DLC no power OBD2
#1
Junior Member
Thread Starter
Join Date: May 2011
Location: Vermont
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: Str8 6 4.0l
DLC no power OBD2
My 2000 xj is unable to read codes. When plugged in it does not detect a signal.
I have unhooked my PCM and cleaned all of the connectors and still no luck.
I am having issues with the Cherokee not running correctly and need to fix my DLC in order to solve my problem.
Please any help thoughts or suggestions
I have unhooked my PCM and cleaned all of the connectors and still no luck.
I am having issues with the Cherokee not running correctly and need to fix my DLC in order to solve my problem.
Please any help thoughts or suggestions
#3
Senior Member
Have you tried reading the codes without a scanner? There is a trick to get it to display them on the odometer.
http://jeephorizons.com/phpbb/viewtopic.php?t=2719
http://jeephorizons.com/phpbb/viewtopic.php?t=2719
#4
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 82 Likes
on
67 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Have you tried reading the codes without a scanner? There is a trick to get it to display them on the odometer.
http://jeephorizons.com/phpbb/viewtopic.php?t=2719
http://jeephorizons.com/phpbb/viewtopic.php?t=2719
#6
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 82 Likes
on
67 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
There are several reasons that your scan tool doesn't power up when connected to the DLC. Corroded pin cavities in the DLC or a bad ground connection. Pin cavity 16 is the 2 VDC power tap for the scan tool and pin cavity 4 is the ground circuit for the tool.
First thing to do is to closely examine pin cavities 4, 5, and 16 for corrosion and enlarged pin cavities from Bubba shoving probes in them.
Next, determine if you are getting 12 VDC to the tool power circuit. Using a voltmeter, touch pin cavity 16 with the (+) probe of the meter and pin cavity 4 with the (-) probe. You should see battery voltage. If not try pin cavity 5 with the (-) probe. Still no 12 VDC? Probe pin cavity 16 (+) and then find a clean chassis ground for the (-) probe. If you get 12 volts now, the ground connections at the oil dipstick tube support bracket mount stud may be corroded or not connected.
Pin 16 is powered from fuse 17 in the PDC, but it is unlikely it is blown because it powers the headlamp switch as well.
Let us know what you find.
#7
Junior Member
Thread Starter
Join Date: May 2011
Location: Vermont
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: Str8 6 4.0l
Awesome; thank you. I have to get an electrical tester; only thing else I can think us whether ur not when the tech installed my car starter/alarm if they could have messed up or used part if the wires? I will update
Trending Topics
#8
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 82 Likes
on
67 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Here's what Chrysler has to say about this:
CAUTION: A 12 VOLT TEST LIGHT SHOULD
NOT BE USED FOR THE FOLLOWING
CIRCUITS, DAMAGE TO THE POWERTRAIN
CONTROLLER WILL OCCUR.
NOT BE USED FOR THE FOLLOWING
CIRCUITS, DAMAGE TO THE POWERTRAIN
CONTROLLER WILL OCCUR.
5 Volt Supply
J1850 PCI Bus
CCD Bus
CKP Sensor Signal
CMP Sensor Signal
Vehicle Speed Sensor Signal
O2 Sensor SignalJ1850 PCI Bus
CCD Bus
CKP Sensor Signal
CMP Sensor Signal
Vehicle Speed Sensor Signal
#12
Junior Member
Thread Starter
Join Date: May 2011
Location: Vermont
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: Str8 6 4.0l
Lights are good; fuses are all checked under dash n hood. Ground wires are attached n certainly not corroded or rusted @ the oil dipstick.
Getting electrical voltage/ohmmeter tomorrow to do some more diagnosing.
I have an aftermarket alarm/car starter- wondering if something like that could have interfered??
Getting electrical voltage/ohmmeter tomorrow to do some more diagnosing.
I have an aftermarket alarm/car starter- wondering if something like that could have interfered??
#13
Junior Member
Thread Starter
Join Date: May 2011
Location: Vermont
Posts: 79
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: Str8 6 4.0l
So I tested the pins at the DLC and I got nothing for any reading. Great now power. Rechecked all fuses AGAIN; still nada. Traced the wires under the dash for about 7" and they look fine no tampering or issues that I can see.
Thoughts?
Thoughts?
#14
CF Veteran
Join Date: Aug 2010
Location: Canton, MI
Posts: 8,357
Likes: 0
Received 82 Likes
on
67 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Did you try "Probe pin cavity 16 (+) and then find a clean chassis ground for the (-) probe. If you get 12 volts now, the ground connections at the oil dipstick tube support bracket mount stud may be corroded or not connected."