Dtc 23 Pressure Switch Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK REFRIGERANT PRESSURE

CHECK AIR CONDITIONING OPERATION

CHECK HARNESS AND CONNECTOR (PRESSURE SWITCH - AIR CONDITIONING AMPLIFIER AND BODY GROUND)

DTC 23 Pressure Switch Circuit


DESCRIPTION


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 23 Pressure Switch Circuit

The pressure switch turns off when the A/C refrigerant pressure drops too low or rises too high. When the air conditioning amplifier detects the off state of the pressure switch, the amplifier outputs signals to the magnet clutch relay to turn the magnet clutch OFF.

DTC Code
Detection Item
Trouble Area
23
When either condition below is met:
  1. Open in pressure switch circuit
  2. Abnormal refrigerant pressure:
Below 196 kPa (2.0 kgf/cm2, 28 psi)
Over 3140 kPa (32.0 kgf/cm2, 455 psi)
  1. Pressure switch
  2. Harness or connector
  3. Refrigerant pipe line
  4. Air conditioning amplifier assembly

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 23 Pressure Switch Circuit


INSPECTION PROCEDURE

1.CHECK REFRIGERANT PRESSURE

  1. Install a manifold gauge.

  1. Read the manifold gauge pressure when these conditions are met.
    Test conditions:

    1. RECIRCULATION switch ON and temperature at air inlet is 30 to 35°C (86 to 95°F)
    2. Engine running at 1500 rpm
    3. Blower speed control switch in HI position
    4. Temperature control switch in COOL position
    5. Air conditioning switch ON
    6. Doors fully opened
    Standard pressure:
    Pressure on high-pressure side
    1.37 to 1.57 MPa (13.9 to 16.0 kgf/cm2, 198 to 228 psi)
    HINT:
    If the refrigerant pressure is below 196 kPa (2.0 kgf/cm2, 28 psi), the refrigerant amount in the air conditioning cycle may have decreased significantly due to gas leakage or other problems.


NG
CHECK REFRIGERANT (Toyota Fortuner RM000000VTE00GX.html)
OK


2.CHECK AIR CONDITIONING OPERATION


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 23 Pressure Switch Circuit

  1. Disconnect the P2 switch connector.

  1. Using a service wire, connect terminals 1 and 2 of the connector on the vehicle wire harness side.

  1. Start the engine.

  1. Turn the air conditioning switch ON and check the magnet clutch.

    OK:
    With terminals 1 and 2 connected, magnet clutch is ON.
    With terminals 1 and 2 disconnected, magnet clutch is OFF.


NG
Go to step 3
OK

REPLACE PRESSURE SWITCH

3.CHECK HARNESS AND CONNECTOR (PRESSURE SWITCH - AIR CONDITIONING AMPLIFIER AND BODY GROUND)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc 23 Pressure Switch Circuit

  1. Disconnect the P2 switch connector.

  1. Disconnect the A15 amplifier connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A15-5 (PSW) - P2-2
    		Always
    		Below 1 Ω
    P2-1 - Body ground
    A15-5 (PSW) - Body ground
    		Always
    		10 kΩ or higher
    P2-2 - Body ground
    Result
    Result
    		Proceed to
    OK (Checking from the PROBLEM SYMPTOMS TABLE)
    		A
    OK (Checking from the DTC)
    		B
    NG
    		C


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Toyota Fortuner RM0000012KH002X.html)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Toyota Fortuner RM000003S6F002X.html)