Hi all,
Driver of the Angry Beamer Beating Beaver coming back at you with a interesting issues here.
been reading the crap out of the forums and am alittle confused coming to merging the upstream O2 sensors on my 03’ 5MT is300
I have the harness out right now and am wanting to splice the harness itself as when I took my exhaust off and scrapped the cats the b2s1 sensor was stripped and not coming off so I scrapped them with that.
when I went to scrap them I only got $20 as they were aftermarket cats
my issue is there are supposed to be 4 o2 sensors on the car. Mine only has 3. I’m thinking this has something to do with the aftermarket cats.
so anyways. I have the whole engine harness in my hand and i Have the plugs labeled but am confused.
What I thought was b2s1 is a different plug style then b1s1 and what ever my third plug would be? (I guess it would be b1s2 and b2s2 merged together) So b1s1 and b1s2 are the same plugs but b2s1 is different
Ill show pics below the give reference.
my question is what colour of the signal wire is in the harness for b1s1 and b2s1 and do I need to splice all 4 wires together or just the signals? I’ve read conflicting opinions about splicing only the signals or the heater wires as well.
I know the blue wire on the o2 sensor itself is supposed to be signal, which would make the Red and white striped wire on my harness the signal wire. But there is also a solid red wire as well as a brown(yellow looking) wire and the last one is another brown wire (pink looking)
the solid red wire and the brown/pink looking wire go into there own separate green shelled casing with a piece of bare wire in between it which tells me that one of those is probably signal because the stripped wire would be there to help fight interference.
on the second plug which I assume is b2s1 there is no hard shelling around any of the wires and the colours consist of solid brown, blue striped yellow, blue striped white, and pink striped blue.
on the last plug which I assume is the post Cat plugs or b1s2 and b2s2 splice together the plugs are solid black (with hard green shelling around it) black and red, light brown (but pink looking) and a darker brown.
for reference the signal wire on the o2 sensor itself goes to dark brown wire on the harness
I know this sounds so confusing but bare with me (wiring pun intended
)
And I’m saying the wire look like they are another colour because of the heat discolouration.
so which wires should I splice together?
Should I avoid this mess and just splice them together at the ECU side?
If so does someone have a pin out for that? I cannot find one anywhere. Any forum that I read on here that has one posted, the link is broken and takes me no where
im very confused and this is the last thing I need to do before I throw the motor in the car.
pics below for reference. If you made it this far in the post then you get a gold star!!!
