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I've got a big problem with my '04 RAM 1500 Truck (4.7L

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Hello there, I've got a big...
Hello there,
I've got a big problem with my '04 RAM 1500 Truck (4.7L engine) w/o remote
Since 3-4 months now, it will not start anymore.
I just stopped to use it for over 3 weeks, and problem started.
Everytime I turn the key for ignition, it will only show Brake+Abs lights, for a short time.
Battery voltage is not shown anymore
The little square which shows which speed is in use, will not show either.
And the gearbox lever is "slack"
> Already tried 3 new batteries
> If I manually push the starter relay, I can hear it works
> I ordered a second used PCM and nothing changes
> Tried to find a circuit breaker but there's not.
> Diagnostic tool cannot make a connection with the car
Any solution ? Thank you VERY much!
Submitted: 2 years ago.Category: Dodge
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Answered in 2 hours by:
2/24/2016
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago
Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 28,309
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome! My name is ***** ***** I can assist you with your question. It sounds like the PCM is not awake with the key on. It may just be missing a power or a ground or perhaps it is being shorted out by a sensor. Have you checked the reference voltages with the key on?

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Customer reply replied 2 years ago
Hello Amedee,
I'm not really good at electricity but I've got tools.
I already bought another used PCM and I've not seen any change.
How can I be ensured that it is a PCM problem, how can I check the voltage?
Thanks
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello and sorry for the delay! You are going to first need to see if the computer is awake with the key on. I would turn the key on and check for a 5 volt reference to the TPS and MAP sensor. If there is no 5 volt reference, then the computer is not awake.

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Customer reply replied 2 years ago
Hello,
Where are the TPS and MAP sensors located?
When I turn the key for ignition I'm hearing a little "thick" coming from a relay in the engine compartment. But it's not located in the fuse box.
Also, I thought it could be the cluster. So I change the cluster with another RAM (2002 year), and it makes the things worse. My cluster is damaged and I cannot lock the doors anymore.
Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

It might be easier to talk on the phone. However I work all day today and won't be home until late tonight. I can talk on the phone then otherwise we can continue on this page if you would like to talk to you later. Thanks for your patience.

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

Hello! It's Amedee from just answer.

I am just checking in to see if you need any further assistance?

Let me know!

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Dodge Mechanic: Amedee, Dodge Technician replied 2 years ago

.

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Customer reply replied 2 years ago
I'm from belgium and it is very difficult for me to understand english sorry, I try to do my best with writing.
Can you provide me help with 5 volts measurement?
Or is that possible to get an electrical wiring diagram?
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