P0505 with "super" MIVEC
 

Hey Guys,

I am using the MIVEC map that NJ has in the "How To Tune" thread.

Every now and again I am getting P0505 - Idle control or something! :(

Anyone know how to fix? reduce advance in MIVEC i spose?

Cheers
D

idle control system malfunction?

if its the same thing as my car (and a few few others), its because your idle control valve is clogged with carbon. you need to get it cleaned out

mines has doing it since about 10000 k's, long before any tuning :)

If the cleaning thing doesnt work you could lower the advance below 2000 RPM
If your idle speed has gone up then this will help that also.

I did not throw codes but did lower the cells below 2000 to stock values to fix idle issues

the car has only done 4000km's so i dont think its dirty... plus it doesn't do it on stock MIVEC!

ill try lowering the advance a little :)

Dave - how many steps do you have on idle stepper when you get the CEL p0505? I've seen this coming when for some reason the desired idle rpm was reached only when the steps to maintain the desired idle RPM were outside of the range (the base is set in one of the Desired ISCV Initial step). In order to get them match - you need to open/close the BISS screw. Then follow the learning procedure - warm up the engine, disconnect battery, connect, run on idle for cca 4-5 minutes until he idle goes through the learning cycle.

x2 that should fix it

ok i have reduced the MIVEC around the idle cell's lets see if that fixes it :)

How much is your ISC showing on idle when you get the CEL ?

55 steps normally, not sure at the moment of the CEL...

try to find in the evo9 service manual something like attached (from Evo 8 manual) - you are getting p0505 in case your steps are out of the range as stated there (of course assuming you have the stock values in the desired idle tables).

hrmm ok weird - I will log it when I get in the car but so far no CEL with the new MIVCE...

Well if all that was changed is Mivec and then 505 started showin up we can pretty safely assume Mivec map changes caused it. That said changing the values Should take care of the problem. If cam timing and base iginition timing are too far advanced that might make the ecu think idle stepper is out of range. (just a theory here)

Good Luck Tephra I think you got it m8 {thumbup}

well after warming up my car is running 27 steps.. and still no CEL... so guess its mivec related :)

Just to clarify - the super MIVEC caused that in order to maintain the desired idle RPM - the ECU opened the stepper (to 55 steps). As this value is not standard (stock) - the service manual describes some scenarios/conditions which if not fulfilled within certain period - will give this malfunction (CEL).

So yes - changing MIVEC resulted in decreased ISC steps to maintain the desired idle RPM - and now you should not get CEL (as you are close to what I think is the range for Evo9. In case you still get CEL and do not want to change MIVEC further - then you just need to open the BISS screw cca half a turn and reset ECU and go throught the idle learning procedure (cca 5 minutes of running a warm engine on idle).

ok piccy of the BISS screw? just for future reference!

thanks by the way :)