What does a PCM control? - Dodge Durango Forum and Dodge Dakota Forums
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post #1 of Old 03-20-2009, 11:37 PM Thread Starter
trevor
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What does a PCM control?

Hopefully you guys can help me out.

Long story short, I have "found" a 5.9 r/t pcm from a 99 dakota, to put in my 99 4x4 dakota.

I'd just like to know what im going to be messing with computer wise. So what things are controlled by the pcm, specifically one from a 1999 dakota?

Keyless entry, overhead computer, abs, security, etc.?

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post #2 of Old 03-20-2009, 11:42 PM
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Do you mean a mopar performance PCM? or just one from a 5.9 RT?

Fuel injectors,ignition, overhead console, gauges, odometer, probably more than that.
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post #3 of Old 03-21-2009, 01:03 AM
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The only thing I would worry about that PCM not doing that yours does is alter the shift points when in 4lo. If you use 4lo, then you might want to reconsider using that PCM, as not having those revised shift points will fry your clutches.

I suggest finding a Durango R/T, as those will have the revised programming for using 4lo.
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post #4 of Old 03-21-2009, 01:14 AM Thread Starter
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Quote:
Originally Posted by jmaack727 View Post
Do you mean a mopar performance PCM? or just one from a 5.9 RT?

Fuel injectors,ignition, overhead console, gauges, odometer, probably more than that.
Just one from a 5.9 R/T...so not the keyless entry? How do guys add the overhead computer, or does every pcm allow for control for it?

Quote:
Originally Posted by HemiDak View Post
The only thing I would worry about that PCM not doing that yours does is alter the shift points when in 4lo. If you use 4lo, then you might want to reconsider using that PCM, as not having those revised shift points will fry your clutches.

I suggest finding a Durango R/T, as those will have the revised programming for using 4lo.
How does the PCM control the shift points, is my truck not controlled by a cable...opposed to electronically controlled?

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post #5 of Old 03-21-2009, 01:19 AM
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Quote:
Originally Posted by trevor View Post
Just one from a 5.9 R/T...so not the keyless entry? How do guys add the overhead computer, or does every pcm allow for control for it?



How does the PCM control the shift points, is my truck not controlled by a cable...opposed to electronically controlled?
Search some of my threads i made a how to post for instaslling the computer. As for keyless entry I doubt it. I have heard that stuff is in the CTM

I would be concerned with what josh said previously more though.
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post #6 of Old 03-21-2009, 01:32 AM Thread Starter
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Quote:
Originally Posted by jmaack727 View Post
Search some of my threads i made a how to post for instaslling the computer. As for keyless entry I doubt it. I have heard that stuff is in the CTM

I would be concerned with what josh said previously more though.
I searched and found this:
Quote:
Originally Posted by jmaack727 View Post
Suposedly they say its only if it comes with fogs, power locks, and windows. They say the CTM has to have those options programed. This isnt true, as I have installed one in a 98 with no power anything.
So basically you found that it could be put into a base truck with no problem? My truck has power locks and windows, with no fogs and has the overhead comp.

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post #7 of Old 03-21-2009, 02:14 AM
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Quote:
Originally Posted by trevor View Post
I searched and found this:


So basically you found that it could be put into a base truck with no problem? My truck has power locks and windows, with no fogs and has the overhead comp.
My other truck, not the one i have now was a low optioned SLT power windows and PL.

I installed the fogs, and the overhead computer. It worked flawlessly.

I would say you would still be fine depending on the shifting while in 4wd. As for the ABS it is a different computer than the one you would be replacing.
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post #8 of Old 03-21-2009, 02:15 AM Thread Starter
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Quote:
Originally Posted by HemiDak View Post
I suggest finding a Durango R/T, as those will have the revised programming for using 4lo.
There is no such thing as a 99 Durango R/T...4x4 ram work?

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post #9 of Old 03-21-2009, 02:16 AM
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Quote:
Originally Posted by trevor View Post
There is no such thing as a 99 Durango R/T...4x4 ram work?
99 5.9 and 4wd would be fine too.
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post #10 of Old 03-21-2009, 02:16 AM Thread Starter
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Quote:
Originally Posted by jmaack727 View Post
My other truck, not the one i have now was a low optioned SLT power windows and PL.

I installed the fogs, and the overhead computer. It worked flawlessly.

I would say you would still be fine depending on the shifting while in 4wd. As for the ABS it is a different computer than the one you would be replacing.
Thanks, that's what i like to hear!

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post #11 of Old 03-21-2009, 04:15 AM
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Quote:
Originally Posted by trevor View Post
How does the PCM control the shift points, is my truck not controlled by a cable...opposed to electronically controlled?
I tried to think of a good way to explain it, but I think this excerpt from a FSM does a pretty good job. This is for a 46RE, but it applies to the other RE transmissions.

Quote:
TRANSFER CASE LOW RANGE OPERATION
On four-wheel drive vehicles operating in low
range, the engine can accelerate to its peak more
rapidly than in Normal range, resulting in delayed
shifts and undesirable engine flare. The low range
governor pressure curve is also higher than normal
to initiate upshifts sooner. The PCM compares electronic
vehicle speed signal used by the speedometer
to the transmission output shaft speed signal to
determine when the transfer case is in low range.
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post #12 of Old 03-21-2009, 04:23 AM
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Quote:
Originally Posted by trevor View Post
There is no such thing as a 99 Durango R/T...4x4 ram work?
The R/T Durango came out in 99.
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post #13 of Old 03-21-2009, 09:35 AM Thread Starter
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Quote:
Originally Posted by HemiDak View Post
The R/T Durango came out in 99.
everything I have read says it was a mid 2000 option. Finding a 99 Durango r/t pcm is going to be quite hard. I bet a 99 4x4 ram would be easier to come by...in-fact we have a 1999 ram 2500 with a 360...but I bet my dad wouldnt let me take its pcm...

so a 2wd pcm will cause the motor to "hang up" in gear when in 4 lo, when it needs a more positive shift?

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