Electronic Issues, need troubleshooting please

[Kamakazi Kid]

so, after working on the car for a few hours here and there after BHG and some other stuff that was taken off by the previous owner, i finally get everything to where it should start. no luck. engine wont kick at all, fuel pump primed the first few times, but probably got full and now isnt priming. checked all fuses, and harness plugs. relay's seem alright to me, but the car still wont even show signs of wanting to kick over. basically, going from "off" to "run" is no difference. all the electronic stuff i get is gauges and headlights and thats it, but that can be done without the key. so, this is where i turn to you guys for help. :1zhelp: all ideas will be looked at and tried, and any and all help is appreciated.

thanks

Jay

 

[plaaya69]

Hey Jay, Have you checked the one wire that goes to the starter? also recheck the positive wire that comes from the starter and goes to the battery.

 

[Kamakazi Kid]

Hey Jay, Have you checked the one wire that goes to the starter? also recheck the positive wire that comes from the starter and goes to the battery.

yes, i relocated the battery to the rear. so, all the battery wire was replaced. theres 1 plug that goes into the starter, and theres the wire that gets held on by a nut on the starter too. both are on, but i will double check them to make sure nothing is screwy about the plug and the connections. and, im certain the battery was rewired correctly as well. one of my friends confused the positive linkage for the ground and definatly shot out a few sparks and a cloud of smoke. lol. all fuses are fine though.

 

[johnathan1]

Wait, so you crossed your positive and negative?? If so, your ECU could be fried.

 

[Kamakazi Kid]

it did the exact same thing before my friend crossed them, so leads me to think it either it didnt do anything or it was done already. but, before any of that happened, the ecu didnt get any power at all. no relays clicked, no fp noise, no power anything.

 

[Supra87T]

you can check to see if the ecu is getting power with the key on by checking ig/sw and e1 with a voltmeter. it should be ~12V

 

[jetjock]

Just look at the CEL with the key on. Or check the Main Relay. If the MR is on IGSW is powered and the ECU is alive.

 

[Kamakazi Kid]

going out to the garage to check the previous posts right now. does anybody know if a mkii MR would work by chance?

 

[jetjock]

Nope, don't know. Unplug yours with the key one an see if it clicks. If the CEL is on it should. I warn you, just because the ECU is alive doesn't mean it hasn't be crippled. They're pretty tough though. Many of the ones I've seen are reverse polarity protected but I don't now about ours. Guess I should find that out someday. As for your starting problem do you hear the fuel pump run when you hold the key to start?

 

[Kamakazi Kid]

no fuel pump at all. my voltometer is in my dads truck... that happens to be in phoenix right now. im going to go see if my neighbor has one i can borrow for the night though. and, going back to switching them to see if they click, none of them do at all, this is where it gets me confused. but i will most definatly get ahold of a voltmeter tonight and see if i can find if e1 and igsw are getting power.

 

[jetjock]

Does the CEL come on with the key on? Do any of the dash lights come on? ABS, etc?

 

[Kamakazi Kid]

CEL doesnt come on at all. the car doesnt even read that the key is in. the only lights that come on are the headlights and boost guage (aftermarket wired to green dimmer). my guages arent hooked up to power so they dont come on because of that. when the door is open the red light showing so comes on too, and the noise goes off as well.

 

[jetjock]

Well, the schematic shows you should have a bad fusible link. Check them in the fuse box. In fact check all the fuses. Since you've screwed with the battery wiring I don't know what you have. This should be a simple problem to find though.

 

[plaaya69]

Also check the 100A alternator fuse in the engine bay fuse box, It might be blown.

 

[Kamakazi Kid]

just checked the fuses under the hood, including the 100A one and theyre all ok. also, checked the ones by the driverside kick panel and theyre all fine too. i was really hoping it would be something that easy but damn my luck. lol. neighbor wasnt home so no luck with the voltometer tonight. im going to reread the haynes schematics tomorrow on my lunch break and see if theres anything blatantly obvious that im missing.... and im hoping so. thanks for the help guys, any more suggestions are greatly appreciated.

 

[Kamakazi Kid]

i just printed out every page from the tinylinks.com electrical diagrams... needless to say, i have alot of reading to do at work. lol.

 

[Kamakazi Kid]

so far today ive checked all the relays by switching them out into my friends celica. his still works with all the relays. my main problem is that the ecu isnt even getting any power, therefore, i cant check the current going through it =,(. checked all the grounds with a voltometer and they all get 12.38 steady volts. i think next im going to rip out the ignition switch and see if it has a good contact, let alone a contact at all.

well, back to the garage.

 

[Kamakazi Kid]

so, after taking off the panels to get to the ignition i found out that the original owner had unpluged the ignition harness and then put the panels back on. i feel retarded for not checking in the first place. thanks for all the help guys, i learned alot from the diagrams and everything posted.

thanks again
Jay