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Switching from 1-wire to a 4-wire O2 sensor

Old 08-17-2004, 11:50 PM
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Default Switching from 1-wire to a 4-wire O2 sensor

I have a 93 CX that I swaped out the 8 valve head for a DX head. I also got a DX ECU so I could up my rev limit. Problem is a CX uses a 1-wire O2 and the DX uses a 4-wire. Car runs great but have O2 senor heating CEL. I have a 4-wire but not sure how to wire it in to the ECU. I think one of the 4 is a ground, another goes to the wire on my 1-wire O2 but don't know where the other two should go. I would guess one would be 12v and the other would go to the ECU but I'm not sure.
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Old 08-18-2004, 04:51 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

sorry to sound redundant but did you perform an OBD0 - OBD1 conversion here?
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Old 08-18-2004, 10:06 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

Originally Posted by quadnie
sorry to sound redundant but did you perform an OBD0 - OBD1 conversion here?
93 civic cx

:P

you just add 3 wires total to the existing harness.
a pinout i have states this

o2 heater pin A6 org/blk
o2 signal pin C14 white

what colours do u have on the actual sensor?

i found this on HT
The two whites are the heater wires.
The gray is the signal and the black is ground
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Old 08-18-2004, 10:10 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

No, I thought A 93 CX was OBD1. I thought it was strange that it has a 1-wire but the only diff. in the cars are 8 valves vs. 16 valves and rev limit between the CX vs. DX/LX. I thought all 92-95 civics are OBD1. All the sensors are the same and even the distributor.
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Old 08-18-2004, 10:13 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

found this on HT as well. from a respected member.

yel/blk - A25 - 12V switched
org/blk - A6 - O2 heater control
grn/wht - D22 - sensor ground
wht/red - D14 - O2 signal wire.
i should edit my post above.. C plug is D plug.. no C plug in obd1.
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Old 08-18-2004, 10:14 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

Originally Posted by REDLINE
No, I thought A 93 CX was OBD1. I thought it was strange that it has a 1-wire but the only diff. in the cars are 8 valves vs. 16 valves and rev limit between the CX vs. DX/LX. I thought all 92-95 civics are OBD1. All the sensors are the same and even the distributor.
no you're right. your car is obd1.. quandie is just a little tired
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Old 08-18-2004, 10:19 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

I just went out in the garage to check the wires and I can't find the sensor. Oh well, its out there somewhere but I'm almost positive that theres a black, gray and two whites.
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Old 08-18-2004, 10:23 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

Thanks for the pin #'s crx88si. Does it mater on the heater wire between the two grays?
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Old 08-18-2004, 10:23 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

Whites
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Old 08-18-2004, 10:27 AM
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Default Re:Switching from 1-wire to a 4-wire O2 sensor

im not sure.. i found this on HT also..

http://www.honda-tech.com/zerothread?id=962489
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