1999 Mitsubishi Eclipse automatic transmission

Tiny
BILL57
  • MEMBER
  • 1999 MITSUBISHI ECLIPSE
  • 2.0L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Transmission first started to act like it was slipping. Primarily coming down a steep incline or bridge while in cruise control. Never going up a steep incline and not while driving without using the cruise control. I fushed the entire transmission with Mobil 1 fluid which showed it was for my transmission(replaces diamond sp III). Also changed the filter. Car ran fine for over 2 months and started doing the same thing again but also on flat surfaces the rpm's would ramp up and down while driving as if the transmission was slipping, This would not happen constantly but every now and then. Finally one day it cleared up for the day and the next day I drove about 2 miles from the house and on flat ground it started slipping constantly and wouldn't shift gears. I pulled to the side of the road, shut the car off and started it again, put it in drive and the car wouldn't move at all in any position including reverse. Had the car towed to the house. I was told it could possilbly be the transmission control solenoid. What's your opinion?
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Wednesday, December 11th, 2013 AT 1:56 PM

5 Replies

Tiny
SATURNTECH9
  • EXPERT
Could be the pump etc also do you have any codes in the computer?
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Wednesday, December 11th, 2013 AT 2:05 PM
Tiny
BILL57
  • MEMBER
I'm not sure if some of the codes were old or not but the first codes that showed up were P0700-transmission control malfunction, P1784 manuf. Specific DTC which I can't find what this refers to. P1782 manuf. Specific DTC which I can't find what this refers to either. P0732 gear 2 ratio incorrect, P1781 manuf. Specific DTC can't find reference to this one and P0734 gear 4 ratio incorrect. I then cleared the codes with the code analyzer and checked it out again and only two codes re-appeared, P0700 transmission control malfunction and P1784 manuf. Specific DTC.
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Wednesday, December 11th, 2013 AT 2:40 PM
Tiny
SATURNTECH9
  • EXPERT
The 1784 is a code for the reverse pressure switch and the code 1782 is for the 2-4 pressure switch with those with the 2nd and 4th gear codes and the car not moving I would suspect you have a pressure issue.I doubt the reverse and 2-4 pressure switch failed at the same time. I would do a transmission reverse pressure etc pressure tests to start with.
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Wednesday, December 11th, 2013 AT 3:35 PM
Tiny
BILL57
  • MEMBER
How do I conduct this test?
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Thursday, December 12th, 2013 AT 7:25 AM
Tiny
SATURNTECH9
  • EXPERT
You need to get a transmission pressure tester kit and there is plugs for different tests you remove and screw the adapters in to test the pressures. Its most likely going to be a internal failure. When a transmission wont move forward or backwards thats usually what it ends up being.
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Thursday, December 12th, 2013 AT 9:11 AM

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