How do you wire a Heated O2 sensor?
Thread Starter
Melting Slicks
Joined: Feb 2002
Posts: 2,699
Likes: 2
From: The Black Hole LA
How do you wire a Heated O2 sensor?
How do you wire a heated O2 sensor. I know 1 wire is for the existing O2 wire, 1 is for ground, and 1 is for power when the key is on. I bought a Bosch sensor with 1 black wire and 2 white wires and no wiring diagram. My question is which wires are which?
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
See my post in this thread
Do I need a heated O2 sensor?
to cut into the harness. There is a nice existing ground up front
below the PS reservior.
.
Do I need a heated O2 sensor?
"The white wires are for the heater. There is no
polarity for these so it does not matter which way they
are connected - one goes to a good ground and the
other goes to a switched positive (on in the 'Run, test,
start' key positions. Good practice calls for adding a
5 amp fuse. The blue wire to the Aux Fan relay mounted
on the rear side of the driver's fender well might be
one possible source for switched 12 VDC - verify before
proceeding."
You could mod the Relay to add a pigtail to it so you don't needpolarity for these so it does not matter which way they
are connected - one goes to a good ground and the
other goes to a switched positive (on in the 'Run, test,
start' key positions. Good practice calls for adding a
5 amp fuse. The blue wire to the Aux Fan relay mounted
on the rear side of the driver's fender well might be
one possible source for switched 12 VDC - verify before
proceeding."
to cut into the harness. There is a nice existing ground up front
below the PS reservior.
.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Incidently, I think I wrote about soldering the provided butt connectors
after crimping in another post.
I can't find the reference, but I remember reading in the NTK catalog
or some instruction sheet NOT to solder on the wires leading out of the
sensor.
The reason given is that the sensor draws reference air or some such
through the gap between wire core and insulation. Heat from soldering
endangers the ability for flow though here. Or something like this ...
.
after crimping in another post.
I can't find the reference, but I remember reading in the NTK catalog
or some instruction sheet NOT to solder on the wires leading out of the
sensor.
The reason given is that the sensor draws reference air or some such
through the gap between wire core and insulation. Heat from soldering
endangers the ability for flow though here. Or something like this ...
.
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
Originally Posted by CFI-EFI
Black for the O2 signal and the two whites for the power.
RACE ON!!!
RACE ON!!!
When I did mine I put the ground to the one on the engine block. Nice and closeby.
Melting Slicks
Joined: Nov 2002
Posts: 2,471
Likes: 2
From: 1993 Quasar Blue 'vert Scottsdale AZ
Check out the new heated O2 sensors from Casper Electronics. The harness is already built and all you do it hook the ground and 12V switched. I just had EM order me two for $80 apiece.
Edit: I didn't notice what year you had. These are for GM's that weren't originally wired for heated sensors.
Edit: I didn't notice what year you had. These are for GM's that weren't originally wired for heated sensors.
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Drifting
Joined: May 2003
Posts: 1,730
Likes: 1
From: Charlotte NC
St. Jude Donor '05
Do yourself a favor and make sure your only doing AC delcos. I've had alot of problems with bosch in the past.
Everyone is right, the heater is just a resistance heater so power cna go either way with no harm.
Everyone is right, the heater is just a resistance heater so power cna go either way with no harm.
