Ramzaq
Senior Member
- Joined
- Oct 27, 2013
- Posts
- 443
- Reaction score
- 114
- Location
- Northern California
- Ram Year
- 2009 CC 4X4 3.55 Big Horn
- Engine
- Hemi 5.7
The Eco light is an indication that you are driving in an efficient manner, it is not an indication that the truck is operating in MDS mode. Saying that, MDS will only be active in ECO mode when certain conditions are met.
The PCM will activate the 4-cylinder mode when the following enabling conditions are met:
Low engine load
1200 to 3000 rpm
Vehicle speed between 12 mph and 90 mph
Battery voltage from 9 volts to 15 volts
Oil pressure from 15 psi to 147 psi
Oil temperature greater than 120 F
Engine coolant temperature from 158 to 248 F
Ambient temperature from 14 F to 248 F
No throttle position sensor or MDS faults
The PCM deactivates solenoids one cylinder at a time in the firing order. If the system is "on" for long periods of time, such as a long flat road with no stopping, the system will return to the 8-cylinder mode approximately every six minutes to maintain engine temperature. The PCM will also unlock the torque converter before the transition, to minimize the effect on driveability.
The PCM will activate the 4-cylinder mode when the following enabling conditions are met:
Low engine load
1200 to 3000 rpm
Vehicle speed between 12 mph and 90 mph
Battery voltage from 9 volts to 15 volts
Oil pressure from 15 psi to 147 psi
Oil temperature greater than 120 F
Engine coolant temperature from 158 to 248 F
Ambient temperature from 14 F to 248 F
No throttle position sensor or MDS faults
The PCM deactivates solenoids one cylinder at a time in the firing order. If the system is "on" for long periods of time, such as a long flat road with no stopping, the system will return to the 8-cylinder mode approximately every six minutes to maintain engine temperature. The PCM will also unlock the torque converter before the transition, to minimize the effect on driveability.