Tach Issues

[viperkillertt]

No tach signal at igniter, no tach signal at the plug under the dash. No signal through whole wire. It is a black wire according to the diagrams and it comes off of the small plug off of the igniter. The car runs fine, but just cant get any signal. Please let me know what might be going on. Thanks!

 

[Bigzavs]

my friend had a similar problem on a car he just swapped, ill ask him if he ever figured it out

 

[p5150]

do you have a tach signal at the ignitor? Hook a timing light or an extra tachometer to it and check it out. If you have a signal there it is a wiring issue.

 

[viperkillertt]

do you have a tach signal at the ignitor? Hook a timing light or an extra tachometer to it and check it out. If you have a signal there it is a wiring issue.

Yeah, i said i didnt have signal at igniter. I am following the wiring diagram and it doesnt have signal. Anyone know?

 

[viperkillertt]

my friend had a similar problem on a car he just swapped, ill ask him if he ever figured it out

That would be super helpful.

 

[suprastanger507mgte]

follow the ignitor wires to the coil packs. check to make sure if the wires are properly conneted. Are you sure the tach signal is coming off the small connector? I looked at the 2jz wiring and the tack signal is coming off the big connector....and they both use the same ignitor...double check ...

 

[viperkillertt]

Thank you, the wiring diagram i have says the small plug. I will check when i get home. Thanks!

 

[viperkillertt]

okay, i really need help. none of the tach sensors are working. The ecu is getting the correct reading, but nothing from the igniter. Please help. I see people posting issues with tachs all the time, but i cant find a fix for them. The body is a 1989 and it has a new transplant 1jz. Please advise. Thanks!

 

[tissimo]

maybe the ignitor is dead? it should be producing a signal at the ignitor.. if its not i'm assuming the ignitor..

 

[suprastanger507mgte]

maybe the ignitor is dead? it should be producing a signal at the ignitor.. if its not i'm assuming the ignitor..

I agree. I just went through a bad ignitor. Car was starting and idling like normal. Try revving the car a bit and seeif it revs all the way or just starts to break up. Mine kept breaking up when I revved.....but the stock like idling threw me off until I swapped ignitors.
And yes, my tach was not working either...when hooked up. The signal to the tach and the ecu should be coming from the same wire btw. I tested the igniitor in another car and it was indeed bad.

 

[p5150]

what are you using to test the signal on your ignitor?

 

[viperkillertt]

Well, it runs and drives totally fine. My Avcr and NEO reads the signal fine from the ecu, but when trying to tap any of the signals, nothing is there. The igniter seems totally functional, no breaking at any point.

I agree. I just went through a bad ignitor. Car was starting and idling like normal. Try revving the car a bit and seeif it revs all the way or just starts to break up. Mine kept breaking up when I revved.....but the stock like idling threw me off until I swapped ignitors.
And yes, my tach was not working either...when hooked up. The signal to the tach and the ecu should be coming from the same wire btw. I tested the igniitor in another car and it was indeed bad.

 

[viperkillertt]

what are you using to test the signal on your ignitor?

Many different things, an aftermarket tach that can deal with any combination of signals. Also a gauge that reads rpm adn other readings and then a volt meter and the stock tach. None of them read a signal from any of the wires taht are suppose to be sending a tach signal.

 

[Ken]

that happened to me before. I just ran a jumper wire from pin #1 of the small igniter plug to the terminal on the backside of the gauge cluster for the tach to test.

 

[suprastanger507mgte]

Many different things, an aftermarket tach that can deal with any combination of signals. Also a gauge that reads rpm adn other readings and then a volt meter and the stock tach. None of them read a signal from any of the wires taht are suppose to be sending a tach signal.

Have you tried running a wire staright from the ignitor to the tach signal directly? or are you picking them from the harness......there could be a break which is what I am getting at.

 

[viperkillertt]

The tach requires a square wave 12 volt signal. The black wire is not sending that off. Also, the wire is just fine, both ends have been tested. I am seriously baffled by this. Does anyone have any other ideas? Thanks!

 

[RWHP]

Did you get the tach to work? I'm having the same problem as you.

 

[viperkillertt]

Did you get the tach to work? I'm having the same problem as you.

Yes i did. You just need to purchase a tach adapter. I got mine off of ebay for like 40 bucks. They are retailed at like 70. It works like a charm. There are a few posts about them with reviews. I forgot the name of mine again. It isnt the msd one, it is the other one.
TTFN