EM1 secondary o2 sensor wiring
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Honda-Tech Member
Joined: May 2010
Posts: 102
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From: Jersey Shore
EM1 secondary o2 sensor wiring
Just bought a theft recovery 2000 si and it's missing some of the oem dash harness. I was able to get rid of all the check engine lights but the secondary o2 sensor heater circuit. I already tried multiple attempts at hard wiring directly to the ecu with no solution. I've tried all the threads with the how too's and none of them work the sensor won't even heat up. I know the sensor is good and the heater circuit works. Can any one shead some light on what they have done.
Old Fart
Joined: May 2004
Posts: 26,173
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From: kelowna, bc, canada
Re: EM1 secondary o2 sensor wiring
http://ww2.justanswer.com/uploads/dj...01_o2_0000.jpg
Do you have 12V+ on the black/yellow when ign. is on? 94
Do you have 12V+ on the black/yellow when ign. is on? 94
Last edited by fcm; Oct 14, 2016 at 10:04 AM. Reason: typo
Old Fart
Joined: May 2004
Posts: 26,173
Likes: 18
From: kelowna, bc, canada
Re: EM1 secondary o2 sensor wiring
Is it A8,,, http://ww2.justanswer.com/uploads/js...1_83274759.gif ?94
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Thread Starter
Honda-Tech Member
Joined: May 2010
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From: Jersey Shore
Re: EM1 secondary o2 sensor wiring
Honda-Tech Member
Joined: Jun 2018
Posts: 63
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From: Tucson
Re: EM1 secondary o2 sensor wiring
Yeah, I wired it up using ffsquad, and theoretically it all makes sense BUT just like the post above: no heat on the sensor and the cel is on. Different trim levels obviously have different harnesses, the only reason I can see it not working is that the pin/harness instructions are for an ex? Or if there is some minute difference between the 99 and 00 em1?
and yes I was very careful and double/triple checked everything.
I did>>>>>>
white wire - a23
green- c18
black -a8
black - b1
and yes I was very careful and double/triple checked everything.
I did>>>>>>
white wire - a23
green- c18
black -a8
black - b1
Fish Twig
Joined: Nov 2005
Posts: 15,554
Likes: 309
From: Still hunting that foo up there
Re: EM1 secondary o2 sensor wiring
If you have an ex or si and your missing the 2nd o2 sensor plug by the firewall it's just 10 bucks from Honda online. It plugs into the main cabin harness
Honda-Tech Member
Joined: Jun 2018
Posts: 63
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From: Tucson
Re: EM1 secondary o2 sensor wiring
hmmm... But would that work on a dx cabin harness? Since on the dx the engine harness takes care of both sensors. There in lies the problem. I could switch the cabin ecu from an em1 but then just have even more customizations.
Fish Twig
Joined: Nov 2005
Posts: 15,554
Likes: 309
From: Still hunting that foo up there
Re: EM1 secondary o2 sensor wiring
no it doesn't have the rectangle plug like the ex and si models. Yes I confirm it
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