one from toyota..

i really need to know where the earth mounting points are on the body for the ecu.. i cant find where they go to & iv dismantled most of the dash lol.. im going fucking bananas lol :homer:

my car needs an exorcism .. or worse lol :shoot: :haha:

any ideas feel free to lob them at me lads!
kon

 

[Chris@CCM]

Seems like shit is being thrown at me with many shovels now not just a fucking flick at a time...

Right, iv borrowed an ecu (many thanks to Charlie aka Crazy Glanza) it was working fine till after 150kms.. everything was spot on.. then as soon as the ecu started to adjust to what it was reading from the sensors its all gone to shit again same fucking results i was getting with the other oem ecu i have im going fucking bonkers.. so now the ecu is ruled out as well.. i really dont know which stone to turn over next.. each day its seeming more likely that im going to have to make a new harness for the whole engine or buy a new one from toyota..

i really need to know where the earth mounting points are on the body for the ecu.. i cant find where they go to & iv dismantled most of the dash lol.. im going fucking bananas lol :homer:

my car needs an exorcism .. or worse lol :shoot: :haha:

any ideas feel free to lob them at me lads!
kon

y not just make a new earth for the ecu mate ?

 

[Sheldon]

Seems like shit is being thrown at me with many shovels now not just a fucking flick at a time...

Right, iv borrowed an ecu (many thanks to Charlie aka Crazy Glanza) it was working fine till after 150kms.. everything was spot on.. then as soon as the ecu started to adjust to what it was reading from the sensors its all gone to shit again same fucking results i was getting with the other oem ecu i have im going fucking bonkers.. so now the ecu is ruled out as well.. i really dont know which stone to turn over next.. each day its seeming more likely that im going to have to make a new harness for the whole engine or buy a new one from toyota..

i really need to know where the earth mounting points are on the body for the ecu.. i cant find where they go to & iv dismantled most of the dash lol.. im going fucking bananas lol :homer:

my car needs an exorcism .. or worse lol :shoot: :haha:

any ideas feel free to lob them at me lads!
kon

so if i can understand correctly... after the ecu starts to sort of "work" on sensors readings it will start fucking things up? so its a sensor somewhere that its not working properly but not being seen as not working properly by the ECU and not showing any error codes?:|

 

[Texx]

y not just make a new earth for the ecu mate ?

Indeed, that's probably the easiest way to rule out a poor ECU earth.

Just splice a decent size piece of cable into E1 at the back of the ECU connector and bolt it to the body somewhere.

 

[HYBRID]

will do guys, shall i earth e2 as well? i think thats the simplest thing to do lol..

will report back as soon as iv got some results!

kon

 

[silverGtstu.]

hi,

i believe i suffered from the same problem, e.g., i would start my car would be fine once warm and the ecu was using the 02 sensor data, the car would idle bit erratic and run extremely lean until i held the throttle down slightly to bring up the egt, then would run fine as the 02 sensor would start switching properly again from rich to lean, my car was checked by 10 specialists and eventually was told to run a 3wire 02 sensor with heater circuits, and i did and it cured the car,even after trying 4 other 1 wire 02 sensors made no difference but the 3 wire cured it!

 

[Sheldon]

i believe i suffered from the same problem, e.g., i would start my car would be fine once warm and the ecu was using the 02 sensor data, the car would idle bit erratic and run extremely lean until i held the throttle down slightly to bring up the egt, then would run fine as the 02 sensor would start switching properly again from rich to lean, my car was checked by 10 specialists and eventually was told to run a 3wire 02 sensor with heater circuits, and i did and it cured the car,even after trying 4 other 1 wire 02 sensors made no difference but the 3 wire cured it!

whats the difference in the 3 wire ones?

 

[silverGtstu.]

hi

the three wire ones run a heater circuit, and as the sensor is a comparison of oxygen sensor, it operates more effectively when hot. most cars use heater circuits some are timed mine is continuis.

 

[HYBRID]

Hi mate, thats very interesting..

did anybody tell you why this was happening though? what you are saying is very similar to the problems im facing.. how did you connect the lambda? what lambda did you use? as we only have a single wire one, so im assuming the other wires are all earth & you connected them elsewhere..

any info would be greatly appreciated!
rep added!
kon

 

[Texx]

will do guys, shall i earth e2 as well? i think thats the simplest thing to do lol..

will report back as soon as iv got some results!

kon

I wouldn't earth E2. Think of E2 and the sensor reference feed as the 2 probes of multimeter. You could introduce more problems by earthing E2 than you would cure.

As long as E1 has a good earth E2 should be fine, unless the ECU has an abnormal internal high resistance.

 

[HYBRID]

Thanks Texx! will make sure to earth e1 only then

Many thanks for all your help.

Btw whilst were on it, i have gotten a 4wire lambda as well (just in case) it has 2 black wires (im assuming earths) & a blue & white wire.. its of an NA 4efe.. any ideas as to which is power & which is signal?

thanks
kon

 

[Texx]

This might be of some use:

 

[HYBRID]

thanks buddy!! so if im getting it right white is signal so blue must be + .. good its as i was thinking lol.. rep added texx!