microtech ltx8 20v problem

[deltathing]

ive finally gotten to the stage of starting the engine
although.....

All voltages are correct as per supplied diagrams. handset shows correct data for all sensors. but...no negative trigger is given to injector or ignition coil outputs when cranking over. even though the wiring is verified to be correct.

is there a mode or functon i need to enable to allow the ecu to do its thing? could it be a problem with the ecu itself?

there is no orange igntition light showing even though there is ignition power going into the unit.

please help/

[deltathing]

can someone please explain exactly which wires on a toyota CAS must be connected to the ltx8 ecu? the information i have to go by is an apparently legitimate microtech approved modified by dom printout from their website. it has information crossed out and changed such as the wires for the cas. the conflicting information is confusing.

[deltathing]

ok so the setup is as follows.

silvertop 20v

ltx8

4x bosch hec715 coils

does anyone have a manual for this ecu?
(ok just found this.. http://www.microtechusa.com/Download.../MT_manual.pdf

if the CAS is incorrectly wired would it cause the ecu to not trigger both the coils and injectors?

any light shed on the subject would be most appreciated.
thanks

[CrUZida]

Have you got an laptop plugged in?

You need to have both a working crank angle sensor AND cam angle sensor before the ecu will start firing the injectors.

If you have a laptop then you can tell they are working if the RPM moves.

Without the laptop you should be able to use the orange LED on the side of the ecu to determine if you have sensors working.

[deltathing]

no laptop is plugged in, only hand-controller, although no rpm shows on this.
this is essentially the same as having a laptop plugged in right? apart from being difficult to navigate.. i might have to borrow a laptop.

[CrUZida]

Never used a hand controller sorry.
And you'll need the dongle to work the lappie.

[deltathing]

i believe the CAS isnt giving any signal to the ltx8. does anyone know the correct wires to use. wires for the CAS out of the the ltx8 are red (data 1) green (data 2) and blue (gnd). The toyota 20v CAS has FOUR wires red (G1) green (G2) black (NE or GND) and white (G-). Does any one know the correct way to wire the two?

any help GREATLY appreciated

[CrUZida]

Not knowing the exact setup on the 4A I'm going out on a limb here.

There will be 2 wheels. A 2 tooth wheel, and a 24 tooth wheel.
The 2 tooth wheel is the Cam angle sensor, and the 24 tooth wheel is the Crank angle sensor.

You can get one of them backwards (polarity wise) and you'll still get spark (timing may be out though).
But if you get the other one backwards, you'll get nothing.

I think its the crank angle sensor that can be wired backwards and it will still run.


If there are 2 cam angle sensor pickups, then you'll have to try them both, I'm not sure which one it is.

[CrUZida]

G1 and G1- are normally the Cam1 sensor
G2 and G2- are normally the Cam2 sensor
NE and NE- are normally the Crank sensor.

All 3 -ve's are connected together.

[benjamin]

Are you sure that you have the colours right for your 20v CAS? I know my car is a MAP GZE but it should still run the same CAS. And for my car it seems that the CAS wiring is:

red is the trigger (NE)
green is the home pickup (G1)
white (G-)
My fourth colour is Blue for (G2)

I am yet to install the microtech and the following is only what I have researched.
Anyway according to the diagrams for the LTX8

red (ne) should go to the red wire from the Microtech
green (g1) should go to green from MT
white (g-) should be grounded

It doesn't seem that g2 gets used for the Microtech

If that is way wrong then please let me know as it will probably hinder my install aswell.

[CrUZida]

G2 does not get used for Microtech.

Toyota only uses it so that worst case the motor turns 1 rev before it knows when to start firing which coils/injectors.

[benjamin]

ok so:
your NE should go to Data 1 (black to red)
G1 goes to Data 2 (Red to green)
G- goes to gnd (white to blue)

I hope that works for you...

[deltathing]

benjamin you're a legend. that hit the spot. she's purring away now.

all i have to say is that the microtech diagrams are useless. im thinking of documenting exactly how ive wired this for future installers using this ecu.

thanks to everyone who posted for your input. much appreciated!!

[benjamin]

im glad it worked. As that means my research is correct (for the moment)