No fuel or spark, needing help big time guys

[p5150]

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=47

Look at this page and see where EFI main relay comes out of pin #2. See how it is black/red? Now that wire should go into the C1 connector just like you have probably been looking at.

Follow that wire to each point down the line in BOTH directions and test it for current. See how it splits in both directions (up and down on the page)?

One end of the wire goes backwards to connector B1 and the circuit opening relay on pg 46 - the other end of the splice goes to the fuel pressure vsv, egr vsv, isc valve, o2 sensor (pin#2), then to the check connector (B+) on page 48, and finally the B and B1 pins on the ECU.

It should remain a black and red wire from the EFI relay all the way to the ECU. Test it at all of the points on the wire diagram that I just talked about so that you dont have to pull apart the whole harness. If it works in one place and not the other look for the break in continuity in between those components.

 

[Bigzavs]

ok for the O2 sensor is that pin #2 on the C1 connector? cuz i have power on the female side of the connector for that pin.

now i just gotta get a multi-meter to test for the continuity(and someone who knows how to use it)

 

[p5150]

ok for the O2 sensor is that pin #2 on the C1 connector? cuz i have power on the female side of the connector for that pin.

now i just gotta get a multi-meter to test for the continuity(and someone who knows how to use it)

The O2 sensor plug is next to the o2 sensor....

If C1 is disconnected, you WONT have power on the other side because it is disconnected.

When testing for power on all of those other parts you have to keep c1 connected. Does that make sense?

 

[p5150]

Did you look at the wire diagram? And do you have power on the black/red wire?

 

[Bigzavs]

ok, on my C1 the black/red wire is pin #6 and i have no power there with the key turned on

 

[Bigzavs]

ok i set up a hotwire coming off my spare optima going straight into the black/red wire right as it comes out of the connector underneath the fusebox under the main relay, i had power at the C1 connector, where i previously didnt, i also had power at the B+ on the diagnostic port, and i had power all the way back to the ecu, but i still have no spark whatsoever or fuel

im really stumped, but jon(gotturbos?) is over and he has a multi-meter and were gonna check some stuff, if we cant figure it out, it goes to a supra shop in denton on monday

 

[Freshmaker]

Have you checked for power at the ECU fuse under the hood like I asked?

If you have power at the fuse, Take out your under the hood fuse box and main relay. Touch one lead to the connector and a jumper wire to your ECU:
Check for ground at white/black. Check for continuity between Black/orange and M-rel at the ECU. Check continuity between Black/red and B+ at ECU. Check continuity between Black/yellow and Batt at ECU.

 

[Bigzavs]

i have power at the efi fuse, im not getting power out of the main relay tho. we checked it about 5 times.

im just taking it up to a shop in denton on monday (friend and local supra guy owns the shop, cool guy) and have them fix it, im tired of working on it right now, id rather just drive it

thanks for all the help tho guys, it saved me a job of taking the harness off.........again, i appreciate it a ton. when i get the car back ill post up what the problem with the car was

 

[p5150]

if you arent getting power to the main relay at all then you need to take the box off and open it up. Check the wire going into the relay and it should go back to the battery.

 

[Bigzavs]

ok well today was the first day we fooled with it at the shop, took less than a half hour for the guy to find some stuff and fix it, he said the ecu wasnt switching on the main relay(or something along those lines) and he bypassed the circuit and got it to switch on and all the power came back to the ecu without having to hot wire it. but the car still wont fire, im getting fuel to the rail, and im getting signals from the crank sensor and the cam sensors, but im not sparking and the injectors arent pulsing

from what he said its most likely the ecu has just taken a dump on me completely. im gonna contact aaron at driftmotion and see if its possible to get it fixed. im gonna try to get one of the guys to test it out on a friends 1J tomorrow afternoon

one other question, the last time i tested it on a car, his car started up but died a few seconds later, he has 680cc injectors on his car and my mines is tuned for the stock 370's, would his car flood out and kill itself with that much fuel difference or does this mean the ecu is still messed up?

thanks again guys

 

[p5150]

If he has 680s and yours are 370cc then it would dump almost twice as much fuel per injection. So yes, it would run rich.

I would check all my wires before I bought a new ECU. If one of those was wrong then maybe you have some others mixed up.

 

[Bigzavs]

If he has 680s and yours are 370cc then it would dump almost twice as much fuel per injection. So yes, it would run rich.

I would check all my wires before I bought a new ECU. If one of those was wrong then maybe you have some others mixed up.

but would it run so rich it would kill the motor? cuz we got his car to start on the ecu but it died out, and he guessed it was from flooding.

and no wires were swapped around from when it was running to when it stopped running.

he also did say one thing, something about my ignition power being constantly on and that it may have contributed to the ecu going out or something like that. i dont remember exactly what he said tho. ill call and ask him in the morning

 

[Bigzavs]

ok i tested my ecu out on my friends 1J and it started his right up, so im starting to guess its in my wiring harness somewhere.

 

[p5150]

told ya

 

[JonoTurbo]

ok i tested my ecu out on my friends 1J and it started his right up, so im starting to guess its in my wiring harness somewhere.

Just so you know, I did the exact same thing when my car wasn't starting. Took my ECU and put it in a friends car and it started up and ran for 20 minutes before we shut it off. In my car it wouldn't run for even 1 minute. ECU still turned out to be the problem.

Just saying, don't rule it out.

 

[Bigzavs]

ive got another mines vx-rom on its way here, should be here in a few days

monday were pulling the harness off and were gonna check it for any breaks or fried wires. hopefully ill be able to crank the ho before the weekend, i hope