Nissan Maxima idle preoblem when in park and neutral please help

[jofrettb]

I have a 2001 Maxima 20th aniverssary that is giving me alot of problems, the ICV went out on it so it fried the ecm, so i got a new one from the dealer, after it was programed and everything we are still having idle problems and is giving the ICV code again even after the dealer put 2nd icv on. The RPM stay at 1500 when is in park until it warms up then they jump between 1500 and 2000, and as soon as i put if in grear they go down to 1000. The dealer doest know what to do anymore so please sombody help me.

[jetroy240]

Was the ecm replaced? Idle air volume learn performed?

[jofrettb]

yes new ECM and that test was performed by a nissan master tech, but they just cant figure out what is wrong withh the car.

[jetroy240]

It could be the harness or connectors between ISC & ECM, need to check continuity , voltage signals, pin terminal check (a female terminal could be loose). Try to get a similar single male terminal like the one on ISC , disconnect the ISC connector(harness side) & slide it in each of the female terminal, tightness should be the same on all terminal. Same procedure on ECM side where the ISC wiring is. Just hard to find a single male terminal like the ECM, very skinny. Make sure battery terminals are disconnected, when doing this test. Getting the right thickness & width male test terminal is the key. Try to practice on similar terminal so that you will get familiar how tight they go in & out. Another type of a good continuity test is by using a test light & battery voltage w/ both connectors disconnected & vehicle"s battery terminals disconnected.
Modified by jetroy240 at 6:09 PM 10/25/2009

[jofrettb]

waooo that was more if than my brain can handle but i am goin to print this out and give all this a try cus at this point everything helps. Thanks alot and i will let you know what happens