Harsh Downshifts

Symptom:
* HARSH DOWNSHIFTS

POSSIBLE CAUSES
ENGINE PERFORMANCE 1) STICKY TPS 2) STUCK IAC MOTOR (HIGH IDLE SPEED) 3) ENGINE COOLANT TEMPERATURE TOO LOW
TCM SOFTWARE NOT UP TO DATE - CHECK FOR LATEST TSB
DEFECTIVE SOLENOID ASSEMBLY
VALVE BOY MALFUNCTION - OR L-R SWITCH VALVE STICKING
CLUTCH AND/OR ACCUMULATOR SEAL LEAKAGE
UNDERDRIVE CLUTCH VOLUME TOO HIGH (4-3 COASTDOWN ONLY)
UD CLUTCH CLEARANCE TOO LOW (UD CLUTCH VOLUME WILL NOT LEARN TO COMPENSATE)