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Owner of a rev2 3sge mr2 looking for some advice with connectors

1290 Views 13 Replies 4 Participants Last post by  natto, 
N
3
Hi everyone, this is my first post here. I've picked up a 1992 Rev2 with a 3sge and I was doing a bit of investigation and it doesn't seem to have an o2 sensor anywhere. The downpipe needs replacing and I can't find one without an o2 port (like the one that is currently on the car). There are three loose connectors on the timing belt side of the engine. Could anyone point me in the right direction regarding these or point me to where I might find the o2 sensor connector?

Many thanks,
Nathan

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GDII
Image 11 is ABS. Most cars have this sitting there like that. You will find one on the other side of the car too.
Image 30 is the AC compressor magnetic clutch power wire.
Image 50. I don't know this one.
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N
GDII said:
Image 11 is ABS. Most cars have this sitting there like that. You will find one on the other side of the car too.
Image 30 is the AC compressor magnetic clutch power wire.
Image 50. I don't know this one.
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Hi GDII, thanks for your response. Do you have any idea where the o2 sensor connector should be located?
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GDII
Back of the engine under the intake manifold. The sensor is in the B pipe after the exhaust manifold, there is no downpipe in an NA 3SGE.
This link to me replacing mine might help a bit.
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N
GDII said:
Back of the engine under the intake manifold. The sensor is in the B pipe after the exhaust manifold, there is no downpipe in an NA 3SGE.
This link to me replacing mine might help a bit.
Click to expand...
Is this the one I'm looking for? 2 pin connector under the intake manifold. Although, only one wire leads to the connector.
71275
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DeftAnesthetik
natto said:
Is this the one I'm looking for? 2 pin connector under the intake manifold. Although, only one wire leads to the connector.
View attachment 71275
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Pretty sure that one is for the oil level...
It looks to me like someone replaced the o2 end. that connector on first post (img 50) is not one I have seen before. O2 should be a 4 wire plug. 1 for power, 1 for ground, 1 for heater and 1 for o2 sensor reading
Does it appear to have been cut and a new end put on?
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N
DeftAnesthetik said:
Pretty sure that one is for the oil level...
It looks to me like someone replaced the o2 end. that connector on first post (img 50) is not one I have seen before. O2 should be a 4 wire plug. 1 for power, 1 for ground, 1 for heater and 1 for o2 sensor reading
Does it appear to have been cut and a new end put on?
Click to expand...
None of the connectors appear to have been cut and replaced, but I did read somewhere about early JDM 3sge-s having a 1 wire o2 sensor as opposed to the later 4 wire with a heater?
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GDII
The UK 3SGE does have the oil level sensor as but yes, the O2 sensor should be a 4 wire. The 3SGTE has single wire, the 3SGE never had a single wire. There is a single wire CAT temp sensor after the CAT but it's connected in the boot/trunk.
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N
GDII said:
The UK 3SGE does have the oil level sensor as but yes, the O2 sensor should be a 4 wire. The 3SGTE has single wire, the 3SGE never had a single wire. There is a single wire CAT temp sensor after the CAT but it's connected in the boot/trunk.
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Okay, I'll resume the search for that 4 pin connector tomorrow then! You said that it should be under the intake manifold, specifically what side and at what level? Which part of the wiring harness should it come off of?

Thanks for the help :)
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GDII
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It is normally attached to the steel plate on the rear right side of the engine. So attached to runner 1 and 2 of the intake manifold.

The plug should look something like this.


And the sensor is located here.
71279


Plug is located here.
71280
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O
If it’s a jdm spec it will be a single wire o2 sensor, I have a jdm turbo that runs a single wire N/A sensor used on both engines,there’s a secondary temp sensor lower down attached to the cat. The plug is slightly different to a North American spec sensor.
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N
My car doesn't have a cat and I found out that it's actually a Rev 1. Does this change anything?
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O
Nope as mine is a 91, the 02 sensor should come out the wire harness that goes over the valve cover comes out just above the AC,I have a down pipe so no heater sensor, just pull the bulb out off dashboard.
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N
Hi guys. Final update to this thread. After looking up my ecu part number, it turns out that I have a rev 1 3sge UK spec mr2. This model apparently has no o2 sensor according to multiple reputable sources. Regardless, thank you all for being so helpful!

Kind regards,
Nathan
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