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.
Garage is empty, add now
Vehicle: It changes regularly.
[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.
2006 Hemi Durango Limited.