Shift Schedules
WARNING: This page is about a different car, the 2009 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
As mentioned earlier, the TCM has programming that allows it to select a variety of shift schedules. Shift schedule selection is dependent on the following:
- Shift lever position
- Throttle position
- Engine load
- Fluid temperature
- Software level
As driving conditions change, the TCM appropriately adjusts the shift schedule. Refer to the following chart to determine the appropriate operation expected, depending on driving conditions.
| Schedule | Condition | Expected Operation |
|---|---|---|
| Extreme Cold | Oil temperature below -27° C (16° F) | -Park, Reverse, Neutral and 1st and 3rd gear only in D position, 2nd gear only in Manual 2 or L |
| -No EMCC | ||
| Super Cold | Oil temperature between -24° C (-12° F) and -12° C (10° F) | - Delayed 2-3 upshift |
| - Delayed 3-4 upshift | ||
| - Early 4-3 coastdown shift | ||
| - High speed 4-2, 3-2, 2-1 kickdown shifts are prevented | ||
| -Shifts at high throttle openings willl be early. | ||
| - No EMCC | ||
| Cold | Oil temperature between -12° C (10° F) and 2° C (36° F) | -Shift schedule is the same as Super Cold except that the 2-3 upshifts are not delayed. |
| Warm | Oil temperature between 4° C (40° F) and 27° C (80° F) | - Normal operation (upshift, kickdowns, and coastdowns) |
| - No EMCC | ||
| - | Oil temperature between 27° C (80° F) and 115° C (240° F) | - Normal operation (upshift, kickdowns, and coastdowns) |
| Hot | - Normal EMCC operation | |
| Overheat | Oil temperature above 115° C (240° F) or engine coolant temperature above 118° C (244° F) | - Delayed 2-3 upshift |
| - Delayed 3-4 upshift | ||
| - 3rd gear FEMCC from 30-48 mph | ||
| - 3rd gear PEMCC above 35 mph | ||
| - Above 25 mph the torque converter will not unlock unless the throttle is closed or if a wide open throttle 2nd PEMCC to 1 kickdown is made |