jcb <mail.jun.l@[EMAIL PROTECTED]
> wrote in
news:487c7197-3447-4de7-bbf9-daca410faaca@[EMAIL PROTECTED]
> On Jan 14, 12:57 pm, Jim Yanik <jyanik@[EMAIL PROTECTED]
> wrote:
>> jcb <mail.jun.l@[EMAIL PROTECTED]
> wrote in news:a7733402-c7c7-4fa1-9e1c-
>> 980af78b5df4@[EMAIL PROTECTED]
>>
>>
>>
>>
>>
>> > Hello experts,
>> > I ran into a weird idle speed problem on my '02 Nissan Sentra SE-R
>> > (QR25 engine, 5-speed M/T).
>> > After about an hour of hwy driving (~60mph), I noticed that the
>> > idle speed was up around 1200 rpm when I stopped at a traffic
>> > light. Shortly after got home, while the car is still at normal
>> > operation temperature, I performed the "Idle speed learning"
>> > procedure (I'm sure I did everything correctly, because I've done
>> > that before); however, at this time, instead of having the idle
>> > speed drops to ~750rpm, during the learning stage, the engine sets
>> > the idle speed up exactly at 1500rpm.
>> > I've repeated the idle speed leaning steps few times, but every
>> > time, it just sets to 1500rmp (btw, I read this number from the
>> > Scan tool and there is no MIL light on. ECU doesn't sense any
>> > error) I ran out of ideas. Any hints would be much appreciated.
>>
>> > Have a nice day
>>
>> I'm no expert....but
>>
>> I have a similar problem with my 03 SE-R SpecV.the idle increased to
>> ~1500- 2000 rpm,drifted around,and soon enough,set the MIL light with
>> an error code of P0507(too fast an idle speed).I had to go thru the
>> idle set procedure,too.
>> Eventually,the code cleared itself(MIL went out),it took quite a long
>> time,though.
>> my idle has been pretty stable recently.One thing that bothers me is
>> the long time it takes for the RPMs to drop back after I get off the
>> gas pedal.
>>
>> there's a tech bulletin out on the power steering pressure switch
>> going intermittent,causing idle problems.
>> the switch normally tells the ECU to increase the idle when the
>> steering is moved,to keep from stalling.
>>
>> this site is a big help;http://www.nissanhelp.com/
>>
>> you can download parts of the factory manual,one DL per 24hr period.
>> They list all the bulletins for each Nissan model.
>>
>> --
>> Jim Yanik
>> jyanik
>> at
>> kua.net- Hide quoted text -
>>
>> - Show quoted text -
>
> Thank you Jim for the quick reply...
> I've done some research before posting this msg, so I am aware of the
> website you mentioned. I am not sure my issue is the same as the PSP
> switch, because while idling, if I turn the steering wheel, I saw the
> idle speed changes (by dropping a bit and then jumping back to
> ~1200rpm again), which means that the ECU receives the feedback from
> the PSP switch and reacted accordingly. If the PSP switch is failed as
> the bulletin described, then it should be always "ON" and there
> shouldn't be any changes while tuning the steering wheel.
In my case,I suspect the PSP switch is sticking intermittently.
> I'm not really a mechanical savvy guy, so I'm not sure my analysis
> makes sense or not.
> I found another website saying that it could be "Idle Airflow
> Controller" problem, but I haven't checked it out yet. I'll update the
> group once I figured out what the real issue is...
>
>
I don't think our model years(2002 and newer) have an idle air
controller.I
believe it's all controlled by the electronic throttle control.That's why
you have to use a "procedure" to set the idle.
Perhaps it's just the throttle body gummed up and needs cleaning.(SWAG)
Ther's a recall on the ECU for my 03,I'm not sure if it covers your year
too,but it is something about stalling(IDLE PROB?) and involves a
reprogramming of the ECU. I may get that reprogramming done.
Maybe that would solve your problem,although I'd try cleaning the throttle
body first.
--
Jim Yanik
jyanik
at
kua.net
|
