wiring / ecu experts on supra's and soarers needed within

[wilbo666]

To me it sounds like the Power FC is providing an switched GND to turn a COR (Circuit Open Relay) On, which won't work in a Toyota system that uses a Fuel Pump ECU

The Fuel Pump ECU expects a 0-5V PWM (Pulse Width Modulated) signal, but straight +5V will work to turn it on (0V = OFF, +5V = ON)

You have a few options as I see it

1) Replace the Fuel Pump ECU with a relay and have it triggered by the power FCs switched GND output...

2) Use a relay or PNP transistor to send a +5V signal (could tap into the TPS or MAP sensor power supply wires for +5V) to the Fuel Pump ECU when the Power FCs output is GND.



Either of the two above options should mean that if the engine stalls the fuel pump turns off

Cheers
Wilbo

[skin]

how come as soon as you touch the throttle the pumps kick back in for a few seconds? does that still support your theory?

[Sciflyer]

, so the best way to fix this is a perminent bridge in the diagnostic plug between +b and fp?

NO

That is a temporary link for fault-finding only, it is not meant to be used as a "fix"

1) On cars with fuel pump ECUs the factory pumps are not designed to run on full voltage constantly - they will die if you run them on 12-14v all the time

2) The factory setup will kill power to the pump in the event of an accident, or engine stall, or malfunction, determined by a number of triggers. If you link FP and B+ these failsafes are bypassed and the pumps will continue to run as long as the ignition switch is on, which can be very dangerous!

[skin]

so if i do what wilbo said it will fix lol?

[wilbo666]

NO

That is a temporary link for fault-finding only, it is not meant to be used as a "fix"

1) On cars with fuel pump ECUs the factory pumps are not designed to run on full voltage constantly - they will die if you run them on 12-14v all the time

2) The factory setup will kill power to the pump in the event of an accident, or engine stall, or malfunction, determined by a number of triggers. If you link FP and B+ these failsafes are bypassed and the pumps will continue to run as long as the ignition switch is on, which can be very dangerous!

I disagree with point 1, but I strongly agree with point 2!

Cheers
Wilbo

[Z2TT]

Just use a Tachometric Relay to run the pump.

[skin]

all my wiring is done i dont want to have to run new circuits to make them work, it the ecu put out the out put like it should i wouldnt have this problem lol

Quesion is,

is there another negative trigger like the fc trigger that i can bridge to trigger the circuit opening relay?

[wilbo666]

all my wiring is done i dont want to have to run new circuits to make them work, it the ecu put out the out put like it should i wouldnt have this problem lol

You could cry about it, or you could fix it

is there another negative trigger like the fc trigger that i can bridge to trigger the circuit opening relay?

JZZ30 doesn't have a Circuit Opening Relay (COR), you have a Fuel Pump Control Module (FPCM).

The COR takes a negative 'trigger signal' as you call it to turn on, however the FPCM takes a +5V signal to turn on.

It would pay to check on the Power FC to JZA70 1JZ Engine ECU adapter loom which pin the JZA70 1JZ 'Fc' (Pin to control the COR) goes back to... I'm taking a guess that it is the JZZ30 'FPC' pin...!

If my guess is wrong you'll need to modify the below diagram to use the correct 'Fc' pin to trigger the relay that sends the signal to the FPCM.

Anyway here is a suggest plan of attack for you...



Cheers
Wilbo

[skin]

shit sorry man my car is jzx81 mark2, so it does use a circuit opening realay, same as a jza70, which is what the power fc is for.

Would be easier for me if i could find a decent jzx81 wiring diagram lol

[wilbo666]

shit sorry man my car is jzx81 mark2, so it does use a circuit opening realay, same as a jza70, which is what the power fc is for.

In that case it should be even easier for you. The Power FC will I suspect be sending out +5V on the FPC pin, check this (see diagram above for pinout).

If that's the case and there is +5V being sent out on the FPC pin then you can simply use an NPN transistor (throw say a 1k resistor in series with the 'Base' pin) to turn the +5V Power FC signal into a ground triggered signal that your OCR needs


I wonder if Apexi have another pin they use to generate a COR suitable output or if it's a software only config setup... hmm anyway...

Cheers
Wilbo

[skin]

if i knew how to + rep i would thanks mate ill have a play around and see how i go

[skin]

[wilbo666]

More like this....





Cheers
Wilbo

[skin]

righto thanks

[JZA70R_92]

willbo LOVE YOUR FREAKING WIKI!!

quick double check.....Ive just installed and repinned my JZA70 loom to suit a manual JZX90 ecu and plugs so all I do is make up that circuit(peice of piss) and output of the transistor leg C to the orignal jza70 FP wire correct....