02 sensor 4agze vs blcktop 20v

**TauhuTauhu** · 21-01-2006, 03:48 AM

can i use 4agze's 02 sensor for BT 20v?

i was told tht the engine will have odd behavior with 4agze's sensor...

but it doesnt sound so logic...
since most toyota 4 wires o2 sensors are the same...giving same signals/readings...

i only have 4agze's sensor now, hope it can b used on my engine.

how do i wire it up if it's going to work?
2 wires with same color are for heater? the other two are to ecu and grounding?

**oldcorollas** · 21-01-2006, 04:14 AM

yup, most 4 wire sensors are pretty much identical, except for maybe heater power.. but the response curve should be similar..

yup, sound slike you got it..
2 same colour wires are heater.

i think the black wire is usually for signal (not ground)..

what are the colours of the other two wires?

**TauhuTauhu** · 21-01-2006, 04:35 AM

2 black, 1 blue, 1 white....
which one to which one?

**oldcorollas** · 21-01-2006, 04:53 AM

black heater...

according to colins site
http://www.thegebharts.com/o2sens.html

blue is signal
white is ground.

**TauhuTauhu** · 21-01-2006, 12:50 PM

thanks alot!

**TauhuTauhu** · 25-01-2006, 03:38 AM

i'm not really sure how to connect the o2 sensor because i dont of the sockets and wires are cut...

the two black ones shud go to "HT", blue one goes to OX and white one goes to E1?

dun understand the ecu pin out diagram..hmmm

**oldcorollas** · 25-01-2006, 03:55 AM

doesn't sound toooo bad...
how does diagram show the original being connected? (i mean, your wire choice sounds fine, as long as that is how they went on original engine)

**TauhuTauhu** · 25-01-2006, 04:12 AM

here's the diagram on gze

Blacktop 20v's

**TauhuTauhu** · 25-01-2006, 04:16 AM

i think i know how now....

black one to HT and B

blue to OX and white to ground

is tht correct?

**oldcorollas** · 25-01-2006, 05:07 AM

Originally Posted by TauhuTauhu

i think i know how now....

black one to HT and B

blue to OX and white to ground

is tht correct?

blue and white are ok,

one black to HT (and we are assuming that this is grounded by ECU), however, you want your heater power to also be switched.. like ignition power, or fuel pump power or similar, so that the actual power source is switched off.... perhaps

it's just another safety measure i guess...
thats how i would set it up, but if you are confident that HT will never ground when car or turned of, then it will be fine...

**TauhuTauhu** · 25-01-2006, 04:33 PM

i think the heater doesnt work all the time...

it shud be working according to coolent temp and also engine load...

so i THINK, there shud b a relay in HT tht switches according to engine load and coolent temp and oso engine on-off.. (not sure though)

anyway, i will try it out.

thx !

**-GT-** · 25-01-2006, 05:33 PM

Only difference i know of is heater resistance; gze/silvertop is ~7 ohms, blacktop is ~14.

Everything else will be fine.

**TauhuTauhu** · 25-01-2006, 09:02 PM

the resistance is different???

tht means it's not going to work properly rite?

because from wat i know, the ecu also take account of the heater resistance. higher exhaust temp = greater resistance and vice versa.

and is tht going to burn the ecu?

**oldcorollas** · 25-01-2006, 09:06 PM

i think the ECU would only be grounding the current from the heater via a transistor.. same as it does with the injectors (although injectors could be PW signal)
it's unlikely that the ECU would vary resistance (= ECU having similar heater inside it to the sensor!!)

sensors are fairly happy to run all the time anyway, and most car driving it is used for cruise adjustment anyways...
GZE is 2amp draw, perhaps to keep it cleaner fromt he rich mixture? or perhaps just different design... it's unlikely the ECU would object to the extra current draw of the sensor, but if you are worried, just wire it up to an IGN switche dpower, and ground, and let the key or fuel pump power turn it on..

or will it affect longevity that much? (i am not sure)