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My 98 ram 2500 with a 12 valve was not starting in cold

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Hello, My 98 ram 2500...
Hello, My 98 ram 2500 with a 12 valve was not starting in cold temperatures. I found the heater grid relays were not functioning. Replaced them and they would function but for only 1 second and ide have to cycle the key again. So after trying to make them work with a 12v jumper wire the gauge cluster quit working. . so i plugged in my scan tool to the obd2 and no signal. Did the gauge cluster test and the gauges did full sweep. Ended up finding a used pcm from a 97 and switched. The heater grids now function for adequate time but still no gauges. Is the wiring different going to the cluster as 97 gauges were different style. Oh ya and now my obd2 shows all gauges working on the scanner. Rpm speed coolant temp etc..
Submitted: 11 months ago.Category: Dodge
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Answered in 11 minutes by:
8/6/2017
Dodge Mechanic: Chris, Shop Foreman replied 11 months ago
Chris
Chris, Shop Foreman
Category: Dodge
Satisfied Customers: 14,866
Experience: Dodge/Cummins and Chrysler Certified Master Tech
Verified

Hello and welcome to just answer. The PCM on a 97 and 98 send gauge info over the CCD bus network to the cluster. They both use this network. Let me pull up the wiring diagrams for the 2 trucks and see if there is any difference. I will be back asap.

Chris

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Dodge Mechanic: Chris, Shop Foreman replied 11 months ago

Ok, after looking at the diagrams between the 2 different years, I see that the CCD bus on the 97 is in terminals 27 and 29. On the 98 12 valve, they are in 28 and 30. The 98 had the SCI transmit and receive wires in 27 and 29. So you will need to get a 97 PCM for this to work properly.

Chris

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Dodge Mechanic: Chris, Shop Foreman replied 11 months ago

Hello, just checking back to see if you received my last reply. If not, I will send it again.

Chris

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Dodge Mechanic: Chris, Shop Foreman replied 11 months ago

I hope that my answer and information was helpful, and if so would you kindly take a moment and rate my service using the just answer star rating system? I would really appreciate it. I will still be able to help you out even after you rate me. Thank you! Chris

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