Tach - 2jz swaps

[suprastanger507mgte]

Well, my tach works, but it moves too slow. It worked fine with the 1jZ setup and revs were accurate as well.

With the 2JZ, I have it wired in as it should - ( Tach Signal coming from the Bigger of the two Ignitor plugs).

Does anyone else have this problem? Am I running the correct signal from the Ignitor? I have traced this signal over and over again just to make sure...yet....nothing doing...

Can someone post the plug and the wire you tapped the Tach signal from on a 2JZ swap please?
Thanks.

Moe.

 

[tlo86]

aftermarket tach right?

 

[suprastanger507mgte]

aftermarket tach right?

Stock.

 

[tlo86]

i used a digital->analog converter

 

[tissimo]

what do you mean slow?

 

[suprastanger507mgte]

what do you mean slow?

When the car is idling, it sits around the 1st mark like it is turned off... When I actually drive the car, the needle creeps up the numbers real slow...

 

[tissimo]

you probably have it tapped to the wrong wire..

i think the signal comes off the small connector pin 1

 

[suprastanger507mgte]

you probably have it tapped to the wrong wire..

i think the signal comes off the small connector pin 1

Yeah that is what I'm trying to decipher. The tach signal the wiring diagram shows = Black/white wire coming off the ignitor. ( going by the 95 tsrm)

I do recall finding the tach signal oon the smaller plug when I was wiring it for the 1jz. ( Black wire off the smaller plug). Thanks, I will look into that later today.

 

[tissimo]

mkiv works differently.. iirc their tach signal comes from the ecu not the ignitor like the a70.. Go by the 1jz wiring.. and it comes from pin 1 on the small plug

 

[suprastanger507mgte]

mkiv works differently.. iirc their tach signal comes from the ecu not the ignitor like the a70.. Go by the 1jz wiring.. and it comes from pin 1 on the small plug

Kool, I look at the PIN 1. I have a1JZ at my disposal and will use it to track.

MKIV's tach signal = Signal from ignitor comes and splits in a two way. One signal end goes to the tach, the other goes to the ECU.That is how I have beem follwoing. I am sure I have the wrong signal because currently its wired ito the Black/white wire from the large Plug on the ignitor per MKIV TSRM.
I'll follow the 1JZ method to see of it works.

 

[annoyingrob]

The 1JZ tach gets its signal from the black/red wire on the igniter.

You most likely tapped into one of the control lines, and thus are getting exactly 1/6 the signal you should be getting.

 

[Dr Tweak]

The tach signal definitely is on the smaller igniter plug, and as far as I've ever seen, is black.

If you have a non-turbo tach, then you will need a tach adapter unit. We carry these in stock.

-Doc

 

[suprastanger507mgte]

The tach signal definitely is on the smaller igniter plug, and as far as I've ever seen, is black.

If you have a non-turbo tach, then you will need a tach adapter unit. We carry these in stock.

-Doc

Kool thanks Doc.
I tried that black wire from the ignitor to the tach, but it was doing the same thing. I think this is because of the fact I did not hook up my Gauge clusters ground wire to a ground source. This was also causing other gauges to not work as well. Yesterday, I wired in the ground and connected all the gauges and now they work properly. I have not tested the Tach again with the ground connected as I was too anxious to go out and drive the car ...
I do have a turbo Tach which was working fine with my 1JZ setup,. lol.

Thanks for the inputs, guys. I think this will definitely help others as well. I will update tonight...

Moe.

 

[annoyingrob]

The tach signal definitely is on the smaller igniter plug, and as far as I've ever seen, is black.

If you have a non-turbo tach, then you will need a tach adapter unit. We carry these in stock.

-Doc

It's black with red dots on it isn't it? Mine was,

 

[suprastanger507mgte]

okay, tried the black wire on the smaller plug, no go.
tried the Black/red wire ofrom the tach lead on the bigger connector, = no go.
tried another black wire on the bigger lead = no go.

So I am stumped. Anyone has an actual Aristo wiring diagram? I am going by the 2JZ o5 MKiV wiring...and I know the colors are different. The pins may be too..l

So , the whatever the ignitor signal is, goes into the ECU @ pin# 16, Red/yellow wire?
The should I tap the wire from PIN # 57 for the rpm signal???
What am I screwing up here???

 

[tlo86]

Im curious as to if the tach would work for a 7mgte cluster on the aristo? dr tweak said it wouldnt~ so im not sure.... he did my harness and did a superb job at it...

 

[suprastanger507mgte]

Im curious as to if the tach would work for a 7mgte cluster on the aristo? dr tweak said it wouldnt~ so im not sure.... he did my harness and did a superb job at it...

Well, I think a bunch of other guys got it to work with the 7mgte tach. It works for the 1JZ ,I don't see why it should not work for the 2jz. Its the same signal I assume. I know the 7mGE tach needs to have a resistor replaced though.

I'm still stumped with mine ...that is the only thing not working..grrrrrr...

 

[tissimo]

the ignitor output is the same.. Im going to have to say maybe your tach got fried when it was hooked up to the wrong thing?

 

[tlo86]

the ignitor output is the same.. Im going to have to say maybe your tach got fried when it was hooked up to the wrong thing?

it could've been, especially if power was sent through ground. usually stuff just stops working outright after that happens.

 

[suprastanger507mgte]

Does anyone have the actual Aristo Wiring diagrams ?????

Here is the weired thing though :

When I hookup the signal ( Pin 1/ Black wire)) from the smaller plug on the ignitor, the tach gives no movement at all.

When I hookup the Black/white wire from the bigger plug, ( I am sure this is not the signal source for Tach), the tach actually moves. The needle stutters at idle and says a notch above zero.It sould be around the 700 mark at least.
When I rev the car, the needle actually moves....but definitely not in proportion to the revving..it moves slowly....
Maybe my bad ignitor which I recently replaced fried the electronics on the tach ?? I will pull it out and look to see if the circut board has any burnt resistors..there's 4 or 5 of them.

Thanks for the help again guys...I will get to the bottom of this. I will wire the AVCR and see if the rpm signals are coming though..