DTC B1423: Pressure Sensor Circuit: Description

WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is output when refrigerant pressure on the high pressure side 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 A/C pressure sensor, installed on the high pressure line to detect refrigerant pressure, outputs a refrigerant pressure signal to the A/C amplifier. The A/C 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	Open or short in A/C pressure sensor circuit Refrigerant pressure on the high pressure line 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).	A/C Pressure sensor Harness or connector between A/C pressure sensor and A/C amplifier A/C 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) A/C system (leaks, blocked)