Test Procedure
- Check for shift point, shift pattern and shift shock. Shift selector to "D" range. Accelerate vehicle at half and full throttle, ensure 1-2, 2-3 and 3-4 upshifts, downshifts and lock-up are obtained. Note speed and compare with SHIFT SPEED CHART. See Fig 1 . Note upshifts for shift shock and slippage.
- When driving in OD, shift to "S" and ensure 4-3 downshift occurs immediately.
- Select HOLD mode. Check for 2-3 upshifts and downshifts. Check for lock-up and no 1st or "OD".
- Decelerate vehicle. Check for engine braking in 3rd and 2nd gears when throttle is open 1/8 or less.
- Drive in 3rd and 4th gear to ensure no unusual noise or vibration is heard. Check torque converter, drive shaft(s) and differential for source of unusual noise. Ensure kickdown operates properly and shift points match SHIFT SPEED CHART. See Fig 1 .
NOTE:
POWER or NORMAL driving mode is automatically selected according to throttle opening. O/D does not operate when ATF temperature is below 50°F (10°C) or when cruise control is operating with a 5 MPH difference between preset cruise speed and vehicle speed. TCC lock-up does not operate when throttle is closed with vehicle below 74 MPH or when ATF is below 104°F (40°C).