Oxygen (O2) sensors on 100 series

[physh]

Apparently my FZJ105R GXL (4.5 petrol 1FZ-FE) does not have any Oxygen (O2) sensors!

I thought O2 sensors were used to keep the mixtures good for emissions etc, so how is the 100 series 4.5 petrol emissions compliant if it doesn't have o2 sensors!??

How does the ECU manage to keep it all together, seeing as the 80 series 4.5 I6 had 2 of them, and the 4.7 V8 100 series also has 2... but the 100 series 4.5 I6 has nothing.


Can I add them?

If so, should one go before catalytic converter and one after?
How many wires should it have?
I can get 1,2,3,4, or 5 wire O2 sensors...
How can I hook them into the engine ECU?

Is the 100 series ECU different to the 80 series ECU?

[DamTriton]

Apparently my FZJ105R GXL (4.5 petrol 1FZ-FE) does not have any Oxygen (O2) sensors!

I thought O2 sensors were used to keep the mixtures good for emissions etc, so how is the 100 series 4.5 petrol emissions compliant if it doesn't have o2 sensors!??

How does the ECU manage to keep it all together, seeing as the 80 series 4.5 I6 had 2 of them, and the 4.7 V8 100 series also has 2... but the 100 series 4.5 I6 has nothing.


Can I add them?

If so, should one go before catalytic converter and one after?
How many wires should it have?
I can get 1,2,3,4, or 5 wire O2 sensors...
How can I hook them into the engine ECU?

Is the 100 series ECU different to the 80 series ECU?

Why in the hell would you want to ADD them??????? If it works as Toyota designed it to, and within all Australian emmissions regs, then don't try to "fix" it.

You would have to upgrade the to an ECU that supported the O2 sensors (in a hardware sense ie had the appropriate electronics to process information), upgrade the ECU program to accept and process that information, then interface the results back into the operation of the fuel system. Not to mention the ignition timing mapping for cold start/warm start/limp home modes, etc, then try to optimise all of the functions of the ECU so they work together properly. Yeah buddy, GO FOR IT!!!!!

..........or you can simply say "Thank you, Mr Toyota for doing all that work for me".

This "question" is straight out "ricer" BS...................Methinks you may be in the wrong forum...

[physh]

Damkia, thankyou for your comment, I appreciate what you're saying about the factory standard and Aus regulations.

...but mate, calling the "question" nothing but "ricer BS" is, in itself, completely BS.

I'm trying to find out information here, not trying to big-note myself and make people notice me.

So keep the agressive, non-pertinent comments regarding this topic to yourself.


And FYI - "having to upgrade the ECU" - I have both a UniChip and a Prins VSI LPG computer, both of which support being able to monitor lambda and automatically change the existing short term fuel trims directly.

So the reason I specifically ask, is because the UniChip and Prins VSI computer are designed to take an O2 sensor, in order to perform the short-term fuel trim calculations to maximise fuel economy and minimise emissions, how can I add one?

I just find it strange that the 100 series 4.5 does NOT have the O2 sensors, yet the 80 series 4.5 does, as does the 4.7 V8.


Does anyone else actually have any useful information to add?

[GQ4.8coilcab]

i think just a narrow band O2 sensor will do and probably is best to put it before the cat because maybe it might effect the levels of different gases and might give a wrong reading.If the 80 series has one, have look where it is placed? You might have to ring up the manufacturer of your computer or see on the computer what type they can take because like you said, there are so many wire types.
four wire
http://wolfems.cart.net.au/details/106323.html
one wire
http://wolfems.cart.net.au/details/106321.html

[physh]

i think just a narrow band O2 sensor will do and probably is best to put it before the cat because maybe it might effect the levels of different gases and might give a wrong reading.If the 80 series has one, have look where it is placed? You might have to ring up the manufacturer of your computer or see on the computer what type they can take because like you said, there are so many wire types.
four wire
http://wolfems.cart.net.au/details/106323.html
one wire
http://wolfems.cart.net.au/details/106321.html

Awesome, thanks mate.
Just looking over the wiring diagrams, my Prins LPG computer has two single wires for two O2 sensors - so for now I've got to go for a single-wire one.

The software allows me to use either wide or narrow band O2, but I don't know which will be better.

Gonna be trial and error I guess.

[Jimbo]

If it allows wide band then use that.

[tweak'e]

i think just a narrow band O2 sensor will do and probably is best to put it before the cat because maybe it might effect the levels of different gases and might give a wrong reading.If the 80 series has one, have look where it is placed? You might have to ring up the manufacturer of your computer or see on the computer what type they can take because like you said, there are so many wire types.
four wire
http://wolfems.cart.net.au/details/106323.html
one wire
http://wolfems.cart.net.au/details/106321.html

Awesome, thanks mate.
Just looking over the wiring diagrams, my Prins LPG computer has two single wires for two O2 sensors - so for now I've got to go for a single-wire one.

The software allows me to use either wide or narrow band O2, but I don't know which will be better.

Gonna be trial and error I guess.

i'm out of that side of things these days but years ago they where trying to avoid useing single wire ones. something about them having to wait till they warm up before they will read proberly. the multiwire ones had heaters or something built into them. i have no idea whats in these 4-5 wire ones..... $0.02

[Jimbo]

"i'm out of that side of things these days but years ago they where trying to avoid useing single wire ones. something about them having to wait till they warm up before they will read proberly. the multiwire ones had heaters or something built into them. i have no idea whats in these 4-5 wire ones..... $0.02"

Your right there. The single wire ones dont work untill they reach 300 degrees. Also narrow band are not very accurate compare with wide band

[physh]

Hmm.
I've got a couple of 1-wire universal O2 sensors, and a 4-wire universal O2 sensor - the 4-wire has a black, two white, and a grey wire.

Any ideas which would be which then?

[DamTriton]

Damkia, thankyou for your comment, I appreciate what you're saying about the factory standard and Aus regulations.

...but mate, calling the "question" nothing but "ricer BS" is, in itself, completely BS.

I'm trying to find out information here, not trying to big-note myself and make people notice me.

So keep the agressive, non-pertinent comments regarding this topic to yourself.


And FYI - "having to upgrade the ECU" - I have both a UniChip and a Prins VSI LPG computer, both of which support being able to monitor lambda and automatically change the existing short term fuel trims directly.

So the reason I specifically ask, is because the UniChip and Prins VSI computer are designed to take an O2 sensor, in order to perform the short-term fuel trim calculations to maximise fuel economy and minimise emissions, how can I add one?

I just find it strange that the 100 series 4.5 does NOT have the O2 sensors, yet the 80 series 4.5 does, as does the 4.7 V8.


Does anyone else actually have any useful information to add?

Had I known the full extent of your preparation and exactly what you were trying to achieve (adding a gas injection computer and substituting a universal computer for petrol) you would hve gotten a different approach from me. Apologies for the "agro", but if you read you original post with a bit of "distance" you will appreciate it was somewhat short on details in anything other that trying to stick some bits on for the sake of it...

Narrow band 3,4 or 5 wire heated O2 sensors would be the go. Avoid the unheated ones for reasons given above, and the fact they can foul up over time a lot quicker than the heated ones will. Bosch does a 4 wire generic type that seems to be reliable in service. They should be mounted as close to the engine as possible, ie close to the last junction of the ex-manifold before the cat, and as close as possible to the outlet of the cat.

By way of explanation, I'm a registered nurse - had a sh!t night at work. 2 patients died in a ward of 8 patients. Not exactly in a good frame of mind when I got home. Sincere apologies.

[physh]

By way of explanation, I'm a registered nurse - had a sh!t night at work. 2 patients died in a ward of 8 patients. Not exactly in a good frame of mind when I got home. Sincere apologies.

Mate I'm sorry to hear that - but no grudge on my part.
Apology instantly and completely accepted!

And... You're absolutely right - first post could been more descriptive... Sorry bout that!


I just got myself a 4-wire heated universal O2 sensor, going to look into how to hook it up to the Unichip first, because the LPG computer reads the signal from the Unichip...

OK I know, it's confusing... The Unichip interrupts the sig from the OEM ECU, translates it and passes it to the LPG computer... which then emulates the petrol injectors for the LPG injectors (+ a %age and various other changes).

I can now modify the fuel maps for petrol (and therefore LPG), but without an O2 sensor to feed back into the loop I can't change the short-term trim on either petrol or LPG...

You guys all confused? I am...