ok the deal is my ecu was toasted apparently, the parts in the engine bay that connect to the brown/white wire (2A on the emission harness of the ecu) must have or had a short in it... i want to test and make sure that when i plug another one up its not gonna fry it also... how do i test for resistance? do i ohm out the wires from one harness to pin 2A? i just want to find what was grounded or is grounded and fix this prob. thanks in advance

christopher

 

make sure all power is off to check resistance...different sensors/ switches are gonna have different test parameters, i.e. resistance might be in a specific range (say, 20 ohms) for one sensor and for another might be zero and infinity (a switch). coils in solenoids and relays have very little resistance when checked w/ the 9-volt power source in most multimeters...what I'm getting at is you need to consult the FSM or Haynes for each component in the circuit you're gonna check...don't assume just because you read 1.5 ohms or less (to ground) you've got a short, although it could be . you can either isolate the entire circuit you're reading (disconnect the sensor and ECU plugs and probe the terminals of the harness), or you can read out the harness/ sensor/relay/etc from the ECU, as long as you know what you should be reading (compared to what you're actually reading). hunting for a short can be a PITA...is there anything you did to the car before the problems started?

 

no i put in clutch fluid to see if that was my clutch problem and it was... i then killed it too soon and flooded it then this happened. i havent done any wiring or nothin on my car... thats what confuses me

 

hey,ya know your just a couple tens of miles up 59 from me (coldspring). I think we had a magnetic disturbance over east Texas recently, cause mine flooded too last week, first time in a long time its done that! Mine was a bitch to get unflooded that time,too, took me all day, finally had to inject some oil into the spark plug holes & keep pulling & drying the plugs every attempt. just keep at it, helps if you've got another battery or another car jumped with yours...

 

lol your prolly right wayne, its the fucked up ozone layer causing this ****, im tryin to just get spark (i have a spark plug tester hooked up not using just a spark plug) once i get a good ecu hopefully it will work and spark will happen, im in houston some man we should meet up.. know of any events and **** goin on? it sucks here in a small town cause nobody appreciates rx7's much less know what they are

 

now tell me again why you think the ECU is bad...or what you did to fry it...also, when its flooded, it'll act like its getting no spark...

 

well man i have a spark plug tester hooked up to it (the one from autozone that shows the gap and how far the electrons jump) and it does not have a spark, everything tests fine (CAS, coils, distributors) the only thing that is bad is the brown white wire to all the sensors which only recieves a measly .23 volts on average, i tested the brown/white wire on my buddies rx7 and its getting 5.3 so i know im testing it right. takin the ecu out it has a lot of water corrosion damage to it (damn conv leaks) and corrosion ate one wire clean thru so i have to rehook it up. anyhow all the sensors are getting a shitty voltage and normaly the ecu is at fault so i ordered another one from kevin landers. i dont want to hook it up and toast this one as well..... when i didnt know it wasnt getting spark i towed the damn thing up and down the street trying to pop the clutch with no luck and it should have been easy cause ive done it in many other cars. thats when i knew i wasnt getting spark or something, fuel tests fine, air is ok so its just spark and im hoping the ecu will fix that and just want to test the other wires to safeguard the ecu from frying cause i cannot wait another 2 weeks for another one

 

o.k., this is gonna take a while, but this is what I would do- disconnect all the sensor connectors that wire goes to, with no power on, read for a short to ground from the ECU plug (disconnected from ECU). If ya can, have someone gently move the harness around at as many points as he/she can while your looking at the meter. if you've correctly isolated the circuit you should read infinity or something damn close (megaohms & above)...that will rule out the wiring/harness as the culprit...next you can read out each individual sensor, or, if you prefer, hook up the connectors again & read the sensors out from the ECU plug ( I would do it at each individual sensor, though, that way you could do a visual inspection of the pins,etc while you're there). just remember-some things (coils come to mind) will act like they're shorting to ground when you read them with a meter- it's not until current flows through 'em they build up appreciable resistance. good luck- see if you can fix yours before I get mine running again!

 

the magenetic disturbance was the ozones way of telling us 7 owners to stop driving our very pollusive cars. :P: yea right

 

does this mean i can watch for SUV's being struck by lighting?

 

good god i hope so... i was at a stop light the other day and i hear this terrible screeching noise behind me... the car had slammed on their brakes and almost hit me (thank god they stopped even though it was only 5 inches from my car) it wouldnt have been so bad if i hadnt seen what car or whom was driving it........ A ******* H2 WITH A ******* WOMAN ON A ******* CELL PHONE...... god damn i was about to get out and bitch her out... you dont drive a tank and talk on a cell phone endagering anything and everything on the road..... anyway im gonna stop or my blood pressure will get too high