Main Computer Whistles While it Works...
Thread Starter
|
Amateur
Joined: Oct 2008
Posts: 33
Likes: 0
From: Dayton, Ohio
Main Computer Whistles While it Works...
i know this sounds kind of funny but it is starting to get seriously annoying and at 50 bucks a pop its getting pricy and time consuming to try to find new computer modules. i have a 1995 Dodge Neon Highline with the computer number 123 and after a ride i will start hearing a whistle coming from the computer, the first computer was toast i couldnt read or clear codes from it, and the second i could read and clear codes but the whistle in the first one wasnt as loud as the whistle in the second computer is. what makes it whistle and how can i make it stop. and so you dont have to ask the 123 computer is a dealer only part and very pricey compared to the others that are around 275-290 bucks.
Thread Starter
|
Amateur
Joined: Oct 2008
Posts: 33
Likes: 0
From: Dayton, Ohio
i would have to say that about wraps everything up, because the whistle doesnt seem to affect anything, the new computer maybe louder but atleast i could get the codes cleared to turn off the check engine light.
Legend
Joined: Apr 2006
Posts: 9,112
Likes: 1
From: Spring, TX
Where did you hear that?
Trending Topics
Legend
Joined: Apr 2006
Posts: 9,112
Likes: 1
From: Spring, TX
I knew I read this somewhere before. From the .org's FAQ's...
The PCM (Powertrain Control Module) may emit a high-pitched "whistle" sound after the engine is shut off. The sound may last up to eight minutes. The noise can vary in pitch and intensity from one PCM to the next and with changes in temperature and battery system voltage. This noise is due to the PCM being "powered up" after ignition-off to enable a diagnostic routine for the O2 heater operation. This diagnostic routine will only occur when certain parameters are met, which include engine operating temperature and how long the vehicle has been driven. This noise may also be heard with the ignition on and engine running, but is usually muffled by the normal engine operation sounds.
Replacing the PCM may seem to eliminate the noise for a period of time, but this is only due to the system not meeting the qualifying parameters to run the ignition-off diagnostic routine. THIS IS AN OPERATIONAL CHARACTERISTIC OF THE PCM AND NO REPAIRS SHOULD BE ATTEMPTED.
Replacing the PCM may seem to eliminate the noise for a period of time, but this is only due to the system not meeting the qualifying parameters to run the ignition-off diagnostic routine. THIS IS AN OPERATIONAL CHARACTERISTIC OF THE PCM AND NO REPAIRS SHOULD BE ATTEMPTED.