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  #1  
Old 09-01-2013, 03:52 PM
cumminskid cumminskid is offline
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Join Date: Sep 2013
Location: Ohio
Age: 27
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Vehicle: 1994 Dodge Ram 2500
Trim Level: SLT
Color: Lime Green
Engine: 1994-1995 359ci (5.9L) Cummins 12-valve Diesel I6 175hp 420lb/ft(manual), 160hp 400lb/ft(auto)
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Default 1995 2500 47RH no OD

Hey all, I know this seems to be a common issue but my 1995 dodge ram 2500 cummins is not shifting into overdrive and the TC is not locking up in 3rd gear. Everyone says it is usually the TPPS but I have swapped it out with one from my other truck that shifts into OD with no issues and it did not change anything. I was wondering if anyone knew what all inputs the PCM gets to ground out the OD and TC lock up solenoids. I have 12 volts to them and they ohm out ok but they aren't getting the ground signal from the PCM. Any advice would be appreciated.

Last edited by cumminskid; 09-01-2013 at 05:22 PM.
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  #2  
Old 09-06-2013, 12:29 PM
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ramvan2500 ramvan2500 is offline
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Vehicle: 1995 Dodge Ram B2500 Van
Trim Level: SLT - 2500
Color: Deep Molten Pearl Coat, Silver, Grey
Engine: 1994-2001 318ci (5.2L) Magnum V8 220hp
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Quote:
Originally Posted by cumminskid View Post
Hey all, I know this seems to be a common issue but my 1995 dodge ram 2500 cummins is not shifting into overdrive and the TC is not locking up in 3rd gear. Everyone says it is usually the TPPS but I have swapped it out with one from my other truck that shifts into OD with no issues and it did not change anything. I was wondering if anyone knew what all inputs the PCM gets to ground out the OD and TC lock up solenoids. I have 12 volts to them and they ohm out ok but they aren't getting the ground signal from the PCM. Any advice would be appreciated.
Look into the OD switch and relays, sometimes they short out and cause all sorts of nasty problems. Also if you aren't getting a signal from the PCM then I would seriously check between the OD switch circuit and a possibly PCM issue.
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  #3  
Old 10-02-2013, 11:18 AM
cumminskid cumminskid is offline
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Join Date: Sep 2013
Location: Ohio
Age: 27
Posts: 5
Gender: Male
Vehicle: 1994 Dodge Ram 2500
Trim Level: SLT
Color: Lime Green
Engine: 1994-1995 359ci (5.9L) Cummins 12-valve Diesel I6 175hp 420lb/ft(manual), 160hp 400lb/ft(auto)
Rep Power: 0
Rep:10
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I was going to try to use the OD switch from my 1994 but it only had 4 prongs and the truck with the issue has 5. do you know what the difference is? went ahead and put the PCM from problem truck in my 94 and it shifted correctly. what relays should i check? I don't remember seeing any labeled in the power distribution center under the hood. Thanks for the help!
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  #4  
Old 10-02-2013, 01:28 PM
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ramvan2500 ramvan2500 is offline
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Vehicle: 1995 Dodge Ram B2500 Van
Trim Level: SLT - 2500
Color: Deep Molten Pearl Coat, Silver, Grey
Engine: 1994-2001 318ci (5.2L) Magnum V8 220hp
Rep Power: 4
Rep:127
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Quote:
Originally Posted by cumminskid View Post
I was going to try to use the OD switch from my 1994 but it only had 4 prongs and the truck with the issue has 5. do you know what the difference is? went ahead and put the PCM from problem truck in my 94 and it shifted correctly. what relays should i check? I don't remember seeing any labeled in the power distribution center under the hood. Thanks for the help!
i don't know what the difference is, what the extra prong is for... i used to have access to all of the electrical schematics but i do not anymore.


let me get back to you later this week, i will try to find out. i never ran into this issue before.
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  #5  
Old 10-02-2013, 01:35 PM
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ramvan2500 ramvan2500 is offline
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Vehicle: 1995 Dodge Ram B2500 Van
Trim Level: SLT - 2500
Color: Deep Molten Pearl Coat, Silver, Grey
Engine: 1994-2001 318ci (5.2L) Magnum V8 220hp
Rep Power: 4
Rep:127
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Quote:
Originally Posted by cumminskid View Post
I was going to try to use the OD switch from my 1994 but it only had 4 prongs and the truck with the issue has 5. do you know what the difference is? went ahead and put the PCM from problem truck in my 94 and it shifted correctly. what relays should i check? I don't remember seeing any labeled in the power distribution center under the hood. Thanks for the help!
oh, the switch acts as a relay. the od and switch is completely controlled by the pcm.
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  #6  
Old 10-02-2013, 01:52 PM
cumminskid cumminskid is offline
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Vehicle: 1994 Dodge Ram 2500
Trim Level: SLT
Color: Lime Green
Engine: 1994-1995 359ci (5.9L) Cummins 12-valve Diesel I6 175hp 420lb/ft(manual), 160hp 400lb/ft(auto)
Rep Power: 0
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I'll do a little research on it. Thanks again for the help!
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  #7  
Old 10-02-2013, 08:19 PM
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ramvan2500 ramvan2500 is offline
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Trim Level: SLT - 2500
Color: Deep Molten Pearl Coat, Silver, Grey
Engine: 1994-2001 318ci (5.2L) Magnum V8 220hp
Rep Power: 4
Rep:127
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Quote:
Originally Posted by cumminskid View Post
I'll do a little research on it. Thanks again for the help!
I am going to do some looking into this also because I am curious. You could just find out the original part number by going to the dealers parts department and they have all of the parts books and all that stuff. I have used that as a resource before in the past.
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  #8  
Old 10-03-2013, 09:24 AM
cumminskid cumminskid is offline
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Join Date: Sep 2013
Location: Ohio
Age: 27
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Vehicle: 1994 Dodge Ram 2500
Trim Level: SLT
Color: Lime Green
Engine: 1994-1995 359ci (5.9L) Cummins 12-valve Diesel I6 175hp 420lb/ft(manual), 160hp 400lb/ft(auto)
Rep Power: 0
Rep:10
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Default

Just did some checks with my multimeter between my two trucks. There is an extra orange ground wire on my 95 (the truck with the issue) the wires are at different locations in the plugs of both trucks but have the same functions. The blue/white wire remains 12 volts with OD on or off (I'm guessing this is for the OD light), the black/orange wire remains ground with OD on or off, the orange/white wire remains 8.75 Volts with OD on or off, and the orange/black and green/orange wires go from 12 volts with OD on to 0 volts with it off. The orange wire that is on the 95 but not on the 94 is a ground with OD on or off. So it seems like the switch is working properly in the 95.
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  #9  
Old 10-03-2013, 11:19 AM
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ramvan2500 ramvan2500 is offline
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Join Date: Apr 2011
Location: Florida USA
Posts: 1,828
Gender: Male
Vehicle: 1995 Dodge Ram B2500 Van
Trim Level: SLT - 2500
Color: Deep Molten Pearl Coat, Silver, Grey
Engine: 1994-2001 318ci (5.2L) Magnum V8 220hp
Rep Power: 4
Rep:127
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Quote:
Originally Posted by cumminskid View Post
Just did some checks with my multimeter between my two trucks. There is an extra orange ground wire on my 95 (the truck with the issue) the wires are at different locations in the plugs of both trucks but have the same functions. The blue/white wire remains 12 volts with OD on or off (I'm guessing this is for the OD light), the black/orange wire remains ground with OD on or off, the orange/white wire remains 8.75 Volts with OD on or off, and the orange/black and green/orange wires go from 12 volts with OD on to 0 volts with it off. The orange wire that is on the 95 but not on the 94 is a ground with OD on or off. So it seems like the switch is working properly in the 95.
Excellent work! Good thing you did this because now I know it. I deal with the mechanical repairs not so much electrical. Anyways, if the switch is working and your OD still kicks off, then it might be the PCM itself or it may be receiving a false signal. I would start out by checking the signaling from the transmission, things such as the temperature sensors mostly. This is actually a common problem and not just with the Diesel, it seems to be a big problem with the gas trucks. As far as I know from experience that generally replace some sensors helps but on the 95 the sensor is going to be separate. Also there aren't any real known repairs because so many things can cause this problem and so many different ways to correct.
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  #10  
Old 10-03-2013, 11:57 AM
cumminskid cumminskid is offline
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Join Date: Sep 2013
Location: Ohio
Age: 27
Posts: 5
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Vehicle: 1994 Dodge Ram 2500
Trim Level: SLT
Color: Lime Green
Engine: 1994-1995 359ci (5.9L) Cummins 12-valve Diesel I6 175hp 420lb/ft(manual), 160hp 400lb/ft(auto)
Rep Power: 0
Rep:10
cumminskid is on a distinguished road
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I'll have to do some digging and find my sensor from my 94. I put the temp sensor for my trans temp gauge in its place and wired in a resistor so it would shift into OD. Thanks again for all the help. I'm hoping to get this going before snow starts to hit. My 94 is a two wheel drive and I need 4 wheel drive in my neck of the woods
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