2000 jeep xj electric fan problems - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > 2000 jeep xj electric fan problems

FS: Jeep Fog Light LED Bulbs! Several Brightness Options! SPARTAN LOCKERS are on sale BIG TIME at ROCKRIDGE 4WD!Yukon Ultimate 35 axle kit for c/clip axles with Yukon Zip

Reply
Unread 05-13-2011, 02:05 PM   #1
badlands1
Registered User
1989 XJ Cherokee 
 
Join Date: Sep 2008
Location: Lagrange
Posts: 360
2000 jeep xj electric fan problems

My fan quit working on my jeep a week ago well now theres 85 plus degree wheather.I tested the fan to the battery and it works.So now Im thinking the electric fan thermostats bad.When I looked the part up it was very confusing.I dont even know where it is located on the vehicle. Any help will be greatly apreciated.Nate

__________________
Dont tread on me...
Attica,IN Badlands trip aug.3 If anyone wants to meet up let me know.
badlands1 is offline   Reply With Quote
Unread 05-13-2011, 02:31 PM   #2
badlands1
Registered User
1989 XJ Cherokee 
 
Join Date: Sep 2008
Location: Lagrange
Posts: 360
Alright well after more tinkering I figured its not the thermostat because the big fuse for the thermostat/e-fan is clicking on and off when the air is on.But then I tested the plug that plugs into the efan and no power at all so theres a break somewhere..I dont know where to start??You can follow that plug until the driver fender then it dissapears into the big wire harness.Any ideas?
__________________
Dont tread on me...
Attica,IN Badlands trip aug.3 If anyone wants to meet up let me know.
badlands1 is offline   Reply With Quote
Unread 05-13-2011, 03:15 PM   #3
hguzmanjr
Registered User
1995 YJ Wrangler 
 
Join Date: Sep 2008
Location: Philadelphia, PA Pennsylvania
Posts: 170
Get rid of the stock fan and install dual 10" fans. If not you can temporarily run a manual switch to the stock fan and turn it on as needed. Good luck
__________________
____=__=
l l ,[_____],
l---- L -[]lllllll[]-
()_) ()_)--o-)_) 1998 Jeep Cherokee Sport - RIP
______________1995 Jeep Wrangler S 2.5L 5speed
______________1995 Jeep Cherokee Country 4.0L - Even trade for the 95 YJ
______________1999 Jeep Grand Cherokee Limited 4.0L - SOLD
______________2000 Jeep Grand Cherokee Laredo 4.0L
______________1999 Jeep Wrangler Sahara 4.0L - Traded
______________1992 Jeep Cherokee 4.0L - Traded in for the 99 Sahara
hguzmanjr is offline   Reply With Quote
Unread 05-13-2011, 03:56 PM   #4
badlands1
Registered User
1989 XJ Cherokee 
 
Join Date: Sep 2008
Location: Lagrange
Posts: 360
Yeah I know a switch is my last option.I kind of want to fix it as it was intended to work first.It seems like its in the fuse block.Im in the process of looking under the fuse block right now.
__________________
Dont tread on me...
Attica,IN Badlands trip aug.3 If anyone wants to meet up let me know.
badlands1 is offline   Reply With Quote
Unread 05-13-2011, 04:35 PM   #5
mixje
Registered User
2000 XJ Cherokee 
 
Join Date: Mar 2011
Location: Toms River, New Jersey
Posts: 40
I'm having this same problem, I just haven't really investigated it yet. Had to replace power steering pump twice in two days, so that took up the time I was going to devote to this issue... definitely interested in what you find out.
mixje is offline   Reply With Quote
Unread 05-14-2011, 12:56 PM   #6
badlands1
Registered User
1989 XJ Cherokee 
 
Join Date: Sep 2008
Location: Lagrange
Posts: 360
I ended up putting a switch on it.Confusing I could hear the relay kicking on but wasnt getting power to the fan then it seemed as if there was a bad connection in the fuse block.I messed with it for 3 hours and gave up.
__________________
Dont tread on me...
Attica,IN Badlands trip aug.3 If anyone wants to meet up let me know.
badlands1 is offline   Reply With Quote
Unread 05-14-2011, 04:41 PM   #7
hguzmanjr
Registered User
1995 YJ Wrangler 
 
Join Date: Sep 2008
Location: Philadelphia, PA Pennsylvania
Posts: 170
Quote:
Originally Posted by badlands1 View Post
I ended up putting a switch on it.Confusing I could hear the relay kicking on but wasnt getting power to the fan then it seemed as if there was a bad connection in the fuse block.I messed with it for 3 hours and gave up.
I feel your pain. I did the same thing w/ my 98 XJ until the stock fan wouldn't even turn on anymore w/ the manual switch. So I replaced the stock fan w/ an aftermarket high speed fan and it worked great! Kept the Jeep way cooler than the stock fan. More than likely your stock fan may be on the fritz.
__________________
____=__=
l l ,[_____],
l---- L -[]lllllll[]-
()_) ()_)--o-)_) 1998 Jeep Cherokee Sport - RIP
______________1995 Jeep Wrangler S 2.5L 5speed
______________1995 Jeep Cherokee Country 4.0L - Even trade for the 95 YJ
______________1999 Jeep Grand Cherokee Limited 4.0L - SOLD
______________2000 Jeep Grand Cherokee Laredo 4.0L
______________1999 Jeep Wrangler Sahara 4.0L - Traded
______________1992 Jeep Cherokee 4.0L - Traded in for the 99 Sahara
hguzmanjr is offline   Reply With Quote
Unread 05-14-2011, 06:55 PM   #8
xGArfx
Registered User
1999 XJ Cherokee 
 
Join Date: Mar 2008
Location: Paramus NJ
Posts: 859
Check a FSM or Chilton ect. and see which fuse or relay is for the xj electric fan. I'd bet the relay/fuse blew on it and thats why its not working unless you jump it to the battery. I don't know which is which so unless someone else can tell you this you will need to look it up somewhere in a manual.
xGArfx is offline   Reply With Quote
Unread 05-15-2011, 12:30 AM   #9
hguzmanjr
Registered User
1995 YJ Wrangler 
 
Join Date: Sep 2008
Location: Philadelphia, PA Pennsylvania
Posts: 170
X2 on checking a Chiltons or Haynes manual. However I still believe your issue is at the fan level. Just my 2 pennies
__________________
____=__=
l l ,[_____],
l---- L -[]lllllll[]-
()_) ()_)--o-)_) 1998 Jeep Cherokee Sport - RIP
______________1995 Jeep Wrangler S 2.5L 5speed
______________1995 Jeep Cherokee Country 4.0L - Even trade for the 95 YJ
______________1999 Jeep Grand Cherokee Limited 4.0L - SOLD
______________2000 Jeep Grand Cherokee Laredo 4.0L
______________1999 Jeep Wrangler Sahara 4.0L - Traded
______________1992 Jeep Cherokee 4.0L - Traded in for the 99 Sahara
hguzmanjr is offline   Reply With Quote
Unread 05-15-2011, 02:09 PM   #10
Virginia John
Registered User
2001 XJ Cherokee 
 
Join Date: Jan 2008
Location: Martinsburg, WV
Posts: 55
40A fuse feeds the relay.
Virginia John is offline   Reply With Quote
Unread 05-15-2011, 05:46 PM   #11
badlands1
Registered User
1989 XJ Cherokee 
 
Join Date: Sep 2008
Location: Lagrange
Posts: 360
The relay is working.But I now I have a code threw and I erase is and it comes back.The code is P1491.Anyone have a clue??Im not that great with electrical.
__________________
Dont tread on me...
Attica,IN Badlands trip aug.3 If anyone wants to meet up let me know.
badlands1 is offline   Reply With Quote
Unread 05-15-2011, 08:37 PM   #12
willobegolfer
Registered User
2000 XJ Cherokee 
 
Join Date: Feb 2010
Location: Spring Hope NC, North Carolina
Posts: 13
Hello

When Monitored and Set Condition:
P1491-RAD FAN CONTROL RELAY CIRCUIT
When Monitored: With the ignition key on, battery voltage greater than 10.0 volts and the PCM requests the radiator fan to be turned on.
Set Condition: An open or shorted circuit is detected in the radiator fan relay control circuit.

POSSIBLE CAUSES
RADIATOR FAN CTRL RLY CIRCUIT WIRE HARN INTERMITTENT DEFECT
RADIATOR FAN CTRL RLY CIRCUIT WIRE HARN OBSERVABLE DEFECT
RADIATOR FAN RELAY GROUND CIRCUIT OPEN
RAD FAN RELAY CONTROL CIRCUIT OPEN
RADIATOR FAN RELAY CONTROL CIRCUIT SHORT TO GROUND
RAD FAN CONTROL RELAY DEFECTIVE
PCM DEFECTIVE

Ignition On, Engine Not Running
With the Scan tool, actuate the Radiator Fan Control.
Does the Radiator Fan Motor Cycle on and off?
Yes Go To 641
No Go To 643

641
Ignition On, Engine Not Running
With the DRB, actuate the Radiator Fan Control.
Wiggle the Wiring Harness from the Relay to the Powertrain Control Module.
Did the wiggling interrupt the Radiator Fan Motor cycling?

Yes Repair as necessary where wiggling caused the cycling to be interrupted.
No Go To 642

642
Turn ignition off.
inspect the Wiring and Connectors.
Were any problems found?

Yes Repair as necessary.
No Test Complete.

643
Turn ignition off.
Disconnect the Radiator Fan Relay.
Using an ohmmeter, measure the Radiator Fan Relay Ground Circuit to Ground.
Is the resistance below 5.0 ohms?

Yes Go To 644
No Repair the open Ground Circuit.

644
Turn ignition off.
Disconnect the PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Disconnect the Radiator Fan Relay Connector.
Note: Check connectors - Clean/repair as necessary.
Using an Ohmmeter, measure the resistance of the Rad Fan Relay Control Circuit from the Relay to the PCM.
Is the resistance below 5.0 ohms?

Yes Go To 645
No Repair the open Radiator Fan Relay Control Circuit.

645
Turn ignition off.
Disconnect the Radiator Fan Relay Connector.
Note: Check connectors - Clean/repair as necessary.
Disconnect the PCM Connector.
Using an Ohmmeter, measure the Radiator Fan Relay Control Circuit to ground.
Is the resistance below 5.0 ohms?

Yes Repair the Radiator Fan Relay Control Circuit for a short to ground.
No Go To 646

646
Turn ignition off.
Disconnect the PCM Connector.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire to the Radiator Fan Relay Control Circuit at PCM.
Momentarily connect the other end of the jumper wire to a good ground.
Did the Radiator Fan actuate?

Yes Replace the Radiator Fan Relay.
No Go To 647

647
If there are no other potential causes remaining, the PCM is assumed to be defective.
View repair options.
Repair
Replace the PCM.

I hope that this helps you

RADIATOR FAN RELAY - 4 WAY CAV CIRCUIT FUNCTION
1 0BK GROUND
2 DB/BK RADIATOR FAN RELAY CONTROL
3 DG RADIATOR FAN RELAY OUTPUT
4 GY FUSED B(+)

POWERTRAIN CONTROL MODULE C2 - WHITE 32 WAY CAV CIRCUIT FUNCTION
1 VT (4.0L) TRANSMISSION TEMPERATURE SENSOR SIGNAL
2 DB/TN (4.7L) FUEL INJECTOR NO. 7 DRIVER
3 - -
4 WT/DB FUEL INJECTOR NO. 2 DRIVER
5 YL/WT FUEL INJECTOR NO. 3 DRIVER
6 GY FUEL INJECTOR NO. 5 DRIVER
7 BR (4.7L) COIL DRIVER NO. 7
8 PK (4.0L) GOVERNOR PRESSURE SOLENOID CONTROL
9 TN/PK (4.7L) IGNITION COIL DRIVER NO. 2
9 TN/PK (4.0L) IGNITION COIL DRIVER NO. 2
10 DG GENERATOR FIELD DRIVER
11 DG/LB (4.0L) TORQUE CONVERTER CLUTCH SOLENOID CONTROL
12 BR/DB FUEL INJECTOR NO. 6 DRIVER
13 DG/GY (4.7L) FUEL INJECTOR NO. 8 DRIVER
14 - -
15 TN FUEL INJECTOR NO. 2 DRIVER
16 LB/BR FUEL INJECTOR NO. 4 DRIVER
17 DB/PK RADIATOR FAN RELAY CONTROL
18 - -
19 - -
20 - -
21 BR/WT (4.0L) 3-4 SHIFT SOLENOID CONTROL
22 - -
23 GY/YL ENGINE OIL PRESSURE SENSOR SIGNAL
24 - -
25 DB/BK (4.0L) SPEED SENSOR GROUND
26 - -
27 WT/OR VEHICLE SPEED SENSOR SIGNAL
28 LG/WT OUTPUT SPEED SENSOR SIGNAL
29 LG/RD GOVERNOR PRESSURE SENSOR SIGNAL
30 PK/YL (4.0L) TRANSMISSION CONTROL RELAY CONTROL
31 VT/WT 5V SUPPLY
32 - -
willobegolfer is offline   Reply With Quote
Unread 05-15-2011, 09:13 PM   #13
filluptrk
Web Wheeler
2000 XJ Cherokee 
 
Join Date: Dec 2006
Location: Coarsegold, CA
Posts: 1,202
That is a short or open circuit code. What you can do easily is to put a VOM check on fan connection, the light blue is 12v, the black is ground. See if it shows the fan has a good circuit. If it has then reconnect it.

The relay solenoid inside may make noise but if the relay connection inside is bad it doesn't work. The fuse for the fan motor is #5 in the PDC a 40A fuse. If it is blown it could be a short or the fan is faulty and drawing too much current. Just look at the PDC cover to find that fuse in the diagram inside.

You can pull the fan relay and looking at the slots where it was you'll see 5 of them with 3 going one way and 1 on each side ignore those. Take a wire and put it into the end slots in those 3 slots. Forget the middle one. Those end slots are fused power and fan. If you turn on ignition, and put the wire into those slots you should hear the fan run.

Last edited by filluptrk; 05-15-2011 at 09:35 PM.. Reason: addition
filluptrk is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.