no start, no bu5 - JeepForum.com
 
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post #1 of 13 Old 06-25-2007, 10:44 AM Thread Starter
IAmJeff
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no start, no bu5

I am new to the forums. i did a search and didnt turn up anything, so here goes. MY father in law has a '01 cherokee with the inline 6. the other day it wouldnt start, been running fin up until then. looked into it a little bit and noticed that it wasnt getting any fuel at the fuel rail. so we checked relays and fuses and everything was good. so we decided to replace the fuel pump. $120 later the jeep still isnt running, no fuel pressure. He told me that he had an error on his dash that read no bu5 before we did all this. also, the gas guage is at empty, but there was definitely gas in there. any help is greatly appreciated

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post #2 of 13 Old 06-25-2007, 11:03 AM
mpwal099
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The "no bus" on the cluster is generally a loose connection in your dash. It is easy to pull the dash apart, pull out the cluster, clean the connections and put a little dielectric grease on it and put it back together. Might want to try that before tackiling anything else. It is the cheapest option.

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post #3 of 13 Old 06-25-2007, 11:55 AM Thread Starter
IAmJeff
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that doesnt answer the no start problem tho does it? is this related?
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post #4 of 13 Old 06-25-2007, 12:01 PM
mpwal099
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no it doesn't, but who knows it might just start after fixing that.

When I die and go to heaven I hope the first thing God says to me is "The bar is right this way."
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post #5 of 13 Old 06-25-2007, 05:34 PM
x99j
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if i remember a crank position sensor has been known to cause a no bus once in a while along with your no power to fuel pump problem. some body with more knowledge please chime in. mike

06 kj 3.7l, 6speed manual, np241 command track

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post #6 of 13 Old 06-25-2007, 09:19 PM
dano.75
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No Start

I am a mechanic and I came across this same error message on a Dodge van. Unfortunatly the problem is you computer and most likely will need to be replaced. Cost should be approx. $700
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post #7 of 13 Old 06-25-2007, 09:58 PM
gunner87
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It was the CPS on my son's 01 XJ. He had the no bus code and would not run.
May be the same with yours.

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post #8 of 13 Old 06-26-2007, 06:23 AM Thread Starter
IAmJeff
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it sounds like that no bus error can be caused by several things. id really prefer to not buy a bunch more parts that i dont need. does the cps going bad cause the fuel pump to not work?
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post #9 of 13 Old 06-26-2007, 09:59 AM
x99j
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the way i understand it when the pcm fires up it checks the cps. it the cps checks out good it the turns on the asd relay which in turn, turns the fuel pump and injectors on. something in that whole chain triggers the no bus. most no buses are due to a bad cluster connection. but not all no buses are are a bad cluster connection. i have heard of 4 no buses where the vehicle won't start and the cps fixed it. this is by no means gospel, just what i have experienced through friends. hopefully some more people will speak up about what they know! mike

06 kj 3.7l, 6speed manual, np241 command track

91 yj 2.5l, ax-5, np 231 3 inck lift, 31'' mud rovers

12 kk 3.7L, 42rle, mp1522, d-30, 8.25.
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post #10 of 13 Old 07-11-2007, 01:02 PM Thread Starter
IAmJeff
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we changed the CPS, problem solved. thanks a lot for all of your input
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post #11 of 13 Old 07-11-2007, 02:43 PM
x99j
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glad to here you got off cheap! how many miles are on you o1? just like to know so i can replace my cps when i am getting in the range of your mileage! mike

06 kj 3.7l, 6speed manual, np241 command track

91 yj 2.5l, ax-5, np 231 3 inck lift, 31'' mud rovers

12 kk 3.7L, 42rle, mp1522, d-30, 8.25.
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post #12 of 13 Old 01-14-2008, 03:52 AM
spanish_lad
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Quote:
Originally Posted by IAmJeff
we changed the CPS, problem solved. thanks a lot for all of your input

so a bad cps would shut down the fuel?

i have fuel at the rail but still no start does that mean that my problem is NOT the cps?
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post #13 of 13 Old 01-14-2008, 06:04 AM
x99j
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Quote:
Originally Posted by spanish_lad
so a bad cps would shut down the fuel?

i have fuel at the rail but still no start does that mean that my problem is NOT the cps?
if you have spark it is not the cps!

some time a bad cps will cause the asd to shut down (no fuel) but not always!

start with the basics and check for spark!

06 kj 3.7l, 6speed manual, np241 command track

91 yj 2.5l, ax-5, np 231 3 inck lift, 31'' mud rovers

12 kk 3.7L, 42rle, mp1522, d-30, 8.25.
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