Dtc B1423/23 Pressure Sensor Circuit

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK REFRIGERANT

READ VALUE USING INTELLIGENT TESTER (REG PRESS SENS)

CHECK WIRE HARNESS (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER)

INSPECT AIR CONDITIONING AMPLIFIER

INSPECT AIR CONDITIONING PRESSURE SENSOR

DTC B1423/23 Pressure Sensor Circuit


DESCRIPTION

This DTC is output when the refrigerant pressure is either 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 air conditioning pressure sensor, which is installed on the pipe of the high pressure side, detects the refrigerant pressure and sends refrigerant pressure signal to the air conditioning amplifier. The air conditioning amplifier determines the pressure from the signals in accordance with the sensor characteristics, and controls the compressor accordingly.

DTC No.
DTC Detection Condition
Trouble Area
B1423/23
Open or short in pressure sensor circuit
  1. Air conditioning pressure sensor
  2. Harness and connector between air conditioning pressure sensor and air conditioning amplifier
  3. Air conditioning amplifier

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1423/23 Pressure Sensor Circuit


INSPECTION PROCEDURE

1.CHECK REFRIGERANT
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1423/23 Pressure Sensor Circuit

  1. Check the sight glass of the cooler unit refrigerant liquid pipe.

    1. Prepare the vehicle in accordance with the chart below.

      Item
      		Condition
      Engine Speed
      		1500 rpm
      Vehicle Doors
      		Fully open
      Temperature Setting
      		MAX COLD
      Blower Speed
      		HI
      A/C Switch
      		ON

    2. Compare the sight glass to the following chart.

      Item
      		Symptom
      		Amount of Refrigerant
      		Corrective Procedures
      1
      		Bubbles visible
      		Insufficient*
      		(1) Check for gas leakage and repair if necessary
      (2) Add refrigerant until bubbles disappear
      2
      		No bubbles visible
      		Empty, insufficient or too much
      		Refer to items 3 and 4
      3
      		No temperature difference between compressor inlet and outlet
      		Empty or nearly empty
      		(1) Check for gas leakage with gas leak detector and repair if necessary
      (2) Add refrigerant until bubbles disappear
      4
      		Considerable temperature difference between compressor inlet and outlet
      		Correct or too much
      		Refer to items 5 and 6
      5
      		Immediately after A/C turned OFF, refrigerant becomes clear
      		Too much
      		(1) Drain or discharge refrigerant
      (2) Bleed air and supply proper amount of purified refrigerant
      6
      		Immediately after A/C turned OFF, refrigerant foams and then becomes clear
      		Correct
      		-
      HINT:
      *: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.


NG
CHARGE REFRIGERANT
OK


2.READ VALUE USING INTELLIGENT TESTER (REG PRESS SENS)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

  1. Select the item below in the Data List, and read the value displayed on the intelligent tester.

    Air conditioning amplifier:

    Item
    		Measure Item / Display
    (Range)
    		Normal Condition
    		Diagnostic Note
    Reg Press Sens
    		Regulator pressure sensor /
    Min.: 0 MPaG
    Max.: 3.187 MPaG
    		Actual regulator pressure is displayed
    		-
    OK:
    The display is as specified in the normal condition column.

    Result:

    Result
    		Proceed to
    NG
    		A
    OK (Checking from the PROBLEM SYMPTOMS TABLE)
    		B
    OK (Checking from the DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


3.CHECK WIRE HARNESS (PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1423/23 Pressure Sensor Circuit

  1. Disconnect the A32 pressure sensor connector.

  1. Disconnect the E42 amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A32-3 (+) - E42-7 (S5-3)
    		Below 1 Ω
    A32-2 (PR) - E42-12 (PRE)
    		Below 1 Ω
    A32-1 (-) - E42-10 (SG-2)
    		Below 1 Ω
    A32-3 (+) - Body ground
    		1 MΩ or higher
    A32-2 (PR) - Body ground
    		1 MΩ or higher
    A32-1 (-) - Body ground
    		1 MΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


4.INSPECT AIR CONDITIONING AMPLIFIER
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1423/23 Pressure Sensor Circuit

  1. Remove the air conditioning amplifier with its connectors still connected.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    E42-10 (SG-2) - E42-24 (GND)
    		Below 1 Ω

  1. Turn the ignition switch on (IG).

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E42-7 (S5-3) - E42-10 (SG-2)
    		4.5 to 5.5 V


NG
REPLACE AIR CONDITIONING AMPLIFIER
OK


5.INSPECT AIR CONDITIONING PRESSURE SENSOR
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1423/23 Pressure Sensor Circuit

  1. Turn the A/C switch ON.

  1. Disconnect the A32 air conditioning pressure sensor connector.

  1. Connect the three 1.5 V dry cell batteries' 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 the refrigerant pressure as shown in the graph


NG
REPLACE AIR CONDITIONING PRESSURE SENSOR
OK

REPLACE AIR CONDITIONING AMPLIFIER