hedtrip

witch of the two black wires is the heater wire on the 02 sensor ? the one under the green . or under the white ?

JdmB16Eg6

bump for same answer

Relic1

it truly does not matter. the O2 heater is simply a resistor and polarity does not matter with resistors.

If you really need to know, I can look it up for you.

hedtrip

if u would be so kind

pdiggitydogg

Actually, it does matter.
If you wire it wrong (switch them up), you'll throw a cel.

As far as which is which...i used to do trial and error

Relic1

car harness side of the O2 connectors, looking into the connector on the open side. (ie plugs not wires)

AB
CD

A=grn/wht - grn - O2 gnd
B=white - white - O2 signal
C=orn/blk - black - heater neg control
D=yel/blk - black - heater pos
(wire colors are for an EG)

sicones

actually the 2 black wires on the 02 sensor are both heater wires and the polarity does NOT matter

this is straight from the denso instructions

black - heater
black - heater
white - signal
green - ground

/\ beat me to it

pdiggitydogg

Strange... Then what would cause the cel prior to switching them around?

Relic1

which CEL? 41 or 1?

pdiggitydogg

honestly, its been so long i dont even remember which it was

JdmB16Eg6

i throw out a low voltage code, dunno if its the o2 sensor or the heater wires

Relic1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pdiggitydogg &raquo;</TD></TR><TR><TD CLASS="quote">honestly, its been so long i dont even remember which it was</TD></TR></TABLE>
1 would make sense. 41 wouldn't. 1 is the O2 sensor portion which matters which wire is which, 41 is the heater which doesn't.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JdmB16Eg6 &raquo;</TD></TR><TR><TD CLASS="quote">i throw out a low voltage code, dunno if its the o2 sensor or the heater wires</TD></TR></TABLE>
Isn't low voltage an O2 signal code?

JdmB16Eg6

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">

Isn't low voltage an O2 signal code?</TD></TR></TABLE>
i dont know what it means

EE_Chris

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Relic1 &raquo;</TD></TR><TR><TD CLASS="quote">Isn't low voltage an O2 signal code?</TD></TR></TABLE>

It usually is.

Relic1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JdmB16Eg6 &raquo;</TD></TR><TR><TD CLASS="quote">
i dont know what it means
</TD></TR></TABLE>
the only O2 CEL I can find that includes "low voltage" is about the O2 signal not the heater. The O2 signal wires are polarity sensitive.

I'm back to my original statement... reversing the heater wires will not result in a CEL.

roadrunner1

i recently swapped a b16 sirII into my 92 hatch...have not wired in the 4 wire o2 yet but could i wire the black wires together and run the green and white where ever they are supposed to go?

roadrunner1

change that...where do the 4 wires run?

Relic1

the heater wires... one runs to the ECU the other runs to ignition power.
the O2 wires... white to the ECU green to ground.

roadrunner1

i just wired my o2 last nite and it is workin fine now...i wired one of the black wires to one the yellow/black wires into the empty plug on the strut tower...the other black wire to the orange/black wire on plug A on the strut tower pass. side...ran the white wire into the stock white one wire on the engine harness...and green to thermostat ground...and everything works great