Please, no one say I should have a wideband and lecture me about all that. I know widebands are used for tuning and etc, but my 89' Turbo II is just a daily driver.

Does anyone know what wire to wire the gauge into from what pin on this ECU?

Please PM me or copy paste my pics and circle what pin. Thanks.

 

It is in the FSM for your particular year of car. Should take you 5 minutes to find.

http://www.teamfc3s.org/main/factory...ual/1989_1991/

It is in section 4b I believe.

 

FSM fuel and emission section. ECU pinouts are listed there.

 

EVERYONE should have this link. We need to put this link in the 2nd gen FAQ!

http://wright-here.net/cars/rx7/manuals.html


.

 

You guys are awesome. Thanks a lot. Saved me a lot of time.

 

So another question here...

I followed the diagram, pretty easy, but I have no response from my gauge. It lights up and everything. Needle doesn't move though.

From the diagram below it should be 2C right? or am I wrong? Please give feedback.

 

Yeah, you may have mis-identified the wire though. The wire on pin 2C should be black.

 

It was black. Maybe its the 02 sensor?

 

You'd have an error code on the ECU if that where the case.

 

hmmm... running out of ideas. Everything was wired correctly, but I have no idea now. I guess I will give up. lol. Least my boost gauge works.

 

Well, did you warm the car up and actually drive it?

 

Well it wasn't warm but shouldn't I have seen some response from the gauge by just having the car started?

 

i thought it was suppose to splice into the 02 wire? as close as possible to the ecu?

 

If you look at the diagram above, the O2 wire is 2C. Tried that, but gauge didn't work.

 

IF the 02 sensor is actually good and connected up, then at idle it won't show squat or much of anything IF the car has a functional airpump and ACV.

I'd get a meter out and backprobe the 2C..........................no, forget that.......... I'd go to the 02 sensor itself and disconnect it from the harness. Then with a meter probe the output of the 02 sensor with the engine running and see what the reading is. Should be b/t 0.0vdc to 0.9vdc. Rev the engine and see if it changes. OR if the airpump and ACV are functional, then remove the blue connector off the relief solenoid. The 02 output should now read approx 0.5vdc to 0.8vdc.

 

Thanks Hailers. BTW, I have no air pump. Emissions removed. Guess Ill get the ol' multimeter out.

 

awe, it dont work?

no light show for you

 

Well no volts coming from O2 sensor so replacing O2 sensor, oh and its not just the light show i want, its the needle moving too. Already got the light show. lol.

 

So I replaced the O2 sensor and wired in the air/fuel gauge and let the car warm up. took her for a drive and tada. The gauge works. Thanks everyone who helped out with this.