Vehicular anomaly diagnosis system

Details Vehicular anomaly diagnosis system Vehicular anomaly diagnosis system

2008-07-08

2008-07-08

Sherry, Michael J (Department: 2836)

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

C361S162000, C361S170000, C361S187000, C701S029000, C701S034000

Reexamination Certificate

active

07397148

ABSTRACT:
An engine start is beforehand detected when a preparation operation to engine start is detected. When the preparation operation is detected based on a seat switch indicating that a driver seats himself on a driver seat, control of an electric current for a heater of an air/fuel ratio sensor is started. The air/fuel ratio sensor is then activated prior to the engine start. Failure diagnosis is conducted on a function for detecting the preparation operation. Namely, the seat switch is diagnosed as having failure, for instance, by the following. Even while a vehicle travels, the seat switch is in an OFF state indicating that no driver is seated. This structure can restrict the engine start without the air/fuel ratio sensor being pre-heated. It can also restrict deteriorating of emission.

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