2003 radiator fan relay
08-01-2009, 12:10 AM
Registered User
Thread Starter
Join Date: Jul 2009
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
2003 radiator fan relay
hey guys i really need help........ my 2003 grand caravan radiator fans wont work. right now i have them hot wired to a switch but i dont like the idea of it.
background...
where to begin. i have replaced the coolant temp sensor twice and still have the same problem. i checked it with the multimeter and the voltage does change as the temp increases. i have also replaced the relay and the 40amp fuse in the block. i do notice that when the engine is running i get about 6.2 volts going to the radiator fans if they are disconnected but as soon as i plug the pigtails in the voltage drops. there is 12v going into the relay and if i jump the connection the fans run. this may be confusing so msg me if u need me to clarify anything. i really would like a wiring diagram of the fan system with voltages but can not find any.. please any help is greatly appreciated
08-01-2009, 12:18 AM
Site Moderator & Tech
Dodge Forum Moderator
Join Date: Apr 2007
Location: Near Sacramento,ca
Posts: 11,335
Likes: 0
Replace the fan relay. Its in the front bumper fascia on the passager side. You'll need to remove the fascia.
08-01-2009, 10:02 AM
Registered User
Thread Starter
Join Date: Jul 2009
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
Already Replaced it but the fans still don't work. When I disconnect the coolant temp sensor the fans don't run and the same goes if I turn on the a/c. Could there be an I line fuse somewhere? If I had a shop manual or a wiri g diagram with the voltages it might help
08-01-2009, 10:42 AM
Join Date: Apr 2009
Posts: 337
Likes: 0
Received 0 Likes on 0 Posts
Is the CEL on?
I am having trouble posting the diagram for you .....
To get you going ..
terminals at relay
1- org/red wire 12v from 40amp fuse
2-dkblu/dkgrn 12v to fans
3-dkblu/vio signal from PCM
4- blk/dkgrn ground -relay and fans
I agree the relay is suspect- new does NOT mean good.
you might try using a DVOM selecting A/C and probing terminal 3 for voltage...checking for command from PCM
LET us know
08-02-2009, 06:02 PM
Registered User
Thread Starter
Join Date: Jul 2009
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
1- org/red wire 12v from 40amp fuse
2-dkblu/dkgrn 12v to fans
3-dkblu/vio signal from PCM
4- blk/dkgrn ground -relay and fans
k ill have to take the fascia off this week. its been a cpl weeks since i had it off but heres what i remember ill post the other voltages when i get it off.
1- org/red wire 12v from 40amp fuse---12v
2-dkblu/dkgrn 12v to fans---6.2v (but when i plug in the fans the voltage is 0v
3-dkblu/vio signal from PCM-----
4- blk/dkgrn ground -relay and fans----0v
08-02-2009, 06:19 PM
Registered User
Thread Starter
Join Date: Jul 2009
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
disregard my last post here are the voltages i get
1- org/red wire 12v from 40amp fuse---13.26v
2-dkblu/dkgrn 12v to fans--6.02v (0v when i plug the pigtails into the fans)
3-dkblu/vio signal from PCM----0v
4- blk/dkgrn ground -relay and fans---13.26v (if this is the wire all the way on the opposite side of the org/red wire
08-02-2009, 06:21 PM
Registered User
Thread Starter
Join Date: Jul 2009
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
im guna assume that there is a short somewhere between the computer and the ground or even a bad ground
08-04-2009, 11:23 AM
Join Date: Apr 2009
Posts: 337
Likes: 0
Received 0 Likes on 0 Posts
If you probe the fan circuit (#2) be sure to unplug the fan -
this will seperate wiring from the motors.
what about the question is the cel on?
ARe you back probing? or probing just harness?
ck terminal #4 -eng off- for ground.
08-05-2009, 08:05 AM
Registered User
Thread Starter
Join Date: Jul 2009
Posts: 6
Likes: 0
Received 0 Likes on 0 Posts
The CEL is on i cleared the codes but still get 2 codes saying that the coolant temp sensor voltage is to high and too low. i have replaced the coolant temp sensor twice so i dont know why it would be saying that.
the fan circuit shows 6.02 volts when the fans are unplugged. when i plug the fans back in the voltage is 0v. i was probing the wires right off the harness while it was plugged in.
this may sound stupid but how do i check for ground with my multi meter?
08-05-2009, 09:28 AM
Join Date: Apr 2009
Posts: 337
Likes: 0
Received 0 Likes on 0 Posts
The codes are 1st step now.
post the code #s pxxxx- sometimes confusion as to description and many eyes will catch that
with the harness connected to module and probing the circuit is backprobing ....
doing this- with engine running what is activity on PCM circuit with A/C on and then off?
Disconnect BOTH ends of circuit...confirm meterr* ...one probe to ggouund other probe to wire ... any reading other than infinity is
suspect..
*touch probes together checking tool watching for reading..
Posted by: jacquelinedeput1942aez.blogspot.com
Source: https://dodgeforum.com/forum/dodge-caravan/209329-2003-radiator-fan-relay.html
0 Komentar