| 摘要 |
A physical-quantity detection sensor includes a sensor portion (10) for generating and outputting a voltage depending on a physical quantity. A signal processing circuit (4) operates for processing the voltage outputted from the sensor portion (10) to generate and output a voltage depending on the voltage outputted from the sensor portion (10) during a physical-quantity sensing mode of operation. A reference voltage is inputted into the signal processing circuit (4) during a checking mode of operation which differs from the physical-quantity sensing mode of operation. The reference voltage is different from the voltage outputted from the sensor portion (10). During the checking mode of operation, a malfunction of the signal processing circuit (4) is detected on the basis of an output signal from the signal processing circuit (4) which responds to the reference voltage inputted thereinto.
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