Poor Acceleration; Stall Speed Low In D, D3, S, 2, And 1 (D, D3, And S In 1St And 2nd) (A/T)

Poor acceleration; stall speed low in D, D3, S, 2, and 1 (D, D3, and S in 1st and 2nd)

Diagnostic Procedure:

1. Shift solenoid valve D defective

2. Torque converter one-way clutch defective

3. Engine output low

4. Torque converter clutch piston defective

5. Lock-up shift valve defective

Also check for:

- Check for a stored DTC, and check for loose connections.
- Test the shift solenoid valve function with the HDS.
- Inspect the O-rings, and check the shift solenoid valve for seizure.
- Replace the torque converter assembly.
- Check the lock-up shift valve in the regulator valve body for free movement, and check the valve spring for wear and damage.
- Check the engine control system.