Dirgle;1943017 said:
Yes I put a couple gallons in, I'm gonna have the blonde come out and turn it over while I listen for the pump in the morning, if I hear the pump goin then I'll get some more gas for it
Fuel Pump/No power to relay area
- Thread starter mattsplat72
- Start date
Yes I put a couple gallons in, I'm gonna have the blonde come out and turn it over while I listen for the pump in the morning, if I hear the pump goin then I'll get some more gas for it
And by jumpering B+ to FP you did this:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=71
NOT what was shown in pictures a few posts above, correct?
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=71
NOT what was shown in pictures a few posts above, correct?
jetjock;1943015 said:
Where would you suggest looking from that point? Cuz I already checked the pump and it works, so should I just do 12v from that point?
Dirgle;1943019 said:
Nope, acted like a child and looked at the pics :/ so the pics are not how to jump it?
I really do need to just read that damn thing and I could prob figure out most of my issues
The pictures were for someone who wants to bypass the relay that switches the fuel pump between 9V and 12V operation. Plug that thing back in and go over to the driver side of the car with a paper clip. Open the diagnostic connector by the fuse box and jumper the B+ and the FP, the try to start the car.
jetjock;1943024 said:
Oh the fog of my mistakes is starting to clear and show my true ignorance of such things:1zhelp:
yhatzee89;1942044 said:Is that what this is? If so, where is it located?
For the record, the default position of the fuel pump relay is 12V. All you have to do is disconnect the switching portion of the relay that would turn it to the resisitor.
All fuses are good, pump is good cuz when I pulled it I checked, +B to FP on diag plug, still no start
I did! Dirgle texted me and walked me through testing portions of the entire fuel circuit and I must have moved a loose wire because in the middle of testing we got power back to the fuel system and it runs fine now 
The first thing we checked for was for the pump to be running with +B to FP jumped and the ignition on......No running pump.
So then we tested for 12v at the +B pin in the Diag connector.......No Voltage
The next step was to check the EFI fuse and test for 12v....Good, found 12v
Next we tested the EFI main relay with the ignition turned on.... Only had power to pin 1, should be power on pin 1 and pin 4. This indicates that the ECU isn't sending the M-Rel signal.
Then we checked the 7.5amp IGN fuse.....This fuse had no power with the key on.
Followed this back to the Ignition switch connector under the steering column. Checked power on pin 8, a white wire with a red tracer......showed 12v, good.
At this point Yhatzee89 retested the IGN fuse and found power.......After seeing this he tried to start the car again and it fired right up.
It's good that the car is working but it always bothers me when things fix themselves like this without a specific solution. It usually means that the problem will reappear at some point. The only difference I can guess at is that a lot maneuvering and pulling has to be done to access the ignition switch connector to preform testing on it. This may have reseated the contacts in the connector or switch itself. Still it's just a guess, not a definitive solution and it bothers me. Either way the car is running, and thats a plus.
So then we tested for 12v at the +B pin in the Diag connector.......No Voltage
The next step was to check the EFI fuse and test for 12v....Good, found 12v
Next we tested the EFI main relay with the ignition turned on.... Only had power to pin 1, should be power on pin 1 and pin 4. This indicates that the ECU isn't sending the M-Rel signal.
Then we checked the 7.5amp IGN fuse.....This fuse had no power with the key on.
Followed this back to the Ignition switch connector under the steering column. Checked power on pin 8, a white wire with a red tracer......showed 12v, good.
At this point Yhatzee89 retested the IGN fuse and found power.......After seeing this he tried to start the car again and it fired right up.
It's good that the car is working but it always bothers me when things fix themselves like this without a specific solution. It usually means that the problem will reappear at some point. The only difference I can guess at is that a lot maneuvering and pulling has to be done to access the ignition switch connector to preform testing on it. This may have reseated the contacts in the connector or switch itself. Still it's just a guess, not a definitive solution and it bothers me. Either way the car is running, and thats a plus.
I had the same issue and the solution ended up being one of the connectors to the CircutOpeningRelay were a tad bit loose. tightened up the pin with a pick and works fine