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Help Apexi Pfc Issues

BOOSTD

By BOOSTD,
in Engines & Forced Induction

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BOOSTD Mentor

BOOSTD

Posted
Posted

I have just received a new PFC from negun. I plug it in and the hanset flickers freezes onthe startup screen. I have found that the ECCS and Ignition relays beside the ECU are not being energised. ie no earth being sent from the ECU.

Q. Do I have a faulty ECU ?

Q. Has someone seen this fault before ?

I can bypass the relays and the car runs fine, but, I shouldn't have to do that I would expect.

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https://www.sau.com.au/forums/topic/97951-help-apexi-pfc-issues/
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BHDave Grand Master

BHDave

Posted
Posted

have you confirmed that the ecu isn't sending the eccs trigger signal.

And confirmed that the ecu is getting the ignition on and cranking signal? If it is getting the ignition signal then i suspect it is a faulty pfc.

If it isn't then time to look at why.

BOOSTD Mentor

BOOSTD

Posted
  • Author
Posted

Yep, no earth to either relay. runs fine when i energise them manually. I have search the forums and found a few people with similar issues relating to voltage drop from the fuse box to the ECU,as the PFC draws more current. I will have to check which wires do what on the PWR side of things tomorrow.

BOOSTD Mentor

BOOSTD

Posted
  • Author
Posted

I've just repaired my PFC.

The problem was a 10 pin SIP (NEC PPA1478h) which leads to ECU pin 16 (GTR, relay output) This chip is obsolete and can only be purchased in lots of 500+. You will be happy to know there is one inside a stock RB25 ECU which I changed out and all now is sweet.

Another point of interest is that the PFC Saves its data from signals off this wire, so when I had bypassed this output to manually energise my ECCS and Ingition relays, the PFC would not save data.

Matt

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