2.0L engine or
Lancer Evolution turbo>?
which engine is there exactly to work on any engine know what it there first of fail hard you will, parts, and the manual must match.
and then get WRONG ANSWER AND ADVICE. !!!!
all fuses good !
want to stop GUE$$ing and going broke??? and do real tests?
or have shop do it? (they ASE shops do the tests)
No told at all failing RPM hot and cold and if ECT sensor is at 180f to 200f HOT, must be,or it will a fail, I promise you.
learn to read what is there next.
IAC , is what controls all idle speeds at all times. (usually as PCM controls) and yes they stick or leak air (vacuum leaks)
other DTC errors not told is a travesty to you, omg we need them all, all matter, gee misfire causes RPM idle to fail.
learn that the PCM is not "elon musk" (love him) smart
, not by 1000 miles close it is just a silly small processor. and dummmmb firmware logic(programming)
so when it sees RPM hot or cold failing it blames the IAC<
and is dead wrong 1/2 or more of the time.
507 is USA federal basic DTC standard code.
then 2.0L base use THROTTLE by wire (TPS + motor)
and when swapped must be use relearn mode, so now you know why simple parts swaps fail not reading the service manual
the TB (mfi) motor drive has a relay by the same name so relays can fail too.
so can all vacuum leaks (vast places) and huge test list (ask)
engine running lean, (bad MAF) (or bad MAP ) sensors
the PCU can correct for lean or too rich but if it gets too bad
the IAC cannot correct the gross errors , via TV or IAC
learn that ALL DTC matter to any tech not just 1 of many ever.
that is a fact. (and not told at all) sadly.
The TBW systems do in fact cause old Federal p0507 to kinda lie
507 is a federal 1996 code, DTC, and TBW was not invented yet./
so the PCM will lie to you that IAC fails even if there is NO IAC at all
as most TBW system do not need a IAC valve ever.
the throttle does all that NOW>
the motor on the throttle has huge command authority here.
if if even works at all.
Throttle BY WIRE is what that is called, and has TPS even 2 TPS in the assembly TB (throttle body) and must be calibrated, called learn mode.
there is no throttle cable on TBW cars, it is only a 5vdc variable resistor there. most cars now are all like this.
in the old days days we had
idle air valve electric, and IAC thermal only idle air valve, or both
hen we got rid of the silly IAC thermal coolant valve and went to more power ISC electric valves for cold and hot engines
the TBW happened all most cars now all the above are gond.
and a powerful TB TBW motor runs the TV valve, and does it all by magic and PCM full control at all times or you right foot demands
now a list of idle problems TBW
1: all fuse good
2: no TBW wire DTC errors of any kind. using real scan tools.
3: no vacuum leaks, that TBW can not correct for.
3: TBW not bad or forgot to do the learn mode. wow you did?
4: gross misfire, P03xx code error so bad RPM falls like a rock and TBW can not correct such a gross condition)
5: egr failures, (as in stuck open , rpm falls like rock fail or stalls
6: other sensor dead, or 1/2 dead. intermittant etc.
7: ignoring other DTC is dead wrong so I stop here.
rule #1 to any savvy tech is
fix idle last.
all else must be good or the idle controls will fail
on any car gasoline