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D See 2 · 03-18-2003, 12:25 PM

how do you wire in a 4 wire o2 sensor into a 95 civic cx? using a p28 ecu. pin locations etc.

chet · 03-18-2003, 12:58 PM

its part of the wiring harness....only the vx requires going from 5-wire to 4-wire o2 sensor.

SixtySecondAssassin · 03-18-2003, 01:45 PM

what do you mean its part of the harness?

i used the harness that came with the engine as a guide. the pin locations for 2 of the wires can be found in the reference section of this site. the other 2 are grounds.

pills_PMD · 03-18-2003, 02:00 PM

what he's saying is that 92-95 civics all use 4 wire O2 sensors.
the vx uses a 5 wire.

SixtySecondAssassin · 03-18-2003, 02:49 PM

i have a 92 cx and had a single wire o2 sensor.

pills_PMD · 03-18-2003, 05:46 PM

hmm i stand corrected then. i thought they were all the 4 wires

D See 2 · 03-18-2003, 11:32 PM

Quote:

Originally posted by SixtySecondAssassin@Mar 18 2003, 02:54 PM
i have a 92 cx and had a single wire o2 sensor.

yea, and my question is... if you are going to run a p28, how do you convert to a 4 wire... what pins does each go to?

pills_PMD · 03-18-2003, 11:52 PM

look at my article on p28/p30 pinout chart

pissedoffsol · 03-19-2003, 03:05 AM

right- the cx is a one wire.

simply pick up a z6 or similar o2 sensor with the wiring.

there are 2 balck wires, a white and a green if memory serves.

D See 2 · 03-19-2003, 06:55 AM

Quote:

Originally posted by pissedoffsol@Mar 19 2003, 03:10 AM
right- the cx is a one wire.

simply pick up a z6 or similar o2 sensor with the wiring.

there are 2 balck wires, a white and a green if memory serves.

your memory is working fineee. however, the white wire gets connected to the stock o2 wire as it goes to pin D14, the green wire, i am assuming goes to pin A6, so where do the other black wires go... chasis ground or pin D21 (sensor ground)?

pissedoffsol · 03-19-2003, 07:18 AM

im not sure. there is definitly not a chassis ground on the o2. it goes into a harness back to to ecu- so im assuming there should be a pin for it. That, or it meets up with other grounds.
the other black wire is the heater wire i belive.

D See 2 · 03-19-2003, 09:59 AM

my girl has a 94 civic ex automatic. Will the pin locations of an automatic p28 be the same for a manual (as far as the oxygen sensor is concerned?) I'll try to trace the wires back to the ecu and let everyone know. But when looking at the p28 ecu pinout chart in the reference section. I dont see where they could go.

D See 2 · 03-19-2003, 01:33 PM

so here's what we know so far... and please... correct me if i'm wrong.

white wire on o2 sensor is the primary signal and goes to pin D14 (sure)
green wire on o2 sensor is the heater for the sensor and goes to pin A6 (pretty sure)

so where do the other two black wires go? anyone care to take a look for us?

SixtySecondAssassin · 03-19-2003, 01:48 PM

allow myself to quote myself

Quote:

Originally posted by SixtySecondAssassin@Mar 18 2003, 12:50 PM
the pin locations for 2 of the wires can be found in the reference section of this site. the other 2 are grounds.

pissedoffsol · 03-19-2003, 02:10 PM

im not so sure the 2 blacks are grounds

when i put my header on, i cut the harness to re-locate the o2 down to by the cat instead of in the runner.

now, when i put it back together, i had connected the black wires wrong.
the car ran for about a min, and then died.... just stalled right out- CEL. It was a 50-50 shot, and that was the #1 thing that i thought could have been wrong, so we swapped the two balck wires.
its ran ever since.

now, if they were both grounds, exmpalin the above.

D See 2 · 03-19-2003, 02:26 PM

Quote:

Originally posted by pissedoffsol@Mar 19 2003, 02:15 PM
im not so sure the 2 blacks are grounds

when i put my header on, i cut the harness to re-locate the o2 down to by the cat instead of in the runner.

now, when i put it back together, i had connected the black wires wrong.
the car ran for about a min, and then died.... just stalled right out- CEL. It was a 50-50 shot, and that was the #1 thing that i thought could have been wrong, so we swapped the two balck wires.
its ran ever since.

now, if they were both grounds, exmpalin the above.

interesting facts brian... but your point is well taken. if they were both grounds, they would be interchangeable. where might we find this info?

SixtySecondAssassin · 03-19-2003, 03:00 PM

i tied both into the ground circuit and it runs great

edit: and my CEL isnt on

D See 2 · 03-19-2003, 08:57 PM

which ground circuit? where exactly?

D See 2 · 03-20-2003, 07:56 AM

this came straight from an old sport compact car magazine on a Hot-To for b16a into 92-95 civ...

solblu · 03-22-2003, 02:53 AM

here

A6 = black under white wire
A25=black under green wire
D14= white wire
D22 = green wire

AllMotorMonster · 03-23-2003, 12:36 PM

02 sensors and the CX engine.

92-93 = 1 wire

94-95 = 4 wire

D See 2 · 03-23-2003, 12:44 PM

Quote:

Originally posted by AllMotorMonster@Mar 23 2003, 12:41 PM
02 sensors and the CX engine.

92-93 = 1 wire

94-95 = 4 wire

na y0,... i just looked at a 95 civic cx and it had 1 wire o2 sensor. i am 100% sure...

AllMotorMonster · 03-23-2003, 04:54 PM

Quote:

Originally posted by one zexy crx+Mar 23 2003, 12:49 PM--><div class='quotetop'>QUOTE(one zexy crx @ Mar 23 2003, 12:49 PM)</div><div class='quotemain'> <!--QuoteBegin-AllMotorMonster@Mar 23 2003, 12:41 PM
02 sensors and the CX engine.

92-93 = 1 wire

94-95 = 4 wire

na y0,... i just looked at a 95 civic cx and it had 1 wire o2 sensor. i am 100% sure... [/b][/quote]
Is your 95 a federal or california car?

Maybe there is a difference.

Spyderturbo · 04-13-2003, 06:38 PM

I just swapped my CX on Saturday and I am dealing with this now and it is killing me! My 94 CX is a federal car, and it is one wire 02 sensor, the D16Z6 I put in is 4 wire, I think I can figure it out with all the info here, and hopefully I can get it to run now!

-Matt

Spyderturbo · 04-14-2003, 08:49 PM

For anyone interested the 94 CX firewall harness is pre-wired for a 4 wire 02, so if your using a VTEC engine harness the 02 portion plugs in at the strut tower, you only need to run VTEC, at least that's how my 94 CX is wired....

-Matt

03-18-2003, 12:58 PM	#2
chet Senior Member Join Date: Sep 2002 Location: st petersburg, florida Posts: 888 iTrader: 0 / 0% Rep Power: 23	its part of the wiring harness....only the vx requires going from 5-wire to 4-wire o2 sensor. __________________ <a href=\'http://www.geocities.com/coker_boy/honda.html\' target=\'_blank\'>The Green Machine</a>

03-18-2003, 01:45 PM	#3
SixtySecondAssassin Senior Member Join Date: Sep 2002 Location: Austin, TX Posts: 1,071 iTrader: 0 / 0% Rep Power: 25	what do you mean its part of the harness? i used the harness that came with the engine as a guide. the pin locations for 2 of the wires can be found in the reference section of this site. the other 2 are grounds. __________________ .....deagle.....

03-18-2003, 02:49 PM	#5
SixtySecondAssassin Senior Member Join Date: Sep 2002 Location: Austin, TX Posts: 1,071 iTrader: 0 / 0% Rep Power: 25	i have a 92 cx and had a single wire o2 sensor. __________________ .....deagle.....

03-19-2003, 09:59 AM	#12
D See 2 Senior Member Join Date: Sep 2002 Location: Baltimore, MD Age: 25 Posts: 2,401 iTrader: 0 / 0% Ride: '92 Civic CX Rep Power: 39	my girl has a 94 civic ex automatic. Will the pin locations of an automatic p28 be the same for a manual (as far as the oxygen sensor is concerned?) I'll try to trace the wires back to the ecu and let everyone know. But when looking at the p28 ecu pinout chart in the reference section. I dont see where they could go. __________________ Garage: 1992 CX Hatch > Current Money Pit Grave: R.I.P. 1995 Integra GSR R.I.P. 1990 DX Hatch R.I.P. 1990 CRX Si

03-19-2003, 01:33 PM	#13
D See 2 Senior Member Join Date: Sep 2002 Location: Baltimore, MD Age: 25 Posts: 2,401 iTrader: 0 / 0% Ride: '92 Civic CX Rep Power: 39	so here's what we know so far... and please... correct me if i'm wrong. white wire on o2 sensor is the primary signal and goes to pin D14 (sure) green wire on o2 sensor is the heater for the sensor and goes to pin A6 (pretty sure) so where do the other two black wires go? anyone care to take a look for us? __________________ Garage: 1992 CX Hatch > Current Money Pit Grave: R.I.P. 1995 Integra GSR R.I.P. 1990 DX Hatch R.I.P. 1990 CRX Si


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03-18-2003, 12:25 PM	#1
D See 2 Senior Member Join Date: Sep 2002 Location: Baltimore, MD Age: 25 Posts: 2,401 iTrader: 0 / 0% Ride: '92 Civic CX Rep Power: 39	how do you wire in a 4 wire o2 sensor into a 95 civic cx? using a p28 ecu. pin locations etc. __________________ Garage: 1992 CX Hatch > Current Money Pit Grave: R.I.P. 1995 Integra GSR R.I.P. 1990 DX Hatch R.I.P. 1990 CRX Si

03-18-2003, 02:00 PM	#4
pills_PMD Super Moderator Join Date: Sep 2002 Location: New Albany, OH Posts: 4,262 iTrader: 0 / 0% Ride: 01 is300, 05 s2000, 03 rx300 Rep Power: 57	what he's saying is that 92-95 civics all use 4 wire O2 sensors. the vx uses a 5 wire.

03-18-2003, 05:46 PM	#6
pills_PMD Super Moderator Join Date: Sep 2002 Location: New Albany, OH Posts: 4,262 iTrader: 0 / 0% Ride: 01 is300, 05 s2000, 03 rx300 Rep Power: 57	hmm i stand corrected then. i thought they were all the 4 wires

03-18-2003, 11:52 PM	#8
pills_PMD Super Moderator Join Date: Sep 2002 Location: New Albany, OH Posts: 4,262 iTrader: 0 / 0% Ride: 01 is300, 05 s2000, 03 rx300 Rep Power: 57	look at my article on p28/p30 pinout chart

03-19-2003, 03:05 AM	#9
pissedoffsol RETIRED Join Date: Sep 2002 Location: Retirement Home Age: 29 Posts: 49,951 iTrader: 2 / 100% Ride: Electric Scooter Blog Entries: 1 Rep Power: 531	right- the cx is a one wire. simply pick up a z6 or similar o2 sensor with the wiring. there are 2 balck wires, a white and a green if memory serves.

03-19-2003, 07:18 AM	#11
pissedoffsol RETIRED Join Date: Sep 2002 Location: Retirement Home Age: 29 Posts: 49,951 iTrader: 2 / 100% Ride: Electric Scooter Blog Entries: 1 Rep Power: 531	im not sure. there is definitly not a chassis ground on the o2. it goes into a harness back to to ecu- so im assuming there should be a pin for it. That, or it meets up with other grounds. the other black wire is the heater wire i belive.

03-19-2003, 02:10 PM	#15
pissedoffsol RETIRED Join Date: Sep 2002 Location: Retirement Home Age: 29 Posts: 49,951 iTrader: 2 / 100% Ride: Electric Scooter Blog Entries: 1 Rep Power: 531	im not so sure the 2 blacks are grounds when i put my header on, i cut the harness to re-locate the o2 down to by the cat instead of in the runner. now, when i put it back together, i had connected the black wires wrong. the car ran for about a min, and then died.... just stalled right out- CEL. It was a 50-50 shot, and that was the #1 thing that i thought could have been wrong, so we swapped the two balck wires. its ran ever since. now, if they were both grounds, exmpalin the above.

03-19-2003, 03:00 PM	#17
SixtySecondAssassin Senior Member Join Date: Sep 2002 Location: Austin, TX Posts: 1,071 iTrader: 0 / 0% Rep Power: 25	i tied both into the ground circuit and it runs great edit: and my CEL isnt on __________________ .....deagle.....

03-19-2003, 08:57 PM	#18
D See 2 Senior Member Join Date: Sep 2002 Location: Baltimore, MD Age: 25 Posts: 2,401 iTrader: 0 / 0% Ride: '92 Civic CX Rep Power: 39	which ground circuit? where exactly? __________________ Garage: 1992 CX Hatch > Current Money Pit Grave: R.I.P. 1995 Integra GSR R.I.P. 1990 DX Hatch R.I.P. 1990 CRX Si

03-20-2003, 07:56 AM	#19
D See 2 Senior Member Join Date: Sep 2002 Location: Baltimore, MD Age: 25 Posts: 2,401 iTrader: 0 / 0% Ride: '92 Civic CX Rep Power: 39	this came straight from an old sport compact car magazine on a Hot-To for b16a into 92-95 civ... __________________ Garage: 1992 CX Hatch > Current Money Pit Grave: R.I.P. 1995 Integra GSR R.I.P. 1990 DX Hatch R.I.P. 1990 CRX Si

03-22-2003, 02:53 AM	#20
solblu Senior Member Join Date: Jan 2003 Location: Ricer Posts: 378 iTrader: 0 / 0% Rep Power: 17	here A6 = black under white wire A25=black under green wire D14= white wire D22 = green wire __________________ <a href=\'http://www.knology.net/~jediklc/\' target=\'_blank\'>My Webpage</a> <a href=\'http://www.geocities.com/DawgSol94S/Welcome.html\' target=\'_blank\'>Team Sol Georgia</a>

03-23-2003, 12:36 PM	#21
AllMotorMonster Senior Member Join Date: Oct 2002 Location: Inland Empire foo! Posts: 542 iTrader: 0 / 0% Rep Power: 20	02 sensors and the CX engine. 92-93 = 1 wire 94-95 = 4 wire __________________ <a href=\'http://www.ask.com\' target=\'_blank\'>Learn everything you ever wanted to know about engine building, chassis setup and ECU's</a>

04-13-2003, 06:38 PM	#24
Spyderturbo Senior Member Join Date: Nov 2002 Location: PA Age: 34 Posts: 151 iTrader: 0 / 0% Rep Power: 16	I just swapped my CX on Saturday and I am dealing with this now and it is killing me! My 94 CX is a federal car, and it is one wire 02 sensor, the D16Z6 I put in is 4 wire, I think I can figure it out with all the info here, and hopefully I can get it to run now! -Matt __________________ -Matt 2000 Civic EX Coupe 1990 Mustang LX 5.0 2002 Explorer Eddie Bauer

04-14-2003, 08:49 PM	#25
Spyderturbo Senior Member Join Date: Nov 2002 Location: PA Age: 34 Posts: 151 iTrader: 0 / 0% Rep Power: 16	For anyone interested the 94 CX firewall harness is pre-wired for a 4 wire 02, so if your using a VTEC engine harness the 02 portion plugs in at the strut tower, you only need to run VTEC, at least that's how my 94 CX is wired.... -Matt __________________ -Matt 2000 Civic EX Coupe 1990 Mustang LX 5.0 2002 Explorer Eddie Bauer

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Civic Cx - 1 Wire To 4 Wire O2 Sensor