1, the circuit failure, the circuit failure generally has the following conditions: the bridge lead (power supply power line) is broken, the output signal line is broken and the bridge is broken.
2, the power supply failure, the power supply that provides voltage to the sensor is not working normally, when the power supply can not provide its standard voltage, equivalent to the above mentioned power supply line break, and when the power supply voltage is low, the sensor feedback information sensitivity decreases; On the contrary, when the supply voltage is too high, the current passing through the strain gauge will exceed its rated current and cause damage to the strain gauge (in the maintenance of the transmission, it has encountered repeated damage to the pressure sensor caused by the ECU supply voltage is too high).