| Issue ID | 604219 |
| Internal NHTSA # | 10169631 |
| Manufacurer | TOYOTA MOTOR CORPORATION |
| Brand | TOYOTA |
| Model | SIENNA |
| Model Year | 2005 |
| File date | 17/08/06 |
| Component | TIRES:PRESSURE MONITORING AND REGULATING SYST |
| Product type code | VEHICLE |
| Description of the problem | Major safety problem with tire air pressure system. Normal tire pressure is 35 psi. Because of the tire design, you can run with very low air pressure and not feel it (on a normal car, it is very obvious). That is why toyota had to put in the tire pressure warning system/light. Twice the tire pressure warning system did not come on until a tire had ~10 psi. That is a dangerous level. The first time i did nothing and the tire was replaced by the tire manufacturer (nail issue) and the tire was less then 7 months old. The second time, i brought it to the dealer. They tested two ways: 1) on the computer and it passed; 2) test drive where alert light came on below 18 psi. In my testing it came on between 10-15 psi and in real life closer to 10-11 psi (based on my 2 problems). Checking tire pressure daily does not help because in real life, if you take a trip you can drive for 3-6 hours which if something happens to the tire during the trip, you will not know until it fails (again this is because unlike normal tires, you can not tell the tire has lost significant air pressure. You can read here and other places about the catastrophic failures others have had in just this situation. I spent many many hours on the phone with toyota to get the specification on when the system should alert you. I was once told it is a difference of more then 5 psi. However, it seems that toyota has no published spec for how the system should work in real life. This is defective and toyota is not telling us the truth. All systems have to be designed to a spec. This system was and there is somewhere at toyota a spec. They are not sharing with consumers because of the implication it would have (they will have to recall/fix them). I do hope someone at the nhtsa will pursue this since it is a safety issue for families. *nm |
| Vehicle Mileage at Failure | 9700 |
| Number of Occurences | 2 |
| Source of the issue | NHTSA WEB SITE |
| City and State | BROOKLYN, NY |
| VIN pattern | 5TDBA22C05SXXXXXX |
| Was vehicle invloved in a crash? | N |
| Was vehicle involved in a fire? | N |
| Was incedent reported to police? | N |
| Was medical attention required? | |
| Was part original equipment? | |
| No. of injured persons | 0 |
| No. of fatalities | 0 |
| Date of purchase | 11/04/05 |
| Was original owner? | Y |
| Anti-lock brakes | N |
| Cruise control | Y |
| Number of cylinders | 6 |
| Drive train type | AWD |
| Transmission type | AUTO |
| Vehicle speed | 55 |
| DoT tire identifier | |
| Tire size | |
| Location of tire code | |
| Type of tire failure code | |
| Was defective tire repaired? | |
| Date of manufacture | |
| Type of child seat code | |
| Type of restraint | |
| Dealer's name | BAY RIDGE TOYOTA |
| Dealer's telephone number | 718-439-3737 |
| Dealer's city | BROOKLYN |
| Dealer's state code | NY |
| Dealer's ZIP code | 11220 |