DTC B1423/23 Pressure Sensor Circuit: Description

This DTC is output when refrigerant pressure is extremely low (0.19 MPa (2.0 kgf/cm² , 28 psi) or less) or extremely high (3.14 MPa (32.0 kgf/cm² , 455 psi) or more). The pressure sensor, which is installed on the pipe of the high pressure side to detect refrigerant pressure, outputs the refrigerant pressure signal to the front light ECU (front controller). The front light ECU (front controller) sends the read signal to the air conditioning amplifier via the CAN communication line. The air conditioning amplifier converts the signals to pressure according to the sensor characteristics to control the compressor.

HINT:

• Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be output if there is no refrigerant in the cycle.
• This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.