| 摘要 |
PROBLEM TO BE SOLVED: To perform prevention of theft even when a trouble, such as short circuit, occurs to a source line to a device to prevent the occurrence of theft through collation with an authentication code. SOLUTION: When an engine control device having a theft prevention function decides that the number N of revolutions of an engine is reduced to 0r.p.m. at a step 505, it is decided at a step 535. When it is decided that a given time elapses, an authentication code from the key of a vehicle is re-collated with an authentication code prestored on the vehicle side whether a given time elapses. When it is decided that the two authentication codes do not coincide with each other at a step 545, a theft decision flag is set to 1 at a step 545. When the theft decision flag is set to 1, the engine control device stops the starting of an engine. Thus, even when a trouble, such as short circuit, occurs to a source line to the engine control device, theft prevention is carried out. |
