No fuel or spark, needing help big time guys

[p5150]

well the C1 connector is different than the diagnostic connector. I know that on one of the pages it calls the diagnostic connector "C1" as a reference but the actual C1 connector is next to the strut tower. If you do not have power to your B+ on your diagnostic port this is the next thing up the circuit. You need to check for power on it.

 

[Bigzavs]

Ok - so that means that the B+ circuit is not getting power. That wire is connected directly to the EFI relay. There are other components on that wire as well like the o2 sensor, vsv, ISC valve

Look at connector C1 on this page: http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=26

what do i need to look at on it? i checked with my test light and the top right and left pins on the fusebox side of C1 have power, but the middle top and the bottom 2 pins do not have power coming out of them

 

[p5150]

And the injectors are on a different circuit so dont worry about those. They are powered directly off the ignition switch.

 

[Bigzavs]

ok, so the injectors will have power with the key on, but wont fire without the ecu working. that answers one thing i was wondering about

 

[p5150]

http://www.supras.nl/index.php?option=com_content&task=view&id=34&Itemid=50

OK we are making progress. I assume that you have power at pins 1 and 4 on connector C1. The link above explains their purpose.

If you have power at pins 1 and 4 but do not have power (DONT FORGET TO PLUG C1 BACK TOGETHER FIRST) at check connector B+, o2 sensor pin #2, or at the ECU (all are on the same circuit) then you have a wiring issue. I think that pin 4 should be one running to your ECU. Perhaps the power supply got intercepted somewhere and used for something else or the wire is broken.

 

[tissimo]

Since you dont have a volt meter to check the voltage of M-rel its hard to know if its outputting a voltage to main relay. Does the test light have a bulb or a LED?

IF LED, then you could try to jump power from Batt to M-Rel (cut going to ecu first) to jump the main relay on and power +b and +b1.. IF that is the problem, then the problem is with the ECU. I'm not sure the effects jumping this would have on it as there is something messed up internally. It might work fine, or it might fry it.. so try it if you're brave... (you can disconnect ecu and try so you dont burn up the ecu if something is wrong)

How was your alternator wired? I'm not sure how Dr. Tweak did the wiring on your C1 connector. On my buddys car I crammed the alternator and EFI wires into the C1 connector and rearranged the order as I saw fit. So Stock 7m locations MIGHT not be correct. Its hard to say what was done with the C1.


IMO everything points the the ECU as the culprit

 

[p5150]

I think we may have sent him into overload

 

[p5150]

Hey man sorry I cant help more but I have to go to bed - like I said earlier you can follow that circuit on http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=49 as pins 12 and 13 coming out of the ECU. Follow the wire all the way back to the EFI relay and right before you get there you see C1.

Check all of the other feeds off of the same circuit and look for where the wire connection is broken or re-routed.

If you rig it up another way like just running another 12v source into it your other parts that run on that circuit may not work right unless you are sure they have power.

 

[tissimo]

Yea I'm heading to bed as well.. Hit me up on aim tomorrow when I'm on.. will be on/off have to back and get things ready for my vacation.. might not check this board much

 

[Bigzavs]

lol, sorry guys my browser locked up, according to that pic of C1 i dont have a wire where number 4 is, and im only getting power to 1 and 3 of it. Dr Tweak must have it right because of it running earlier with me only touching the wiring for the resistor pack wiring, and it ran on that, im gonna call a local guy and see if i can use his spare 1J ecu (really shoulda kept my stock one) if it is the ecu ill be pissed cuz its a mines ecu, but i guess ill just send it to aaron if that comes up, thanks again for the help guys, ill keep updating as i go along if i find anything else

 

[Bigzavs]

also my test light is a bulb(194 i believe) and thanks for the help so far guys

 

[Bigzavs]

well ive possibly got a stock ecu coming over tonight, so well see how that goes

 

[p5150]

if B1 and B on the harness end that plugs into the ECU do NOT have power then the ECU change isnt going to help you.

If they do have power then it is an ECU issue.

If they still do NOT have power as illustrated on the first page, you need to figure out where the break in the circuit is. To do that you will need a continuity tester - a function built into most multimeters. You can get a multimeter at harbor freight tools for cheap.

 

[Bigzavs]

whats the easiest way to check that? just taking the harness off?

 

[Freshmaker]

Have you checked the 7.5A fuse by the driver side kick panel?

 

[Bigzavs]

yup, its fine

ive checked all the fuses inside and in the fuse box in the engine bay

 

[Freshmaker]

Turn the key one and check for power at each fuse. Ninja edit... I meant to say each ECU fuse. The one under the dash and the one under the hood.

Hint: You can touch the little piece of metal on the outside of a fuse

Or I could drive a couple hours out there and fix it for you, I work for parts

 

[p5150]

whats the easiest way to check that? just taking the harness off?

Yeah - take the harness off of the ECU and check the pins for b and b1. Isnt that how you determined if it had power or not on the first page?

If you still dont have power at B+ on the check connector than you probably dont have any there either. It is the same circuit.

 

[p5150]

lol, sorry guys my browser locked up, according to that pic of C1 i dont have a wire where number 4 is, and im only getting power to 1 and 3 of it. Dr Tweak must have it right because of it running earlier with me only touching the wiring for the resistor pack wiring, and it ran on that, im gonna call a local guy and see if i can use his spare 1J ecu (really shoulda kept my stock one) if it is the ecu ill be pissed cuz its a mines ecu, but i guess ill just send it to aaron if that comes up, thanks again for the help guys, ill keep updating as i go along if i find anything else

Maybe the 88 harness doesnt have that wire for number 4 - perhaps you need to find that wire and where the break in the connection is. It should be a black/red wire.

Dont forget to check the other components (beside the B+ on the check connector) in the list that run off of the same circuit. I listed them earlier. If none of them are getting power then the power from the EFI relay is not going anywhere due to a wiring problem.

Ultimately it sounds like you will have to trace it from the output at the EFI relay and find out where the break, cut or splice in the wire is.

 

[Bigzavs]

im gonna take the harness completely off tomorrow, im gonna unloom it and trace the wires off the ecu connector and see if anything has happened to them