hello. I need the pin numbers for a 94-95 obd1 gsr computer, where the 02 sensor wires plug into. I have a 94 civic cx with a 98 gsr engine. i used my stock wiring harness and wired in vtec on my own. but now I need to wire in a 4-wire 02 sensor. but i need the pin numbers on the computer, can n-e-one help me??

 

D14 (O2S) - this is the O2 sensor signal.
D22 (SG2) - signal ground

A25 & B1 (IGP1 & IGP2) are +12v power from the main relay, to power the heater.
A6 (O2SHTC) - the ECU closes this to ground to turn on the heater.

 

hey bro, i cant thank you enough, i have needed his info for a while, well, now, about the wire colors which are which. I have a 4-wire o2 sensor off a 96 dx civic coupe. its green, white, and 2 blacks. which ones go to which pins, does it matter??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Teamsteadfasthatch &raquo;</TD></TR><TR><TD CLASS="quote">... which ones go to which pins, does it matter??</TD></TR></TABLE>It sure does, but I don't know the answer.

The 2 blacks should be the heater. Should be 10 to 40 ohms between them, and NO continuity to ground. I don't think it matters which is which.

The others are the sensor. Maybe(?) one of them has continuity to the sensor ground? Unless the sensor is up at operating temperature, the green & white will probably measure open between them. I'm gonna GUESS that green is the signal.

 

ok, im a bit confused. ok, i have d-14 which is sensor signal, d-22 which is gnd, then A-25 and b1 are 12v power, then a6. thats 5 pins. y is there an extra pin if its 4 wire?

 

A-25 & B-1 are wired together. They're both +12v power from the main relay, so you can take either one. The wiring diagram in my Helm book shows A-25 & B-1 connected together, along with the wire to the sensor heater & a couple other things. Think of it this way - main relay supplies power to the injectors, the O2 sensor heater, the ECU, the fuel pump, etc...

It doesn't really show exactly where that connection is made, physically in the car. So they may not be connected together right there at the ECU plugs. Maybe there's more than one wire coming off that terminal at the main relay.

 

 

man, this will definitly help. i cant thank you enough.

 

ok, guys, i need help again. I extended my wires from my 02 sensor, tapped into d-14(white), d-22(green), and (black)a6. i was not sure where to tap my last black wire. i tapped it into a-23, check enginelight still on, then i tapped it into a-25 like you said, still engine light on. then i noticed on that diagram you guys provided. im suppose to tap that last black wire into the wire by the brake fluid can right? i need heeeelp.

 

A-23 was a ground, so it shouldn't have worked. Did you clear your ECM after this?

A-25 & B-1 are +12v power from the main relay. My Helm book says it's yellow with a black stripe. I'm guessing the wire you're looking for at the brake cylinder is also switched power. Check it with a voltmeter. It needs to be a were that's on when the engine is running.

That picture almost looks like it's pointing to the wrong wire? Hard to tell because cameras & computers can do funny things with colors...

 

Jim blak, muller, you guys are the best! got my car fixed. i tapped that last black wire from my sensor into that yellow and black wire, and bam, check engine light came off, motor stopped stinking and runnin rich, and started operating normally. hopefullly ill get a better time at the track today. i run 1/ mile here, my best was a 9.6 @73. hopefully now taht my sensor is hooked up, ill run way better. thanks alot guys.

 

this is an awesome pic...
I needed to bookmark it!