DTC B1423/23: Pressure Sensor Circuit: Description

This DTC is output if refrigerant pressure on the high pressure side is extremely low (0.176 MPa (2.0 kgf/cm² , 28 psi) or less) or extremely high (3.03 MPa (32.0 kgf/cm² , 440 psi) or more). The pressure sensor, which is installed on the pipe on the high pressure side to detect refrigerant pressure, outputs a refrigerant pressure signal to the air conditioning amplifier. The air conditioning amplifier converts this signal to a pressure value according to the sensor characteristics, to control the compressor.

DTC No.	DTC Detection Condition	Trouble Area
B1423/23	Open or short in pressure sensor circuit Refrigerant pressure on the high pressure side is extremely low (0.176 MPa (2.0 kgf/cm² , 28 psi) or less) or extremely high (3.03 MPa (32.0 kgf/cm² , 440 psi) or more).	Air conditioning pressure sensor Harness or connector between pressure sensor and air conditioning amplifier Air conditioning amplifier Expansion valve (blocked, stuck) Condenser (blocked, deterioration of cooling capacity due to dirt) Cooler dryer (moisture in the refrigerant cycle cannot be absorbed) Cooling fan system (condenser cannot be cooled down) Air conditioning system (leaks, blocked)