Triggering COR from FPC output of newer ECUs

[takai]

Ok, im creating this thread from Wilbo's diagram which he posted up in a few other threads. None of this information is mine, its all from Wilbo, give him the credit.

Mainly posting it because it got buried and was hard to find without specific search terms not in acronyms. So here goes: Fuel pump controller fpc cor circuit opening relay ecu modern trigger square wave output circuit.

And also, i was wondering if someone could point me in the right direction for a replacement N-Channel MOSFET, as i cant seem to find any of the FDC6561ANs as specified in the circuit in anything other than Super SOT6 packaging (dual MOSFET on a single chip with only SMD pins). SOT-223 doesnt seem to be made anymore.



Also to clarify the writing, the diode is 16V not 16kV i assume.

Any suggestions?

[wilbo666]

Thanks for passing along the credit

Almost any N channel mosfet should work, just make sure it can take the current of the relay coil I only used the one written on the circuit as that is what I had, and it also fitted on the little veroboard circuit that I made to go inside my COR.

2N7000 from jaycar should be easy to get, and should work fine as a glance.
http://www.jaycar.com.au/productView...T&SUBCATID=475

Yeah the Zener diode is 16V, it's there to protect the Mosfet gate from any zaps / alternator overvolts etc.

Circuit goes 1k series resistor, two 470n caps in parallel to gnd, 1meg resistor to gnd, 16V zener diode to gnd, mosfet gate

Also don't forget that you need to connect the DI pin to +B or ignition to get the FPC pin to pulse!

Hope it works for you.

Cheers
Wilbo

[takai]

Cool, thanks for that wilbo. Hopefully this will make it easier for other people to find. Ill update the diagram when i get a chance too, i didnt realise it was two 470n caps to gnd.

Thanks again

[wilbo666]

Takai, below should be a bit clearer!




The Toyota diagram for reference:


Cheers
Wilbo

[takai]

Sweet, thats great. Thanks

[timbosaurus]

Interesting, do u know what frequency the output is? I assume the rc filter is there to keep the fet on, as relays don't particularly like fast switching

[takai]

Here is my unsoldered veroboard.

Anyone care to confirm that its ok?

[takai]

Just to update this slightly.

On some ECUs you dont need to apply power to the DI pin, as there isnt a DI pin. Without the DI pin the FPC will still function as per normal, and this little circuit will close the COR and run your fuel pump....

[Shakotan_Aaron]

Takai, below should be a bit clearer!

I have pretty much no idea what is going on here.

anyone one give a 'Triggering COR from FPC output of newer ECUs' for dummies?

[wilbo666]

I have pretty much no idea what is going on here.

anyone one give a 'Triggering COR from FPC output of newer ECUs' for dummies?

Resistor R1 and Capacitor C1 are a RC Circuit, which act as a "Low Pass Filter". What this does is take the Pulse Width Modulated fuel pump control signal from the engine ECU and conditions it so that it is an "On/Off" signal used to drive the MOSFET transistor (switch) Q1 which turns the fuel pump relay On/Off.

An example of a PWM waveform and an RC Filter circuit output voltage waveforms - stolen from the internets.
http://www.pic24.ru/lib/exe/fetch.ph...no_pwm1_en.png

Resistor R2 is used to make sure the transistor Q1 turns off when the engine ECU fuel pump control PWM signal stops.

Zener diode D1 is used to protect the transistor Q1 from a voltage overspike or alternator fault that could damage the transistor Q1.

Transistor Q1 is used to turn the fuel pump relay On and hence turn the fuel pump On.

If the engine ECU is sending out the fuel pump control PWM signal then the transistor is ON, if the engine ECU is not sending out the fuel pump control PWM signal then the transistor should be OFF and the fuel pump should be off.

Short story:
Engine ECU -> PWM waveform (0-5V On/Off frequency signal) -> Circuit to detect PWM voltage waveform and generate an On/Off signal to control the fuel pump relay.l.




Also as I've said previously on some engine ECUs you need to connect the engine ECU 'DI' pin to switched ignition voltage to get the engine ECU to output the fuel pump control PWM signal

Cheers
Wilbo

[Shakotan_Aaron]

i printed out that page and went to jaycar. guy didnt really know what was going on and said they only had some of the parts there but not all of them.

[wilbo666]

i printed out that page and went to jaycar. guy didnt really know what was going on and said they only had some of the parts there but not all of them.

The person you spoke to at jaycar is an idiot? lol

R1 1kΩ Resistor: http://www.jaycar.com.au/productView.asp?ID=RR0572
C1 1uF Capacitor: http://www.jaycar.com.au/productView.asp?ID=RZ6627
R2 1MΩ Resistor: http://www.jaycar.com.au/productView.asp?ID=RR0644
D1 Zener Diode: http://www.jaycar.com.au/productView.asp?ID=ZR1416
Q1 MOSFET Transistor: http://www.jaycar.com.au/productView.asp?ID=ZT2400



And you prbly want some of this to make it on like Takai did...
http://www.jaycar.com.au/productView.asp?ID=HP9540

See, easy!

I'll assume you can find a relay

Cheers
Wilbo

[George]

Nice topic, saved for future reference, thanks heaps for the idea!

[auto351]

Good work Willbo.

We just completed this and used the KG9142 PCB to save us making our own board, this was the only one they has at the time, its in and working but we are looking at the other two boards as replacements (due to quality) , the IR board KG9086 is most like the one with a few modes, Will post up once we have completed


PLEASE SEE POST 17 for FINAL BUILD ( use the 2 listed below)

Relay inuse (with mod) NOW REMOVED
12VDC Relay Card Kit B197 - Jaycar Electronics

Relay Drive Isolated drive NOW IN SERVICE
Jaycar Electronics - Search results KC 5434


IR remote PCB NOT USED
Infrared Detector - Jaycar Electronics

[Shakotan_Aaron]

hhmm,

http://www.jaycar.com.au/productView.asp?ID=KG9142

This kit will close a relay's contacts with as little as 5mA to trigger the circuit. Literately any kit you see on these pages that uses an LED as a trip-condition indicator, can be used with this nifty project. Use the relay to sound buzzers, switch on lights, operate solenoids, trigger alarms, etc. Kit includes Kwik Kit PCB, relay plus electronic components.

maybe this relay could actually be used inplace of the signal converter/board?