no spark no fuel no guages
Champion
Joined: Jul 2011
Posts: 4,895
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From: Gilbert, Arizona
I’m no expert on this subject but didn’t I read on this forum if you swap out the computer with another one from some other Dakota that some code in the thing doesn’t match the rest of the system it communicates with it will never run? It will need some reprograming to work with your system?
I’m just tossing something out there this stuff is above me
I’m just tossing something out there this stuff is above me
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Registered User
Joined: Nov 2012
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What should i be looking for that might short the computer?
The computer is only putting out 3v to the crank sensor. Does that mean that the crank sensor is the unit that shorted the circuit?
The computer is only putting out 3v to the crank sensor. Does that mean that the crank sensor is the unit that shorted the circuit?
Section Moderator
Joined: Dec 2010
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From: MA
I believe it should be a 5v signal.
The crank and cam sensors, at least in later years, share the same power supply. Both can fail.
Any damage to the bus or a bad module, ABS, TCM, CTM, etc, can cause the "no bus."
The crank and cam sensors, at least in later years, share the same power supply. Both can fail.
Any damage to the bus or a bad module, ABS, TCM, CTM, etc, can cause the "no bus."
Section Moderator
Joined: Dec 2010
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From: MA
All the fuses are good, correct?
Start with the cam/crank sensors. They're a much more common problem. Unhook them then see if you can get into the PCM to read codes with your reader.
It's unlikely the other modules would "fry" the PCM, it does have protection. They could short out the bus, as could damaged wiring, then you'd get "no bus."
Basically you're troubleshooting a computer.
Start with the cam/crank sensors. They're a much more common problem. Unhook them then see if you can get into the PCM to read codes with your reader.
It's unlikely the other modules would "fry" the PCM, it does have protection. They could short out the bus, as could damaged wiring, then you'd get "no bus."
Basically you're troubleshooting a computer.
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UPDATE
I have recieved a new computer. I placed the new computer int he truck and check for signal to the test unit and checked for key on signal to fuel pump all good.....THEN I proceeded to crank the truck over and again it fried the computer....No fuel signal and no link to the computer.....WTF I am lost what do I do next.....Anyone interested in a 1997 Dodge Dakota?
HELP
I have recieved a new computer. I placed the new computer int he truck and check for signal to the test unit and checked for key on signal to fuel pump all good.....THEN I proceeded to crank the truck over and again it fried the computer....No fuel signal and no link to the computer.....WTF I am lost what do I do next.....Anyone interested in a 1997 Dodge Dakota?
HELP
Section Moderator
Joined: Dec 2010
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From: MA
All you can do is check the wiring, very carefully.
You're diagnosing a computer. To do so you're going to need more tools, like a DRB and find out what is happening on the CCD bus. It can help pinpoint the modules/sensors and what is happening.
Take it to a dealer.
You're diagnosing a computer. To do so you're going to need more tools, like a DRB and find out what is happening on the CCD bus. It can help pinpoint the modules/sensors and what is happening.
Take it to a dealer.
Professional
Joined: Jan 2012
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there are so many splices back to the PCM it would make you sick look at one of the wireing diagrams you'll see dodge is notorious for wrapping up splices with a type of hockey tape if I can call it that. it gets wet and traps the water in it corrodes and wrecks splices. it's not fun to try and track that **** down