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Are A31 Rb20det Ecu's Not Same As R32 Ones?

PeterT

By PeterT,
in Four Door Family & Wagoneers

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PeterT Enthusiast

PeterT

Posted
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Howdy brains. Im pissed off :P I got a power fc a while back and was not powering on at all when I tried it in an r32. I got it checked and the main 'chip' or whatever it was was bolloxed so he got one from another rb20det power fc and tested it etc, all was good.

Went to try it today in my a31 to see if it would start it, and nothing, not even trying to start. turning over, but thats it. The commander isnt lighting up at all either.

Whats going on?!

PeterT Enthusiast

PeterT

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They are not the same. I had an A31 ecu pinout.. but I cant seem to find it now. Ill post it if I find it.

You can try to re-pin the ecu connector on A31 loom. Or you can try using a R32 loom. My ceffy is using an R32 loom.

oh man, if thats true. i f**king love you.

haha i have gtr injectors on a 32 loom in a box outside

DanShirts Collaborator

DanShirts

Posted
Posted

The r32 loom wont be a perfect fit. You may have to repin the connector that goes to the lower engine harness (the one that has the aircon wiring on it). My A31 and R32 have different oil pressure senders, that may be a problem too. There might be other problems, but it shouldnt be difficult.

PeterT Enthusiast

PeterT

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f**k i hate when things dont go to plan :P yep its an original det model, and its a 1990. I went to plug in the ecu, fitted perfect etc, just didnt do anything at all. fc commander didnt light up which has me worried :P

VRdrift Collaborator

VRdrift

Posted
Posted
Late model A31/C33 use the same harness, ECU, connectors, AFM, etc as R32 (and yet uses the same connections on the inside to link with the dash, air con, wipers, etc).

I think 90 or 91 onwards

you sure about that? My a31 is a 91 facelift, the engine conversion I got was from a facelift R32, I used the original RB20de a31 loom on the r32 Rb20T because the dash plugs were completely different, thats also using a factory R32 ECU on that loom, no probs

Nic_A31 Grand Master

Nic_A31

Posted
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That's what I meant. The dash plugs are Cefiro/Laurel specific (which are the same plugs from 88 - 94) but the rest differs.

My late model Laurel uses R32 plugs (AFM, ignition, etc), but dash plugs connected right up to my 89 Cefiro body loom.

Might be later that the engine bay / ECU plugs changed ?

My other Ceffy used its original DE loom and DE shit like crank angle sensor, afm, ignition, and a DET Cefiro ECU, to run an R32 DET motor.

VRdrift Collaborator

VRdrift

Posted
Posted
That's what I meant. The dash plugs are Cefiro/Laurel specific (which are the same plugs from 88 - 94) but the rest differs.

My late model Laurel uses R32 plugs (AFM, ignition, etc), but dash plugs connected right up to my 89 Cefiro body loom.

Might be later that the engine bay / ECU plugs changed ?

My other Ceffy used its original DE loom and DE shit like crank angle sensor, afm, ignition, and a DET Cefiro ECU, to run an R32 DET motor.

I think so, I vaguely remember writing something up on it on D1NZ forums, (my username on there is 'driftrich') I think I had a similar issue in NZ fitting a 88 R32 rb20det into a 92 cefiro

that prick of an engine had all square plugs

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