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17-12-2009
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RustysRocker
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Join Date: May 2007
Location: Manchester, UK
Age: 53
Posts: 1,335 What Jeep do I drive?: TJ
Likes: 18
Liked 123 Times in 94 Posts
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buS b0 = PCM - MIL Message = The cluster is not receiving a MIL lamp message from the PCM.
buS b8 = ACM - Airbag Message = The cluster is not receiving an Airbag lamp message from the ACM.
The messages are probably due to a bad connection behind the cluster. In case you don't know the first couple of pages on this Jeepforum page show how to remove the cluster.
http://www.jeepforum.com/forum/f9/ga...nstall-752937/
Behind the cluster you will see two plugs in the dash. Use a pick or needle nose pliers to pull the contacts out slightly to give them a better contact and see if that clears the problem. It would be a good idea to try and clean the contacts too and put a little dielectric grease on them to try and prevent oxidisation of the contacts, which is probably what is causing your current problem.
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21-12-2009
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Senior Newbie
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Join Date: Jun 2009
Location: Darling Downs
Posts: 81 What Jeep do I drive?: TJ
Likes: 0
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4WD Reviews
Hi everyone,
I have been checking out this site for some time and thought I would pass it on.
http://www.offroaders.com/
The site isn't Jeep Specific but covers all makes and Models and covers all things offroad
It has very comprehensive reviews from Tyres and Suspension to winches and accessories etc.
I thought it is a very interesting read.
See what you all think.
__________________
 GO HARD OR GO HOME
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03-03-2010
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Full Flexer
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Join Date: Jun 2008
Location: In a garage
Posts: 955 What Jeep do I drive?: TJ
Likes: 0
Liked 4 Times in 4 Posts
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I have the same error comeing up on my tj bus b8 i took the cluster off cleaned all the contact points but the light is still there can anyone help me with this cheers.
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04-03-2010
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RustysRocker
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Join Date: May 2007
Location: Manchester, UK
Age: 53
Posts: 1,335 What Jeep do I drive?: TJ
Likes: 18
Liked 123 Times in 94 Posts
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Service manual says...
"buS b8 - Airbag Control Module (ACM) - Airbag Message - The cluster is not receiving an Airbag lamp message from the ACM. A DRBIII scan tool is required for further diagnosis. Refer to the appropriate diagnostic information."
Have you pulled the airbag fuses?
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05-03-2010
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Full Flexer
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Join Date: Jun 2008
Location: In a garage
Posts: 955 What Jeep do I drive?: TJ
Likes: 0
Liked 4 Times in 4 Posts
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yeah checked the air bag fuses there all good.
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05-03-2010
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Established Member
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Join Date: Jul 2009
Location: Hamilton, NZ
Posts: 237 What Jeep do I drive?: ZJ
Likes: 0
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i got 21 and 24 coming up, backfiring like buggery at 2000rpm. since chopping the exhaust off its been running great, then i washed the darned thing last saturday, was working fine, left it out in the sun, went to park it up that night and the light was on and the darned isssues started. Wonder if i got water into the ECU.
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Location: in the shed under the Jeep....
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06-03-2010
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RustysRocker
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Join Date: May 2007
Location: Manchester, UK
Age: 53
Posts: 1,335 What Jeep do I drive?: TJ
Likes: 18
Liked 123 Times in 94 Posts
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Quote:
Originally Posted by Shauny B
yeah checked the air bag fuses there all good.
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I'm stuck at that point. Might need connecting to a DRBIII scanner to find the cause.
Quote:
Originally Posted by KiwiMark
i got 21 and 24 coming up, backfiring like buggery at 2000rpm. since chopping the exhaust off its been running great, then i washed the darned thing last saturday, was working fine, left it out in the sun, went to park it up that night and the light was on and the darned isssues started. Wonder if i got water into the ECU.
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# 21 Oxygen sensor signal doesn't change (stays at 4.3-4.5V). Probably bad oxygen sensor
On early TJs code 21 could be for either oxygen sensor, you'd need a scanner like the scangauge2 to find out which sensor the code refers to.
# 24 Throttle position sensor over 4.96V
Did you wash the engine bay? The throttle position sensors don't like getting wet.
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