Go Back   DodgeForum.com > Dodge Cars > Dodge Neon
Sign in using an external account
Register Forgot Password?


Dodge Neon The sport compact car that took the world by storm. the Dodge Neon. Depending on the trim level you get, this sporty ride has something to offer everyone.
Sponsored by IloveHID
Click Here


2000 Neon P1490 - Chasing the Fault

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 07-26-2013, 03:23 AM
GeorgeHall.T's Avatar
GeorgeHall.T GeorgeHall.T is offline
Registered User
Garage is empty, add now
 
Join Date: Jul 2013
Vehicle: 2000 Neon
Location: Washington
Posts: 4
Default 2000 Neon P1490 - Chasing the Fault

My 2000 Neon Keeps bringing back the P1490 check engine light code (Low speed fan open circuit). What I have done so far;

  • Ran a self-test on the instrument cluster. (While holding the trip reset button down turn the key to the "on" position. watch to see if the gauges sweep during this test. If they do not, the cluster is bad and will need to be replaced.) The gages all swept just fine.
  • Warmed the engine up by running it, the temperature gage tracked the engine temp thus the temperature sensor is working.
  • Checked Fan Fuse (bench test - fuse is conducting)
  • Check Fan Relay (bench test - relay is functioning)
  • Checked the fan motor (Turned on the AC - fan motor runs)
  • Ran conductivity test from the fan connector to the relay – conductivity is fine.

My questions:
What exactly constitutes the “low speed fan circuit” that is being monitored by the computer for this error code?
What other possibilities are there in this circuit that could cause this error code and how do I test them?
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
Reply With Quote
  #2  
Old 07-26-2013, 06:30 AM
als99r/t als99r/t is offline
Amateur
Garage is empty, add now
 
Join Date: Dec 2012
Vehicle: 1999 RT
Location: O'Fallon, MO
Posts: 47
Default

the code you got is for low speed fan circuit and the relay could be whats causing that too happen or the temperature sensor on it, that's what makes the fan kick in on it,try flushing the engine and radiator out on it and try another low speed fan relay,its possible you got a bad one from the parts store,id also flush the heater core out real good on it,keep one thing in mind after market parts are mostly made over sea,s and aren't always as good as they seem to be,good luck. one part of the relay can be good and the other part bad,so yes in answer to your question it could still be a bad relay on it.
Reply With Quote
  #3  
Old 07-26-2013, 08:19 PM
GeorgeHall.T's Avatar
GeorgeHall.T GeorgeHall.T is offline
Registered User
Garage is empty, add now
 
Join Date: Jul 2013
Vehicle: 2000 Neon
Location: Washington
Posts: 4
Default

Quote:
Originally Posted by als99r/t View Post
...try flushing the engine and radiator out on it ... id also flush the heater core out real good on it...
Thank you for the response I appreciate it.

I have seen this response in other forums on the web, all with the same result...not effective. That makes sense to me since this error code is an open circuit code and not a fluid level or clarity indication, unless I'm missing something such as a sensor in the low speed fan circuit that would be effected by the fluid clarity. Is there one? I have not heard of anything along those lines except possibly the temperature sensing gage and that would not provide an open circuit indication because of the fluid needing flushed. It might provide an open circuit indication if it were malfunctioning (assuming it is even in the low speed fan circuit), but that would be indicated by the lack of the temperature gage on the dash to track engine temperature. Since I have validated that the temperature gage is indeed tracking the engine temp properly we can therefore assume that the temp sensor is working properly.


Quote:
... try another low speed fan relay,its possible you got a bad one from the parts store ... part of the relay can be good and the other part bad,so yes in answer to your question it could still be a bad relay on it...
To preclude that possibility I set up a functional test bench and performed a complete functional test of the relay on the test bench. All aspects of the relay are functioning properly.

This brings us back to the original questions:

What exactly constitutes the “low speed fan circuit” that is being monitored by the computer for this error code?
What other possibilities are there in this circuit that could cause this error code and how do I test them?
Reply With Quote
  #4  
Old 08-02-2013, 05:31 PM
GeorgeHall.T's Avatar
GeorgeHall.T GeorgeHall.T is offline
Registered User
Garage is empty, add now
 
Join Date: Jul 2013
Vehicle: 2000 Neon
Location: Washington
Posts: 4
Default

Yesterday I went down to the parts counter at the Dodge dealer in Auburn Washington to see if I could buy the parts for the "low speed fan control relay circuit". That is the whole system...they could not help me and sent me to the service department. The service department rep told me ... and I quote "I don't have a clue what a low speed fan control relay circuit is". However, if I would bring the dead car to them they would fix it at whatever rate they felt like charging me. At the moment I'm living off the food bank and gas cash to get to a job interview is hard to come by so I have to do this myself...no other option, this is frustrating.

I'm starting to empathize with that east coast state that a couple years ago tried to get the "right to maintain" bill on the ballet that would require auto makers to make available to auto owners all of the maintainability information required to maintain their own vehicle. I never did hear if they succeeded, but I wish we had that law here.

Be that what it may, can anybody provide a succinct definition of what constitutes the "low speed fan control relay circuit" that is being monitored by the computer for this error code on a 2000 Neon?
Reply With Quote
  #5  
Old 08-29-2013, 09:52 PM
GeorgeHall.T's Avatar
GeorgeHall.T GeorgeHall.T is offline
Registered User
Garage is empty, add now
 
Join Date: Jul 2013
Vehicle: 2000 Neon
Location: Washington
Posts: 4
Default

The error code now goes away on its own and then comes back a few days later. Fortunately it went away long enough to pass emissions.
Reply With Quote
Old 08-29-2013, 09:52 PM
Reply
 
 
 




Tags
fan, low speed, p1490

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join DodgeForum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -4. The time now is 02:22 PM.

© Internet Brands, Inc.


Contact Details & Emails

Search Engine Friendly URLs by vBSEO 3.5.2