Shift Fork Preselection
Locking a second gear to the output shaft is called preselection. The SHIFT FORK PRESELECTION - VEHICLE MOVING table lists the driving conditions under which preselection occurs and which gear is preselected.
| Autostick | Drive | ||
|---|---|---|---|
| Active Gear | Preselected Gear | Active Gear | Preselected Gear |
| 1st | 2nd | 1st | 2nd |
| 2nd | 3rd | 2nd | 0 |
| 3rd | 2nd | 3rd | 0 |
| 4th | 3rd | 4th | 0 |
| 5th | 4th | 5th | 0 |
| 6th | 0 | 6th | 0 |
SHIFT FORK PRESELECTION - VEHICLE MOVING
The SHIFT FORK PRESELECTION - VEHICLE STOPPED table lists the shifter and engine conditions under which preselection occurs when the vehicle is stopped.
| Engine Off | Engine Running | ||
|---|---|---|---|
| Shifter Position | Preselected Gears | Shifter Position | Preselected Gears |
| P | Reverse and 2nd | P | Reverse and 2nd |
| R | Reverse and 2nd | R | Reverse and 2nd |
| N | Reverse and 2nd | N | Reverse and 2nd |
| D | Reverse and 2nd | D | 1st and 2nd |
| Autostick™ | Reverse and 2nd | Autostick™ | 1st and 2nd |
SHIFT FORK PRESELECTION - VEHICLE STOPPED
COMMON PROBLEM CAUSES
The majority of transaxle malfunctions are a result of
- Insufficient lubrication
- Incorrect lubricant
- Mis-assembled or damaged internal components
- Improper operation
LOW LUBRICANT LEVEL
Insufficient transaxle lubricant is usually the result of leaks, or inaccurate fluid level check or refill method. Vehicle must be level to accurately check fluid level. Leakage is evident by the presence of oil around the leak point. If leakage is not evident, the condition is probably the result of an underfill.
If air-powered lubrication equipment is used to add fluid to the MPS6 transaxle, be sure the equipment is properly calibrated. Equipment out of calibration can lead to an under fill condition. Refer to Standard Procedure in this service information.
CLEANING
Clean the gears, bearings, shafts, synchronizers, thrust washers, oil feeder, shift mechanism, gear case, and bellhousing. Do not use solvent to clean sealed bearings. Dry all parts except the bearings with compressed air. Allow the bearings to either air dry or wipe them dry with clean shop towels.