Pat_Ek1984

Gotta 2000 Civic Sedan and the tach doesn't work.It came with a B20 non v and was converted from auto to manual,if that helps.CEL light is on and cannot be read aswell FML.Has a Obd1 p75 and a stepdown, pretty sure a eBay one idk.Any advise is highly appreciated.

Cheers.

tony_2018

obd2b gets tach from the ecu, you sir will have to run your own tach from the dizzy.

Pat_Ek1984

As in screwing down a huge tach on my dash 🥺

Pat_Ek1984

That kinda sucks man

tony_2018

No, you run a wire from the distributor to the wire to the back of the cluster that provides signal to your tach.

Pat_Ek1984

Like seriously??😲

Pat_Ek1984

Sounds like you know a bit more than I do, lol can you tell me which color on this dizzy I'm looking for??

If I'm correct I think it's a 8 pin clip or something like that..

JRCivic1

You will need to connect the ICM wire (yellow/green) either at the distributor or inside the car at the original ECU plugs to either the tach output wire at the ECU or the blue wire on the driver's side near the firewall that is taped to the chassis harness with a black rubber plug cover (this is the tach test connector). Now, IF you have an aftermarket distributor, it is likely that the igniter is too weak to power the tachometer and your wiring may be just fine. Get an OEM distributor and try again. Most ECU adapter harnesses have the ICM and tach output wire connected together already... so you can verify this just to make sure. It can be done there if it was accidentally omitted.

Pat_Ek1984

Awesome bro!
Bout to give it a try.
Brb in a few with an update.

mk378

An OBD1 ECU can't interact with an OBDII reader. OBD1 codes are checked by putting the test jumper in and counting the CEL blinks.

Pat_Ek1984

Is this what I'm looking for??

Pat_Ek1984

UPDATE

Come to find out,inside my dizzy the actual Yellow wire with the green line had a nasty rip.I soldered it, and now rpm is working as it should be.Thank you all.

Just so you know,if this issue so happen to you take a close look inside your distributor.Again thank you all.

JRCivic1

Yes, that blue wire would have been the correct location. Glad you found that damaged wire inside the dizzy... since your tach now works, this means that your adapter harness is wired correctly and making the signal full strength corrects the loss of tach signal. Congrats sir.

EsotericImage

iTrader: (8)

Holy dirty oily engine!

Pat_Ek1984

YES SIR!!!
Now I just have the CEL that's haunting me,I have a post up about it as well.Thanks again.