Dtc B1423/23 Pressure Sensor Circuit

Heater & Air Conditioning System. Camry. Acv40 Gsv40
Air Conditioning. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK REFRIGERANT PRESSURE

CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - A/C AMPLIFIER)

INSPECT PRESSURE SENSOR

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 a refrigerant pressure signal to the A/C amplifier. The A/C amplifier converts this signal 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 system.

DTC No.
DTC Detection Condition
Trouble Area
B1423/23
Open or short in pressure sensor circuit
  1. Pressure sensor
  2. Harness or connector between pressure sensor and A/C amplifier
  3. Refrigerant pipe line
  4. A/C amplifier

WIRING DIAGRAM


Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1423/23 Pressure Sensor Circuit


INSPECTION PROCEDURE

1.CHECK REFRIGERANT PRESSURE

  1. Install the manifold gauge set (CAMRY_ACV40 RM000001147007X_01_0002.html).



    Camry. Acv40 Gsv40

  1. Read the manifold gauge pressure when the following conditions are established.

    1. Prepare the vehicle according to the chart below.

      Item
      		Condition
      Vehicle Doors
      		Fully open
      Temperature Setting
      		MAX COLD
      Blower Speed
      		HI
      A/C Switch
      		ON
      R/F Switch
      		RECIRCULATION
      (30 to 35°C (86 to 95°F))
      Standard pressure:
      Low pressure side:
      0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2, 21.3 to 35.6 psi)
      High pressure side:
      1.37 to 1.57 MPa (14 to 16 kgf/cm2, 199 to 228 psi)


NG
CHARGE REFRIGERANT
OK


2.CHECK HARNESS AND CONNECTOR (PRESSURE SENSOR - A/C AMPLIFIER)


    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1423/23 Pressure Sensor Circuit

  1. Disconnect the pressure sensor connector.



    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1423/23 Pressure Sensor Circuit

  1. Disconnect the A/C amplifier connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A27-2 (PR) - E38-9 (PRE)
    		Always
    		Below 1 Ω
    A27-3 (+) - E38-10 (S5-3)
    		Always
    		Below 1 Ω
    A27-1 (-) - E38-13 (SG-2)
    		Always
    		Below 1 Ω
    E38-9 (PRE) - Body ground
    		Always
    		10 kΩ or higher
    E38-10 (S5-3) - Body ground
    		Always
    		10 kΩ or higher
    E38-13 (SG-2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT PRESSURE SENSOR

  1. Install the manifold gauge set (CAMRY_ACV40 RM000001147007X_01_0002.html).



    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1423/23 Pressure Sensor Circuit

  1. Connect the three 1.5 V dry cell batterie's positive (+) lead to terminal 3, and the negative (-) lead to terminal 1. Then connect the voltmeter's positive (+) lead to terminal 2, and the negative (-) lead to terminal 1. Measure the voltage.

    OK:
    The voltage changes according to refrigerant pressure, as shown in the graph.
Result:
Result
Proceed to
NG
A
OK (When troubleshooting according to the DTC)
B
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
C


B
REPLACE AIR CONDITIONING AMPLIFIER

C
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A

REPLACE PRESSURE SENSOR