WHEN DRIVING ON THE HIGHWAY AND THE OVERDRIVE BUTTON IS RELEASED OVERDRIVE DOES NOT ENGAGE. SUGGESTION IS A PROBLEM WITH THE CONTROL UNIT (COMPUTOR) REF MC896944 31036 AS181. THIS STARTED AS A PROBLEM OF DROPPING IN AND OUT OF OVERDRIVE FOR SHORT PERIODS IN THE MIDDLE OF A JOURNEY WITHOUT TOUCHING THE OVERDRIVE BUTTON AND NOW HAS PROGRESSED TO NO OVERDRIVE AT ALL. OUR VEHICLE IS A MITSUBISHI ROSA 7m BUS (MOTORHOME)
3 things can be the problem: The button that you press for the overdrive may be damaged and the parts have come loose inside and that was why it would come in and out of overdrive (the whole assembly where the button is) The solenoid which is either inside the tranny or right outside the tranny may have been damaged . You might have 4 soleniods in total. Or your computer is bad. A bad computer will cause more effects to the car as you drive it though. Some mitsubishi engine have a safety thing that if there is something wrong with the tranny or parts there of, it will not allow you full control of options (similar to vanos engines and tranny's in bmw's) I hope this helps.
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Use your overdrive when driving at highway speeds on long stretches of road. Disable your overdrive (turn it off) when driving in the mountains and when towing something. When driving in traffic, use your own discretion as to whether or not to use overdrive, based on the amount of start & stop driving you are doing, and if you are attaining speeds high enough for overdrive to engage (above 40 m.p.h., generally).
I have a similar problem... No overdrive.. Will only work with a computer reset...disconnect battery... then overdrive works but eventually reverts back to no overdrive.... Computer based problem... My transmission was checked fine
All the ones I have come across have it. Basically it allows gearbox and engine to sync for greater fuel economy when you are not 'town driving' I.e doing more than 25 MPH. I've always left my overdrive engaged as you usually get better fuel economy. To try, take it onto a long open road, engage overdrive and bring her up to speed. Then turn off overdrive and watch your fuel gauge. You can pretty much see it drop.
this is really not a problem, overdrive will only be used if car speed is up to speed for it to engage and that is how its designed. If you pull a trailer or if you are in a hilly area and your car keeps shifting in and out of overdrive you should turn off untill more flater terrain, otherwise it doesn't hurt your vehicle.
Change the transmission valve body. Get one with the proper updates (Sonnax). There are many issues with these valve bodies. I had the same problem with mine except mine also released most of the transmission fluid while on the highway. I changed it out and now it runs like new. Also, you may want to have the transmission fluid flushed.
Tum the overdrive switch on for good fuel
economy and smooth driving. If engine braking
is needed in the "D" range or if repeated
upshifting and downshifting between the 3rd
and 4th gear is needed when climbing a
gentle slope, it is recommended that the
overdrive switch be tumed off. Tum the
overdrive switch back on immediately afterward.
When the overdrive switch is tumed on, the
transaxle will automatically upshift to the second,
third and overdrive gears. When the overdrive
switch is tumed off, the transaxle will not
upshift to the overdrive gear. For normal driving,
the selector lever should be left in the "D"
position and the overdrive switch tumed on.
If you need to accelerate rapidly, press the
accelerator pedal all the way to the floor. The
transaxle will automatically shift to a lower gear,
depending on the vehicle speed and load.
There isn't anything wrong with your car. This is perfectly normal. I have a 2000 ES300 as well as other people that I know and it operates in the same way. Overdrive doesn't mean the same thing for every car or transmission. In our case overdrive is simply a reference to the top gear which is 4th gear. When you switch overdrive off(which is depressing the button causing the O/D OFF dash light to illuminate,) the highest gear becomes 3rd because you turned 4th gear or overdrive off. The application scenario for this is usually mountainous terrain where a lot of uphill driving makes it more feasible not to up shift into 4th gear while ascending and descending. It will not switch back to overdrive or 4th gear until you re-engage it by turning the overdrive back on or repressing the button. Again, when the O/D OFF dash light is illuminated, overdrive which is 4th gear is off and the highest gear will then become 3rd. It will never shift into 4th gear while this light is illuminated or overdrive is off. When you press the button and the O/D OFF dash light is NOT illuminated overdrive is on and therefore it will shift into 4th gear as usual. This applies to all 97-2001 ES300's and probably any other car you drive tat exhibits this same type of change when overdrive is turned off.