Where do I connect the O2 clamp 99 NB - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-09-2008, 03:41 AM   #1
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Default Where do I connect the O2 clamp 99 NB

Hey all,

I am finally installing my emanage and O2 clamp (getting rid of the HKS fcon mini). But I am unsure where on the factory ECU I should connect the O2 signal as the factory wiring diagram shows 3 heated oxygen sensors.

One "front" that connects into input 2C of the ECU
One "Rear" that connects into input 3J of the ECU
A second "Rear" that also shows as connecting into input 3J of the ECU

I'm trying to figure out which is which as I can only see one on the car. Any thoughts here? Maybe a couple are for intake air?

On that point my intake temp sensor is at the filter, I am thinking to move it to after the I/C, do you think that's worth while?

Lastly when they installed the HKS piggy back they cut the 2D connection on the ECU which goes to the dash lights (not sure where) and the Cruise control (which I don't have). Anyone know why it may have been disconnected? I guess I'll reconnect it anyway.

Thoughts please...
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Old 09-09-2008, 08:14 AM   #2
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"I think" I have found some answers, I'm assuming the connection 2C is the correct one as there are no wires going into the ECU for all the others. But I would still be happy if someone could confrim this to be correct.

The 2D connection is for a speed sensor, does anyone know what that is for? Maybe it was the 100Km/hr alarm they have in Japan?
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Old 09-10-2008, 12:35 AM   #3
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what o2 clamp are you using? i got the one that Joe made and i did not have to do anything to the ecu just spliced into the o2 sensor and emu.
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Old 11-01-2008, 05:56 AM   #4
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It's a homemade O2 clamp triggered by the V-tec output. But there are 3 O2 sensor inputs on the factory ECU according to the Mazda factory manual, but as per my previous post only one has a wire?
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Old 11-01-2008, 09:19 AM   #5
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Use the one labeled "Front"
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Old 11-27-2008, 06:39 AM   #6
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Thanks for that by the way. All installed now, recheck the wiring on saturday and should be good to go. It's unfortunate all the maps have gone from this forum.
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Old 11-27-2008, 10:53 AM   #7
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Quote:
Originally Posted by Poison View Post
It's unfortunate all the maps have gone from this forum.
It's that damn Megasquirt virus.
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