CStone

well i solved it. turns out the guy who made the loom had all the engine sensors, actuators etc. powered off ignition IG2 including the ISCV once I changed that so its all powered off the main relay it started working. ideally i would have only the iscv powered off the main relay but ah well, it works

sorry its been a while but I still haven't fixed this. the last thing i tried was removing the diode from the equation and im still getting 1.5 at ignition signal after key off so it must be coming from the car wiring somewhere and not feeding back through the diode. I'll attach some of the schematics from the cars manual if it helps

the pull up resistor on DI is disabled. I pulled the fuse and the voltage disappears at the ecu side and it powers down as per normal. i still have 0.6v at the ign. switch side. I tried connecting a light bulb from the red dot to ground and that helped to bleed off the excess voltage after key off so the ecu hold power was working but then the iscv wouldnt reset for some reason. i was wondering if it messed up the circuit since the iscv, ign coils etc. are all powered off that same ignition circuit but i dont know whats going on yet. i will keep prodding around and see what else i can come up with

yes thats how i have it wired and ive got 1.5v at the red dot

ok i unplugged all the aux 1 through 8 and no change.. hmm

well thats interesting cause it started happening after i wired ign 8 to the ac clutch relay. i dont quite understand how it can back feed to a different circuit but il try disconnecting it and see what happens. thanks alot

Hi, I'm having some trouble with the ecu hold power function I wired it as per the help file and it actually worked at first but then the ecu was staying on after key off. in PCLink it was showing ignition active so i checked the voltage and 1.5v was still getting back through the reverse side of the diode after key off. i swapped in another 1n4007 diode and same result. does it need to see 0v there to actually work? is there any way i can change the threshold in PCLink? are my new diodes all faulty? any help would be appreciated