Switching from 1-wire to a 4-wire O2 sensor
08-17-2004, 11:50 PM
#1
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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.
08-18-2004, 10:06 AM
#3
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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?
: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
The gray is the signal and the black is ground
08-18-2004, 10:10 AM
#4
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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.
08-18-2004, 10:13 AM
#5
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Re:Switching from 1-wire to a 4-wire O2 sensor
found this on HT as well. from a respected member.
i should edit my post above.. C plug is D plug.. no C plug in obd1.
yel/blk - A25 - 12V switched
org/blk - A6 - O2 heater control
grn/wht - D22 - sensor ground
wht/red - D14 - O2 signal wire.
org/blk - A6 - O2 heater control
grn/wht - D22 - sensor ground
wht/red - D14 - O2 signal wire.
08-18-2004, 10:14 AM
#6
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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.
08-18-2004, 10:19 AM
#7
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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.
08-18-2004, 10:27 AM
#10
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Re:Switching from 1-wire to a 4-wire O2 sensor
