Hello. So the tachometer on my Felicia is not working. I tried reading some posts here about this issue but didn't understand exactly why the rpm gauge is not woking. Can someone please explain where do I have to look, what to check? The temp gauge is working, the speedometer also and fuel gauge as well. Any light?

 

First of all, the rest of the instruments have nothing to do with the tachometer. They use separate circuits.

 

My questions are:

1. has the tachometer ever worked since you own the car?
2. is there a yellow wire going from the ignition coil (pin 1) to the back of instrument cluster (yellow connector pin 7)?

I remember your car was bought in a very bad shape (recovered from a lake?) so it won't be an easy task to fix it.

Thank you Ricardo. I will check that today and get back to you. Thanks for the tips.

After you will have answers to my two previous questions, the next thing will be to take one or more well focused high resolution photos (in good light) of the area shown below. I will be able to tell you exactly what to do and where.

 

Same problem with me . 

But the rpm works when knocking on it on the dashboard

There is a cold solder joint on the PCB (marked area). Some copper tracks might be cracked too. Knocking on the dashboard will make things worse.

On 3/18/2017 at 16:31, RicardoM said:

There is a cold solder joint on the PCB (marked area). Some copper tracks might be cracked too. Knocking on the dashboard will make things worse.

Agreed; the fact that tapping the fascia can "kick" the techo into operating briefly just supports the dry joint on the PCB diagnosis.

This guy is really helpfull thanks a lot.

 

My tach only reads when it reaches 4000 rpm. Any suggestions.

 

5 hours ago, spoil_kid123 said:

Any suggestions.

Same problem. Cold solder joints, bad copper tracks.

 

Signed: "this guy".

Edited 29 March, 20179 yr by RicardoM

One more.  I still could not get my fuel guage working.

 

Can you indentify what section is the fuel circuit.

 

Cheers

 

 

Thanks very much.

Hi. I have a 1,6mpi dashboard and polo 6n2 gti 1,6 16v motor. When i take rpm signal from ecu to dash tachometer isnt working. Can i put in the signal to coolpack to some place in dash to tacho work? 

It is not about where to inject the signal to make it work. It is about how compatible is the rpm signal from 6N2 with Felicia rpm signal. I have no reference on 6N2.

IIRC the VW Polo 6N2 is using a CANbus communication which is totally different from Felicia bus communication.

Edited 10 August, 20205 yr by RicardoM

Yes thats the problem. But maybe can i solve the problem with coil signal? I now have aftermarket tacho where i wired the coil signal and it works like 2cyl engine because i have double coil. Can i this signal convert to those what original 1,6mpi signal was? 

Or midificate somehow my tacho to work with signal from coil? 

17 hours ago, Bialaskodarallyteam said:

Yes thats the problem. But maybe can i solve the problem with coil signal? I now have aftermarket tacho where i wired the coil signal and it works like 2cyl engine because i have double coil. Can i this signal convert to those what original 1,6mpi signal was? 

I suspect you will get half of the real rpm on the gauge. Try it.

On 11/08/2020 at 02:21, RicardoM said:

I suspect you will get half of the real rpm on the gauge. Try it.

Yes i have half of rpm. Can i try to wire 2 coils signal like on Photo and will it work? 

Might be possible. Not sure about the diodes though, they might be reversed since the pulses are positive. Try both ways.

It works perfectly only with 2 diodes 😊