Ecu Not Lighting Up

[evoeta]

hey guys!!

wondering if anyone has had the same issue or similar and can pass on some advice, ok problem. ive gone to plug my ecu in which is a chipped ecu for my rb30det, the led on the side doesnt light up and gets no power. i have checked the power going into the ecu an the ground they are sweet as, i have put the ecu into another car and it works legit. i also got my hands on a 25det ecu and that lights up then tried a 20det and 20de ecu both dont work WTH cant figure it out can someone shed some light please?!

cheers in advance

[niZmO_Man]

That is because RB20 and RB25 ECUs are different. What head/wiring do you have?

[Simon-S14]

20/25 ecu will all plug and power up as they have near identical pin outs

[GTSBoy]

I would be looking for damaged pins on the suspect ECU - either outside in the plug or inside where they run to the PCB. Solder pads can crack, leaving no connection even if it looks solid.

The other thing to look at is just maybe (some of) the pin(s) in the back of the loom plug for power or earth might be pushed back a bit. There might be just enough variation between the length of the pins on difference ECUs for one to make contact and another to not make contact. Look inside the loom plug and/or push them all in from the back to see if one or more moves and clicks into place.

[evoeta]

rb25 an rb20 ecus have the same power in.

also i checked i checked all the pins an they sweet as, i chucked the ecu im trying to power up into my mates cef and it lights

up an runs fine. then when i go to chuck it into mine, nothing, not a sign of life. is there some sort of auxiliry power or signal power which tells it when to turn on or something? just spitballing now

[GTSBoy]

Yes, the brown relay differs between them.

[evoeta]

Brown relay? where is this located? haha

[GTSBoy]

Right under/next to the ECU.