01 XJ Wiring Nightmare..
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
In either case, is your climate control mode selector set to OFF when this happens?
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If it's the radiator electric fan, remove its relay from the PDC and examine the relay's pin cavities in the PDC for corrosion, and examine the relay blades as well. Try turning the key to RUN with the relay removed and see if the fan kicks on.
Do the same for the ASD relay.
Your PDC:
Thread Starter
Member
Joined: Mar 2011
Posts: 190
Likes: 1
From: N.E. Ohio
Year: 1996
Model: Cherokee
Engine: 4.0L
Its the radiator cooling fan. And with the relay removed it shuts off. When i get buzzing i get the rad fan relay buzzing in parallel with the asd relay. There is no corrosion in the engine fuse box. I removes the under cover aswell and swapped relays with the 01.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Pulled the white connector on the jb with a 10mm bolt and it looked clean, there is corrosion on the data link pins but i still have power and grounds according to my ****ty test lights. I already swapped ecms with my 01 xj and both computers started my other one. The problem is we had this thing running and the instrument cluster still said no bus, then it just stopped starting again.
Read below.
CAUTION: A 12 VOLT TEST LIGHT SHOULD
NOT BE USED FOR THE FOLLOWING
CIRCUITS, DAMAGE TO THE POWERTRAIN
CONTROLLER WILL OCCUR.
5 Volt Supply
8 Volt Supply
J1850 PCI Bus
CCD Bus
CKP Sensor Signal
CMP Sensor Signal
Vehicle Speed Sensor Signal
O2 Sensor Signal
CIRCUITS, DAMAGE TO THE POWERTRAIN
CONTROLLER WILL OCCUR.
5 Volt Supply
8 Volt Supply
J1850 PCI Bus
CCD Bus
CKP Sensor Signal
CMP Sensor Signal
Vehicle Speed Sensor Signal
O2 Sensor Signal
See if you can buy a quailty digital Volt/Ohmmeter to use when troubleshooting your electrical problems. A fairly good one will cost in excess of $30.00. Do not get an "Autoranging" meter.
Thread Starter
Member
Joined: Mar 2011
Posts: 190
Likes: 1
From: N.E. Ohio
Year: 1996
Model: Cherokee
Engine: 4.0L
I guess ill stop at harbor frieght on the way home from work and get one. My tesy light reads 2v,8v,12v,24v and continuity. I guess its not that much of a pos lol i have it set to 2v so i know im getting power atleast
Thread Starter
Member
Joined: Mar 2011
Posts: 190
Likes: 1
From: N.E. Ohio
Year: 1996
Model: Cherokee
Engine: 4.0L
Mine didnt appear anywhere near that corroded, but im gonna pull it anyway. Fuse #10 was the most corroeded socket, only it was white powder not green
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
If you can, take some photos of the removed JB and post them.
If you don't have a Photobucket account you should get one for posting purposes. Photobucket is free.
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Chill.
Have some beverages.
Did you or did you not disassemble the PDC to see if there's any problems with the wiring in the box?
ASD, Radiator Fan, now Starter. All controlled through relays in the PDC.
That JB is like new!
Have some beverages.
Did you or did you not disassemble the PDC to see if there's any problems with the wiring in the box?
ASD, Radiator Fan, now Starter. All controlled through relays in the PDC.
That JB is like new!