tryed to roll start..did I fry ECU?

[staticpage]

my starter relay has been acting up, the relay died one day last week.
this is a JZZ30 ecu,1jz, fuel has a manual on/off switch

I tried to roll start it then ran out of hill. so I jacked up the car and jumped the starter. letting it crank for a wile it did not start, then I realized I forgot to turn the key on. So I turn the key and try some more, nothing. I check the CEL and it's not even lighting up like it use to.(to give the ecu OK flash) and none of the injectors are firing. So I let it sit for 20 mins and then the ecu comes back to life and it has been fine for three days till today I did the same thing, forgot to turn key again. now the ecu's not coming back on.
I have the idea that i fried the ecu turning the engine over with out power going to the ecu does that sound like something that could happen?
it did not smell burnt and looks fine.

help me out I miss my car already:1zhelp:

 

[87M-GTE]

Doesn't sound likely.
Your best bet is to remove the ECU and check to see if anything is burnt up in there.

 

[staticpage]

Doesn't sound likely.
Your best bet is to remove the ECU and check to see if anything is burnt up in there.

did, fond a cap that was replaced, poorly. the board under it is pulling up and the solder job is lame sauce. crossing fingers hoping i can do better.

 

[dslocal]

its possible that something went off with the alarm system too when you did that but I would bet its the ecu thing you found. Good luck

 

[staticpage]

replaced the caps in ecu still nothing, trying to find a power fc. this is my 3rd ecu I,m tired of this crap.

 

[92TealSupra]

So all your wiring is correct?

 

[staticpage]

It ran great for a month so the wireing was fine.
I am looking for the best place to buy a power fc for a jzz30.
can the alarm system immobilize the car like this or does it just stop the starter?

 

[92TealSupra]

Starter Circuit.

 

[kotu100]

ya check the alarm, do a quick bypass just to check if that the problem.

 

[92TealSupra]

There are two wires that run the actual horn, yellow/blue, and white white goes to the c1 plug next to the fuse box and yellow blur runs into the dash on the B1 plug, as I am doing my 1jz swap I am going to have it wired up.

 

[staticpage]

checked/bypassed alarm not the problem.
the ecu is fried I need a new one, i bench tested it with a power source and I could not get it to do any thing. powering it up should of allowed the ecu to check for sensors and blink out CEL's.

 

[92TealSupra]

I have a Chaser ECU from my Swap no hanress I wills hip it for 75.00

 

[staticpage]

installed new ecu 1jz is running fine now. it must of been something to do with the roll start that killed the ecu. every time my starter would not crank and I tried to roll start, it made the ecu go dead for 15mins then later I would try again and get lucky with the starter.

 

[staticpage]

same problem came back after killing it in gear. Could my patiences be running thin yes, I cant afford a new ecu every week. any ideas? bad wiring

 

[Another MkIII]

same problem came back after killing it in gear. Could my patiences be running thin yes, I cant afford a new ecu every week. any ideas? bad wiring

Possibly. At this point I would say the ECU isn't your problem, frying ECU's is just a symptom of a bigger problem. Start checking your wiring, something could be shorted and sending too much current through the ECU.
-AM3

 

[92TealSupra]

same problem came back after killing it in gear. Could my patiences be running thin yes, I cant afford a new ecu every week. any ideas? bad wiring

Check your harness maybe you have a short hurting these ecu's
:'[
I have a jza70 m/T hanress if you need one. if you need one.

 

[staticpage]

I'm going to try a new battery, my idea is that the battery is shorting out making the charging system spike in amps/volts. Some times the battery dies for no resign then takes a full day to take a charge.

This problem seems totally random (but most likely not). I drove the car to UC last night (45min drive) parked and then checked to see if it would start and got NO cel "OK" flash and no start. so i unplugged the battery, went in to university hospital 6hrs later came out pluged the battery in and was ok for the drive home. Got home turned it off and it started right back up. the only thing different was i did not have the A/C on on the way home and I had the lights on.

 

[viperkillertt]

replaced the caps in ecu still nothing, trying to find a power fc. this is my 3rd ecu I,m tired of this crap.

DAMN DUDE!!!
3!
I feel for you. I got a replacement one a year ago and it has been working great, I got new caps in her the day i got her! I did just get a AEM EMS 6860.

 

[viperkillertt]

Hey,
Check out my old thread: http://www.supramania.com/forums/showthread.php?t=98330
It sounds similar.
When it is hot and i try to restart the car quickly, it just doesn't work immediately. A few guys gave some suggestions. It doesn't happen that often to me, only when i drive the car lots. I haven't been driving much in the 90+ heat, so i haven't dealt with it much since June

 

[staticpage]

Problem solved! The signal wire from ecu to alternator was shorting out. This makes the ecu kind of "time out" after you turn off the car. I checked the other ecus I have that where part of the problem, now that they have sat on the shelf for a wile they work again.