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Power Fc Not Memorizing Map

2BNVS

By 2BNVS,
in Engines & Forced Induction

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2BNVS Veteran

2BNVS

Posted
Posted

i know its been covered before because ive read it but i cant find the bloody thing,

ive got a power fc which was bought with a motor, it was all good in the other car, but as soon as we put the motor in my car, tuned it when we turned the car off and back on it wasnt memorizing the new settings, just went back to a base map..

like i said i know its been covered before but what could be some solutions, is it somethin to do with my loom? pwoer cable?

any info would be great

ben...

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https://www.sau.com.au/forums/topic/88993-power-fc-not-memorizing-map/
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PurpleR32 Experienced

PurpleR32

Posted
Posted
nah its not locked, but yes my mechanic tunes alot of power fc's which is why it has him stumped, does the ecu need more power when the car is off or something?

ben...

I think INASNT on here had the exact same problem. It was to do with faulty wiring. Not sure if it was faulty wiring going to the FC or the wiring in the car its self. PM him

MacGuyver Mentor

MacGuyver

Posted
Posted

It's not an old Power FC is it? I remember reading on these forums that older Power FC's use a small battery to store the settings in it's memory, kind of like a computer's motherboard stores it's BIOS settings. Could this be the case?

"Games don't affect people. If Pacman affected us as kids, we'd all be running around in darkened rooms munching on pills and listening to repetitive music."

yogi000 Mentor

yogi000

Posted
Posted

i remember reading a post on this forum about the same problem and the solution was the the alarm or something to do with it.

Apparently the pfc needs power for a few seconds after the car is switched off to save its settings.

Thats all i can remember reading about that problem.

BHDave Grand Master

BHDave

Posted
Posted

You need to make sure the eccs relays are wired in correctly as well as the ignition switch signal to the ecu.

The ecu triggers the eccs relay to power up everything when it receives the ignition switch on signal. It also maintains power to the ecu for a second or so after the ignition is switched off which is when the pfc writes everything to memory.

Risking Grand Master

Risking

Posted
Posted

BHdave is correct, we spent some time fixing my car a while back

The ECCS relay is powered by the ECU, and must be turned off about 2-3 seconds after the igition to allow the FC to store the tune.

The Ignition switch powers up the ECU, The ECU now powers up the ECCS relay which in turn powers up the ECU completely and the coils, ignitor, injectors etc etc.

The problem seems to lie either with the wiring from the ECU to the ECCS or with the ECU itself.

Now Instead of tracing a potentially massive wiring issue it is simpler to make a switch circuit and wire it into the loom.

Using a capacitor, relay and diode you can make a circuit that will hold power to the ECU for about 4 seconds.

Basicly you need to wire up the condenser so that when you remove ignition it is powering up the relay which is spliced into the main ECCS feed to the ECU.

I have used this method on several vehicles with a 100% sucess rate.

williamsf1 Mentor

williamsf1

Posted
Posted

I had this same thing happen to my first FC

thanks to good old mohammad from these very forums, at very short notice of finding out the current FC was doing this, I rang him as he had told me he had heaps of parts.... anyhow 30mins later he rocks up to the workshop with a FC for the GTR!!! amazing! faster than a pizza!

plugged in the new FC and bingo all ok....

basically I was told by BEL that these problems are a known fault with the FC and that Apexi know about it...

I then rang the guy i bought it from originally... and he had to send it away to get looked at and repaired...(SAU trader also...but not as user friendly as Mo :) )

well that was 4 months ago!!!!

and no sign of my FC!

once I get it back and it is factory repaired I will test it and then sell it....

so yes it is a fault that apexi know about....

ring BEL for some contact info for apexi....

viking Collaborator

viking

Posted
Posted

williamsf1 - is yours the newer version ? if apexi know about it perhaps they would replace under warranty ( useless if its a design fault ) but then again power fc's been around for god knows . unfortunately i have the old one ( no warrantys there )

symtoms of my one are- (second hand unit 10-15 yo? )

when you turn the key to acc the relays in the kick panel behind ecu would tick like crazy (sumtimes)

relays in the boot would tick like crazy (sumtimes)

replace power fc with standard ecu and problem solved

end result i hav purchased power fc d-jetro

2BNVS Veteran

2BNVS

Posted
  • Author
Posted

Risking: good info thanks for than

just a note, a while ago i bought a power fc which made it do the same thing, and apparently that was the older one so i bought another new one which fixed it,

only thing that had me thinkin it wasnt the ecu itself is the fact that it worked in another car so it must be my car's wiring thats all over the shop

ben...

williamsf1 Mentor

williamsf1

Posted
Posted

well my current FC kills instantly...

I have it on good authority that this is a comman fault that is described above.... just contact apexi here in OZ or if you cant call BEL garage as they know of the problem...

Im still waiting to get my first unit back!!!

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