TL* THE CONTACT OWNS A 2004 TOYOTA SIENNA. THE CONTACT STATED THAT WHILE DRIVING 35 MPH, THE VSC AND THE TRACTION OFF LIGHT ILLUMINATED CAUSING THE BRAKE TO ENGAGE INDEPENDENTLY. THE VEHICLE WAS NOT TAKEN TO THE DEALER FOR INSPECTION. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 20,000.
2011
VEHICLE SPEED CONTROL
PROBLEMS : LOST ACCELERATION WHEN THE CAR WAS FREE RUNNING (NO GAS PEDAL APPLIED) DOWN HILL OR DECLINED ROADS AT ABOUT 8-10 MPH, WHILE THE ENGINE SPEED WAS 1100RPM OR ABOVE ( THIS MOSTLY HAPPENED IN WINTER WHILE THE ENGINE WAS COLD OR NOT WARM UP, BUT IT HAPPENED IN HOT ENGINE TOO), IF I STEPPED ON THE GAS PEDAL TO ACCELERATE THE CAR AT THIS TIME, THE CAR WOULD NOT PICK-UP SPEED AND ACCELERATE; IT ACTED LIKE THE CAR WAS BEING DRIVEN IN NEUTRAL; THE GAS PEDAL FELT LIGHTER THAN NORMAL; EVEN IF THE ENGINE WAS RUNNING UP FROM 1000RPM TO 1800RPM, I STILL COULDN'T FEEL THE ACCELERATING; IT ACTED LIKE CONTINUING ITS FREE RUNNING. ONLY WHEN THE ENGINE RAN UP TO1800-2000RPM THEN THE CAR STARTED PICK-UP SOME ACCELERATION. IN OTHER WORDS, THREE CONDITIONS MUST HAPPEN AT THE SAME TIME TO SEE THIS PROBLEM: 1)FREE RUNNING (NO GAS PEDAL APPLIED) DOWN HILL OR DECLINED ROADS, 2)FREE RUNNING AT ABOUT 8-10 MPH, 3)ENGINE SPEED IS AT 1100RPM OR ABOVE THEN STEP ON GAS PEDAL TO ACCELERATE. THIS PROBLEM WOULD NOT HAPPEN ON UP-HILL ROAD, OR ACCELERATE SLOWLY FROM SPEED BELOW 10 MPH. I TOOK IT TO THE TOYOTA DEALER FOR INSPECTION TODAY. THE MECHANIC WAS ABLE TO REPRODUCE THIS PROBLEM ON A ROAD TEST WITH ME ON THE CAR. HE TESTED OTHER SIENNA LATER, WHILE I WAS WAITING. HE SAID ALL THE SIENNA ACTED LIKE THIS WAY. HE RESET THE COMPUTER FOR TRANSMISSION TO LEARN MY DRIVING HABIT, HOPING IT WILL FIX THE PROBLEM. I BELIEVE THIS IS A DESIGN IN COMPUTER PROGRAMMING PROBLEM. RESETTING COMPUTER WOULD NOT FIX THE PROBLEM. THAT UNABLE TO ACCELERATE MY CAR WHEN I NEED TO IS A DANGEROUS, FOR I MIGHT NOT BE ABLE TO AVOID SOME DANGEROUS SITUATIONS ON THE ROAD. *TR
