Does anyone know if the 12 V ICS pinouts can support any power, say up to 1 amp? I'm thinking of using one of the pinouts to power my ethanol content analyzer if that circuit can support the power.

 

Well, if its a standard GATE style chipset, the output limit is probably around 20mA but seeing as its 12V its unlikely since most are 5v max. It all depends on how the output circuit is setup, its probably a transistor output. Even a standard automotive relay requires about 150-200mA to turn on usually so you'd need to use a transistor to be safe (if the ECU isn't using one already).

Which output in particular are you trying to use and what does it normally go to?

 

ICS = intercooler sprayer. I don't know what the current output capability of the ICS pin is ... I assume the ICS ouput normally triggers a relay since the water sprayer pump likely draws a fair amount of current. You could always use the ICS pin output in conjunction with a relay to power the ECA display, although not quite as clean.

As a matter of interest, why are you wanting to use the ICS output instead of regular switched ignition? Cooking up something clever like ECA display turns on/off automatically with map switching to E85 map?

 

Yeah, its probably pretty low power capacity. Nothing special being cooked up. Since I'm planning on putting the F-V converter near the ECU, I thought it would be easy to just take 12 V power off the ICS pin.

 

I use the ice relay pinout to activate my alky kit at a certain load by using tephra "spray on knock" feature. I thought the output was a ground source though. 1amp is still a lot to ask of an ecu output that we aren't certain of though.

 

There are four pins, two that are 12 V and two that are transistor relays to ground. Looking at the FSM more closely, I understand now that the 12 V pins are used to control how the ICS operates. If one of the pins is grounded, the ICS operates in manual mode. If the other is grounded, the ICS operates in auto mode. Seems likely that very little current is available at those pins. Its wierd that Mitsu chose 12 V. I would have thought that 5 V would be the norm for this kind of task.

 

Also, the triggered inputs from the ICS switch are latching. When you press the manual button it see's either 12v or ground (cant remember) but when you release the button it rests at the opposite voltage (or stays an 'open' circuit (cant remember either lol). I just know you need to pulse the input and it latches internally in the ECU. So, pulse ground to the input once, and you can turn on AUTO MODE, pulse it again, you shut off AUTO MODE.

 

If anybody needs any of the bigger pins in the ecu plugs let me know, I have a couple of those (for the IX ecu's).

 

why dont you just relay it?

 

Yeah, I'll just take some power off the fuse panel inside the cabin.

 

On SOME pinouts you can relay it but people have to use caution because a standard automotive relay still requires more power to get switched on than some pinout circuits can supply. Most chipsets control so many things, if you fry it you're gonna have a lot of things that no longer work. Transistors are the alternative to relays in most cases here since they will require almost no current draw from the ECU to supply a fair amount of current. Darlington transistors are pretty darn good for this.

 

relay the relay? :P

yeah you would only need a tiny relay - smallest possible...

but im no electronics expert - so whatever u say