Transmission Shift Schedules
The PCM is programmed to allow 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 calibration level
As driving conditions change, the PCM 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 at start-up below -27° C (-16° F) | Park, Reverse, Neutral and 2nd gear only (prevents shifting which may fail a clutch with frequent shifts) |
| Cold | Oil temperature at start-up above -24.5 °C (-12° F) and below 2° C (36° F) | - Delayed 2-3 upshift (approximately 22-31 mph) |
| - Delayed 3-4 upshift (45-53 mph) | ||
| - Early 4-3 costdown shift (approximately 30 mph) | ||
| - Early 3-2 coastdown shift (approximately 17 mph) | ||
| - High speed 4-2, 3-2, 2-1 kickdown shifts are prevented | ||
| - No EMCC | ||
| Warm | Oil temperature at start-up above 2° C (36° F) and below 27° C (80° F) | - Normal operation (upshift, kickdowns, and coastdowns) |
| - No EMCC | ||
| Hot | Oil temperature at start-up above 27° C (80° F) | - Normal operation (upshifts, kickdowns, and coastdowns) |
| - Full EMCC, no PEMCC except to engage FEMCC (except at closed throttle at speeds above 70-83 mph) | ||
| Overheat | Oil temperature above 115.5° C (240° F) or engine coolant temperature above 118° C (244° F) | - Delayed 2-3 upshift (25-32 mph) |
| - Delayed 3-4 upshift (41-48 mph) | ||
| - 3rd gear FEMCC from 30-48 mph | ||
| - 3rd gear PEMCC from 27-31 mph | ||
| Super Overheat | Oil temperature above 127° C (260° F) | - All "Overheat" shift schedule features apply |
| - 2nd gear PEMCC above 22 mph | ||
| - Above 22 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 |