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Old 12-08-2010, 11:00 AM   #1
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Wtf does this mean? n0 bu5 on the odometer

I have a 2000 tj 2.5l. It has under 70000 miles on it. On occasion when i hit a bump or sometimes just randomly my jeep check engine light as well as my airbag light will come on and where the odometer is the mileage will go away and n0 bu5 will come up on there. The only way it will come off is if I hit my dash board pretty hard or if I hit another bump. There arent any codes when i run the computer so i have no clue what it is. Can anyone tell me?

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Old 12-08-2010, 11:06 AM   #2
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Excerpt from the 2002 Field Service Manual


VACUUM-FLUORESCENT DISPLAY
The Vacuum-Fluorescent Display (VFD) module is
soldered to the EMIC electronic circuit board. The
display is active when either door is opened or with
the ignition switch in the On or Start positions, and
inactive about twenty seconds after both doors are
closed when the ignition switch is in any other position.
If a door is left open with ignition switch in any
position except On or Start, the VFD will remain
illuminated until the interior lights control battery
saver (load shedding) timer expires after about
twenty minutes. The VFD has several display capabilities
including: odometer, trip odometer, software
version display, and can display various diagnostic
information. An odometer/trip odometer switch on
the EMIC circuit board is used to control several of
the display modes. This switch is actuated manually
by depressing the odometer/trip odometer switch
knob that extends through the lower edge of the cluster
lens, just right of center. Actuating this switch
momentarily with the VFD illuminated will toggle
the display between the odometer and trip odometer
modes. Depressing the switch button for about two
seconds while the VFD is in the trip odometer mode
will reset the trip odometer value to zero. Holding
this switch depressed while turning the ignition
switch from the Off position to the On position will
activate the EMIC self-diagnostic actuator test.
When illuminated, the VFD will automatically display
the message “no BuS” in place of the odometer
or trip odometer information if there is a loss of PCI
data bus communication, and will display the message
“noFuSE” if the instrument cluster is not receiving
battery current through the fused B(+) circuit
from the Ignition-Off Draw (IOD) fuse. The VFD will
nostic
procedures. Refer to the appropriate diagnostic
information for additional details on these VFD functions.
The VFD is diagnosed using the EMIC self-diagnostic
actuator test. (Refer to 8 - ELECTRICAL/INSTRUMENT
CLUSTER - DIAGNOSIS AND
TESTING). Proper testing of the PCI data bus and
the data bus message inputs to the EMIC that control
some of the VFD functions requires the use of a
DRBIIIt scan tool. Refer to the appropriate diagnostic
information. Specific operation details for the
odometer and trip odometer functions of the VFD
may be found elsewhere in this service information.

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Old 12-08-2010, 11:14 AM   #3
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thanks for that but im a simple man and really need a simple answer. i apologize for my stupidity but is there a basic explanation of what to do?"
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Old 12-08-2010, 12:50 PM   #4
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Quote:
Originally Posted by JeepersCreeperz4x4club View Post
thanks for that but im a simple man and really need a simple answer.
you have problem with gauges

Quote:
Originally Posted by JeepersCreeperz4x4club View Post
i apologize for my stupidity but is there a basic explanation of what to do?"
he posted it above. theres a TSB on a connector issue. connector comes off gauge cluster due to vibration or something along those lines. might want to look that up....pretty sure you need to pull the dash apart and pull the cluster out to fix it.
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Old 12-08-2010, 03:54 PM   #5
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removing the cluster is EXTREMLY SIMPLE, it takes a whole 5 minutes...
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Old 12-08-2010, 09:38 PM   #6
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This happened to me a while back... It means that your computer is not getting full communication with everything. If its like it was for me, this will be followed by dying at an idle in another couple of weeks or so and you will finally have to replace the battery! I tore the dash apart cleaned every wiring harness and everything trying to fix it and finally decided it was the battery. You probably have a bad cell inside the battery and starting to show itself.
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Old 12-08-2010, 09:55 PM   #7
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Your jeep Is trying to tell you that it's not a bus. Or maybe it hadn't seen a bus in a while and felt the need to declare it
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Old 12-09-2010, 12:09 PM   #8
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ok bobjenkins you were right. as soon as my jeep saw a bus it fixed itself. but seriously smiley you think its a battery? i thought it was an electrical problem and everyone told me its a loose connection in my gauges. I do lose my gauges when this happens. Could it be a fuse?
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Old 12-09-2010, 06:30 PM   #9
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Originally Posted by JeepersCreeperz4x4club View Post
ok bobjenkins you were right. as soon as my jeep saw a bus it fixed itself. but seriously smiley you think its a battery? i thought it was an electrical problem and everyone told me its a loose connection in my gauges. I do lose my gauges when this happens. Could it be a fuse?
well if it was a fuse, nothing would work at all, and the problem wouldn't be intermitent now would it?
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Old 12-09-2010, 06:39 PM   #10
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The next time it happens, push on the dash and see if it comes back on. If it does, your connection between the gauge cluster and where it mounts is bad. Then you have two options. Push every time it happens, replace the connector with a newer design, or use needlenose pliers to twist the male connectors so that the connections are more solid. I'm still pushing on my dash because I haven't found enough free time to mess with it and it's cold now.
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Old 12-09-2010, 06:44 PM   #11
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Push the cluster face firmly to seat the connector into the plug. I had a 2000 Sahara that did the same thing....hit a bump = "No bus". I tried hitting the top of the dash, and that would work temporally. I pushed the face of the gauge cluster and didn't have the problem again.

If that doesn't work, take the gauge cluster out and clean the terminals on the plug and socket with emory cloth.
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Old 12-09-2010, 09:20 PM   #12
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This is what fixed mine, but it would be a lot cheaper to try the other things first. It's real simple to pull the cluster out, but after I replaced the battery I have not had a problem out of it! If you have a spare battery laying around though I would defiantly try it!
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Old 12-11-2010, 08:35 PM   #13
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you definately are right its the connection but im not going to have the time for fix it. ill just beat the hell out of my gauges when it happens
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Old 12-11-2010, 10:27 PM   #14
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it takes all of 15 mins to pull it out and twist the pins on the gauge panel a 1/16ths of an inch and be done with it. havnt had an issue since!

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