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  #1  
Old 10-21-2013, 07:28 PM
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skytop skytop is offline
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Default Display showing MDS cylinder deactivation mode and your driving manner

Setting for The Multiple Displacement System (MDS) that provides cylinder deactivation and showing the economy of your driving style.

The "ECO" setting is found through the UConnect settings. The setting is an on/off "Fuel Saver Display in Cluster." See page 297 of the owners manual
The ECO indicator is not an indicator for whether the MDS is on or not, its just an indicator that tells you when your engine is running at its optimal performance level.
ECO indicator has nothing to do with MDS, MDS is triggered by different variables, you can disable MDS and still get the ECO light to trigger on, like the 4.7L engine, no MDS, it has only the fancy vacuum sensor that turns the light in the dash on when it senses the engine is not forcing and at that point burning its fuel optimally.
From the Manual
"ECO / ECO-ON (Fuel Saver Indicator) — If Equipped
The ECO-ON indicator will illuminate when you are
driving in a fuel efficient manner and can be used to
modify driving habits in order to increase fuel economy.
The ECO display will toggle between ECO and ECO-ON
depending on driving habits and vehicle usage. Press the
Odometer / Trip Odometer / ECO (Fuel Saver Indicator)
button to change the display from odometer to either of
the two trip odometer settings or the “ECO” display"
You can turn this option on or off in EVIC .

This combined info is from another location in ramforumz.
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  #2  
Old 10-21-2013, 07:59 PM
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Since the ECO or Fuel Saver indication is not a definite indication of 4 cylinder mode you can make a modification of your own if you so desire. Sarguy01 on Dodge Forum . com created this mod some time ago in 2009.


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[IMG]http://***************/forum/images/icons/icon1.gif[/IMG] The Revised MDS Light How-To.
If you do this and break something, or if any information posted is wrong, it is not my fault.

The MDS uses four lifters that "lock out" and keep the valves from opening and closing on the cylinders that are disabled. The wires that can be used are as follows. Cylinder 1 = BR/WHT. Cylinder 4 = BR/LB. Cylinder 6 = BR/DG. Cylinder 7 = BR/OR. The harness plug can be found at the back of the [COLOR=blue !important][COLOR=blue !important]intake [COLOR=blue !important]manifold[/COLOR][/COLOR][/COLOR] on the drivers side.

I just took a solid core wire and pushed it into the back side of the connector. I know this is not the preferred method, but it allows me to take it off when I want to go to the dealer for something. I don't want them to ask me any questions.

First. Loosen the worm clamp and pull off the intake tube.


Second. Slide the red button out and then press down the black tab shown by the yellow arrow and pull the connector from the sensor. Then, loosen the worm clamp and remove the intake tube and set aside.


Third. Pull off the [COLOR=blue !important][COLOR=blue !important]engine [COLOR=blue !important]cover[/COLOR][/COLOR][/COLOR]. It just pops off, there are no screws or bolts. Then, find the wire of choice (Cylinder 1 = BR/WHT. Cylinder 4 = BR/LB. Cylinder 6 = BR/DG. Cylinder 7 = BR/OR) in the connector shown. The wire goes underneath the intake manifold into one of the MDS connectors. I pushed a solid wire into the connector shown, on the back where the wire enters it. I did not solder or cut anything. I want this to be easily removable.


This is a picture of the wire in the connector.


Fourth. I drilled a small hole and put an LED in there. I wired one side to the LED and grounded the other side. This panel pops out after the three screws are removed.


I ran the wire through the nipple underneath where the big bundle of wires goes through the firewall. I poked a small hole with my knife.


I grounded the LED with this bolt.


I drove from Iowa to New Jersey and at 75 mph and it came on a few times when going down hill.


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Last edited by Ramzaq; 10-21-2013 at 08:02 PM.
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  #3  
Old 10-22-2013, 10:51 AM
Jim45498 Jim45498 is offline
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On some you can turn the ECO light on or off but that is the light only.
The motor will still go into 4cyl. when less power is needed.
This is to save on fuel.
It may NOT go into eco if you shift it yourself with the + or - on the shifter or use the tow-haul mode.

If you just put it in D and go, it will always go into ECO if situation lets it do so (such as steady speed on level ground or downhill) .

This has been a misunderstanding topic for many.
The reason I posted this is because a Ram tech explained this on another forum.

This might help MDS or ECO (same thing)


Multi-Displacement System

Chrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2004 on the 5.7 L modern Hemi V8. Like Mercedes-Benz's Active Cylinder Control, General Motors' Active Fuel Management, and Honda's Variable Cylinder Management, it deactivates four of the V8's cylinders when the throttle is closed or at steady speeds

Last edited by Jim45498; 10-22-2013 at 11:04 AM.
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Old 10-22-2013, 12:01 PM
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I don't need a light... I can feel it.
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  #5  
Old 10-22-2013, 01:35 PM
Jim45498 Jim45498 is offline
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Quote:
Originally Posted by gwilburn View Post
I don't need a light... I can feel it.
I agree with you
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Old 10-22-2013, 02:05 PM
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Quote:
Originally Posted by Jim45498 View Post
On some you can turn the ECO light on or off but that is the light only.
The motor will still go into 4cyl. when less power is needed.
This is to save on fuel.
It may NOT go into eco if you shift it yourself with the + or - on the shifter or use the tow-haul mode.

If you just put it in D and go, it will always go into ECO if situation lets it do so (such as steady speed on level ground or downhill) .

This has been a misunderstanding topic for many.
The reason I posted this is because a Ram tech explained this on another forum.

This might help MDS or ECO (same thing)
MDS and ECO are not that same thing as the OP stated. On the 5.7's it is a fair assumption to say that when the ECO light is on that MDS is active as well but that is not necessarily true 100% of the time. They still are two separate systems in the truck. The ECO light can be on without MDS being active.

If it were true that the ECO light was solely connected to MDS to let the driver know when he was running on 4 cylinders, the 4.7's wouldn't have an ECO light.
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  #7  
Old 10-22-2013, 09:22 PM
Jim45498 Jim45498 is offline
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Quote:
Originally Posted by brandonjansen View Post
MDS and ECO are not that same thing as the OP stated. On the 5.7's it is a fair assumption to say that when the ECO light is on that MDS is active as well but that is not necessarily true 100% of the time. They still are two separate systems in the truck. The ECO light can be on without MDS being active.

If it were true that the ECO light was solely connected to MDS to let the driver know when he was running on 4 cylinders, the 4.7's wouldn't have an ECO light.
I thought we were talking 5.7Hemi only

But I do know my truck goes into MDS (4cyl.) when the ECO light goes on.

Just like GWILBURN says "you can feel it"

Last edited by Jim45498; 10-22-2013 at 09:25 PM.
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Old 10-23-2013, 03:38 PM
Ramzaq Ramzaq is offline
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I have had my truck for 5 years and I have a difficult time hearing when it is in 4 cylinder mode, I feel it go into the next gear or overdrive but rarely when it drops to 4. My exhaust is pretty loud and I can hear the drone inside but the sound really isn't much different.

If I am cruising along and increase the pedal till the light disappears it is pretty much seemless in feel and sound.
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Old 01-09-2014, 04:48 PM
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Quote:
you can disable MDS
Can the MDS, in fact, be easily disabled? I do wish that there was a display on the dash to indicate whether the MDS was activated or not (as there is, for instance, in the last Chrysler Aspen vehicles).

Last edited by SwampWolf; 01-09-2014 at 04:52 PM.
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Old 01-09-2014, 05:08 PM
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Quote:
Originally Posted by SwampWolf View Post
Can the MDS, in fact, be easily disabled? I do wish that there was a display on the dash to indicate whether the MDS was activated or not (as there is, for instance, in the last Chrysler Aspen vehicles).
Turning on the tow/haul button or using the manual shift button to put it into 5th will disable the MDS. Otherwise you need a tuner to fully disable it.
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