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I have 1999 dakota no bus code in speedometer, I replaced…

Customer Question
I have 1999 dakota...

I have 1999 dakota no bus code in speedometer, I replaced the PCM but still have the code, the PCM was remained from CarComputer ?

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

No bu S or perhaps 5

Mechanic's Assistant: Are you fixing your Dakota yourself? What have you tried so far?

Yes i am, let give you all info from the start of the trouble, going down the road it would stall when ever brakes were applied, got it home then it wouldn't start again and had clicking in the under hood fuse box on the Auto shutdown

Submitted: 10 months ago.Category: Dodge
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Answered in 24 minutes by:
9/18/2017
Dodge Mechanic: Chris (aka-Moose), Technician replied 10 months ago
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Dodge
Satisfied Customers: 52,579
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Have you tried scanning it to see if the PCM will communicate and show stored codes?

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Customer reply replied 10 months ago
No i haven't yet, it seems my brother has borrowed my scaner, I will get it back when he gets home from work, anything I can try til then?
Customer reply replied 10 months ago
did you get the additional information I sent about How the problem was from the beginning?
Dodge Mechanic: Chris (aka-Moose), Technician replied 10 months ago

Lets hold off till tonight so we are diagnosing with as much info as possible.

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Customer reply replied 10 months ago
Alright, I will log back in later, see you then.
Dodge Mechanic: Chris (aka-Moose), Technician replied 10 months ago

Sounds good.

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Customer reply replied 10 months ago
Chris, I put the computer on the 99 dakota, and it read NO LINK, which was the same before the new reman. PCM?
Customer reply replied 10 months ago
let me know if you would like me to tell you all the events what was tried and such that lead up to the not starting ?
Dodge Mechanic: Chris (aka-Moose), Technician replied 10 months ago

Scan tool plugged up, did the vehicle start then?

What liter engine?

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Customer reply replied 10 months ago
This is how event unfolded, Its a 99 Dakota 3.9 liter eng, 67k miles, It began with the Truck stalling when going down the road, when the brakes were pressed, Did this for 3 days, Drove it to my garage, Then the truck wouldnt start again, all that would happen was When attempting to start the truck,(didn't start) there was buzzing coming from the Auto Shutdown relay under the hood, changed relays, but did not get rid of buzzing nor did the truck start, suddenly while trying to start, the buzzing stopped, put on computer and it came back NO LINK, then the speedometer now flashes a few times, then came up with the No Bus code in speedometer???
Customer reply replied 10 months ago
ordered a remained PCM from Carcomputer.com I changed the PCM, same issue! got a slight start once after putting a small amount of gas in carb, lasted less then a second, I can hear the fuel pump working so that's ok, truck still wouldn't start just turm over? P.S. truck is a standard trans & 2wd
Dodge Mechanic: Chris (aka-Moose), Technician replied 10 months ago

Thanks, ***** ***** to scan and the no bus are signs that the PCM is bad or the PCM is not getting all the powers and grounds it needs.

Use this diagram https://www.dropbox.com/s/z83tum1gw4r6986/39pcm.pdf?dl=0

Check these pins

C1-31,32,2, 22

If they are good then we need to test the 5 volt reference signal to see if it is shorted.

Now that I have posted a partial or complete answer, you will see you can rate me. The deposit you have already paid is not transferred to me until you rate me. I would like to receive nothing less than 5 star excellent ratings. So if we are not there yet, please reply and let me help more. If you're not pleased, let me know because rating bad does not result in a refund, there are better options. Rating now will not close this post nor prevent replying. Thanks Chris

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Customer reply replied 9 months ago
What does this mean in Layman's term? I am not very good with electrical problems!
Dodge Mechanic: Chris (aka-Moose), Technician replied 9 months ago

Are you going to be testing with a volt meter or test light?

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Customer reply replied 9 months ago
volt meter
Dodge Mechanic: Chris (aka-Moose), Technician replied 9 months ago

Using the diagram I sent and the pins I mentioned. Check those for power with the key on and the ones for no resistance to ground. You will use the DC voltage setting and the ohm setting.

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