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Microtech no spark on ltx12

Old 03-16-10, 07:01 PM
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no spark on ltx12

running a 20b with fd coils. i have power to all 6 coils but no ground pulse. i checked continuity on the ground wires to the back of the ecu and they are fine.
power stays on while cranking but no ground on other wire.

i measured resistance on CAS according to FSM and it is within spec. i did noticed how ever all 4 wires have no power goin to CAS. im under the impression that 2 should be power but arent getting any. neither key on or while cranking. on checked straight on the back of the ecu and same thing, no power to those wires.

any ideas?
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Old 03-16-10, 11:07 PM
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the CAS is passive,, it generates its own reluctor signal with movement

check the error codes for home or ref error,, methinks its not seeing the CAS well

what rpm display do you get whilst cranking?
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Old 03-17-10, 06:46 AM
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i dont have a dongle to check
how do i check for codes"
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Old 03-17-10, 04:10 PM
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Dont need to do any of that rubbish.


When you are cranking the car.

You should get a flashing ORANGE light on your ecu.
If you do then your CAS is working fine.

If you dont then you have a CAS or CAS wiring problem.

WHat FD coils are you using?

Your computer is a ltx12 direct fire ecu? How are you using FD coils?
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Old 03-19-10, 08:44 PM
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I'm sorry it must be re coils. Leading and trailing.
While cranking I'm getting a solid green, orange flashing, and red light flashing slowly.
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Old 03-19-10, 11:49 PM
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Show me a pic of your coil pack setup.

Your ecu SHOULD BE USING 6 HEC 715 COILPACKS or 6 TRAILING FC Coilpacks(with no ignitor)
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Old 03-20-10, 06:44 AM
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its coil packs with 2 wire connectors.
car ran fine before but now not starting, looks like fd ones. 3x lead, 3x trailing.

wat should i look for now?
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Old 03-21-10, 04:25 PM
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have you checked that all coils are getting 12v?
If they are getting 12v.

Then sounds like you have burnt ignitors and that means ecu needs to be sent back to aus.
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Old 03-21-10, 06:18 PM
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they are getting 12vs with key on and while cranking.
no ground pulse to any 6 coil packs, or back of ecu.
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Old 03-24-10, 06:05 PM
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i just got a dongle for it, anything in particular i should be looking for?
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Old 03-25-10, 07:31 PM
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i hooked up laptop, it shows RPM on the ecu software. so i think ecu might be fried. any other opinions
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Old 03-25-10, 07:37 PM
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Like i said if the orange light if flashing on crank on the unit it self their is a crank signal and if your still not getting spark your ignitors are dead.

i would be getting ecu repaired and getting 6 bosch hec 715 coils. Pm me i can do both.
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Old 07-04-10, 01:41 AM
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Originally Posted by rx72c View Post
Like i said if the orange light if flashing on crank on the unit it self their is a crank signal and if your still not getting spark your ignitors are dead.

i would be getting ecu repaired and getting 6 bosch hec 715 coils. Pm me i can do both.
Lucky I found this thread. Pm you rx72c
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Old 07-13-10, 01:41 PM
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I just received my Ltx12 from microtech, it was reconfigured for my 13b and I'm getting the same problem. We checked all wiring 100 times and still no orange flashing. We installed it on my friends rx7 with the same running setup I have and it didn't work. This really sucks I guess I have to send it back to AUS. Also I'm using MDS blasters

Last edited by littlez187; 07-13-10 at 01:55 PM.
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Old 07-24-10, 12:55 PM
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im using msd blasters, and i have very weak spark. on a 13b. i cant get the thing to start! i dont know if its fuel or if its ignition. i think its ignition. cause the manifold is filled with gas...
sorry to steal the thread, but ive read everythign and cant find answers.

help?
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