jzgte temp and tach fix
#17
Lexus Champion
Join Date: May 2005
Location: Central FL
Posts: 1,973
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by ConSynX
so did you do this last nite, and get it to work?
Ran out of time to plug it up, ill do it sunday. Im leaving at 3pm here to spend the weekend with the GF.
#21
This doesn't work, at least on a '95 SC300. Middle plug for instrument cluster has a white wire with a series of gray dashes on it. Then you've got two "brown with gray dash" wires, the difference between the two is one has two dashes in sequence, the other has just one. Bridging the white with gray to either of these results in nothing.
As for the resistor, in the location you specified my cluster has three blueish gray resistors...R130, R129, and R128. I didn't try using a jumper wire on any of these because of the visible difference between the cluster shown and my own. Where there is a visible inductor on the cluster shown, my cluster doesn't have one and I've got a power transistor where the pictured cluster does not.
Considering the differences in the 1JZ & US Spec 2JZ pinouts, I'm going to make a guess and say that the 1JZ tach pin is in the wrong location on the orange body connector, in regards to what the US 2JZ dash harness needs. I'm gonna trace out the stock 2JZ-GE harness and find where the tach wire ends up in the orange connector, versus where the tach wire is on the 1JZ orange connector. This may lead no where but it's better than chasing the wrong wires behind the dash.
As for the resistor, in the location you specified my cluster has three blueish gray resistors...R130, R129, and R128. I didn't try using a jumper wire on any of these because of the visible difference between the cluster shown and my own. Where there is a visible inductor on the cluster shown, my cluster doesn't have one and I've got a power transistor where the pictured cluster does not.
Considering the differences in the 1JZ & US Spec 2JZ pinouts, I'm going to make a guess and say that the 1JZ tach pin is in the wrong location on the orange body connector, in regards to what the US 2JZ dash harness needs. I'm gonna trace out the stock 2JZ-GE harness and find where the tach wire ends up in the orange connector, versus where the tach wire is on the 1JZ orange connector. This may lead no where but it's better than chasing the wrong wires behind the dash.
#22
Keeper of the light
iTrader: (17)
Since the plugs for the SC3 and SC4 are the same, you can have a look at this to see what it is that you are actually doing.
https://www.clublexus.com/gallery/sh...8/ppuser/13879
double click for high res.
https://www.clublexus.com/gallery/sh...8/ppuser/13879
double click for high res.
#23
Originally Posted by O. L. T.
Since the plugs for the SC3 and SC4 are the same, you can have a look at this to see what it is that you are actually doing.
https://www.clublexus.com/gallery/sh...8/ppuser/13879
double click for high res.
https://www.clublexus.com/gallery/sh...8/ppuser/13879
double click for high res.
EDIT: Interesting...the white wire mentioned above looks like one of the clock wires (for the clock button) and brown is just a ground. Something's not adding up here...
Last edited by kaosman; 04-18-06 at 07:44 PM.
#25
Lexus Champion
Join Date: May 2005
Location: Central FL
Posts: 1,973
Likes: 0
Received 0 Likes
on
0 Posts
ill post pics of my modded cluster by thursday sometime. You dont actually mod the wires, you do it on the circuit board behind the plug. I never got in depth on whats actually done and no one will spill the beans, but from my guesses are... your just giving the tach a power source to work.
#26
Lexus Test Driver
iTrader: (1)
for the 93 sc300 is seems the tach runs solely off the middle connector piece that is upper left most, and over(right) one on the plug, or upper right most, and over(left) one on the gauges.
i haven't opened mine up yet because i'm lazy. . .
basically just gonna try following the wires and making sure it goes to the ignitor.
i haven't opened mine up yet because i'm lazy. . .
basically just gonna try following the wires and making sure it goes to the ignitor.
#27
Originally Posted by VJ RC51
ill post pics of my modded cluster by thursday sometime. You dont actually mod the wires, you do it on the circuit board behind the plug. I never got in depth on whats actually done and no one will spill the beans, but from my guesses are... your just giving the tach a power source to work.
#28
Lexus Test Driver
iTrader: (4)
Join Date: Jul 2003
Location: Tennessee
Posts: 831
Likes: 0
Received 0 Likes
on
0 Posts
2 questions:
What is the reason for the tach and temp not working correctly, different wires on the 1jz harness?
And this seems to be a LOT of trouble... why not buy the MSD tach adapter?
What is the reason for the tach and temp not working correctly, different wires on the 1jz harness?
And this seems to be a LOT of trouble... why not buy the MSD tach adapter?
#29
Keeper of the light
iTrader: (17)
Originally Posted by kaosman
Well looks like you're right...I got inspired by the diagrams that OLT posted up and tested the tach wire (pin 9 of the middle connector, black wire) and this wire has continuity with the tach plug in the diagnostic connector, and the ignitor. So the issue isn't with the signal to the tach. I took it a step further and checked the two brown wires (grounds according to the diagrams) and one was grounded, the other was not. I grounded both (testing for voltage across first) and it didn't make a difference. I'm gonna look at the diagrams again and see where the tach gets power, that's probably why its not coming on.
Yep, I checked also and it does say black and it does go to the ignitor as suggested, the diagrams are correct as they should be
The other one that did not have ground may only have ground at a certain point. (key on , or after warm up, etc......)
#30
Originally Posted by O. L. T.
Yep, I checked also and it does say black and it does go to the ignitor as suggested, the diagrams are correct as they should be
The other one that did not have ground may only have ground at a certain point. (key on , or after warm up, etc......)
The other one that did not have ground may only have ground at a certain point. (key on , or after warm up, etc......)