Air Conditioning System (For Automatic Air Conditioning System) On-Vehicle Inspection


  1. INSPECT PRESSURE SWITCH

Air Conditioning System (For Automatic Air Conditioning System) -- On-Vehicle Inspection



1. INSPECT PRESSURE SWITCH



Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) On-Vehicle Inspection

HINT:
  1. The pressure switch on the low-pressure side detects decreases in refrigerant pressure, such as decreases due to refrigerant leakage. If a decrease is detected, the switch sends a signal to the air conditioning amplifier, which then turns the magnet clutch OFF to prevent damage to the compressor.
  2. The pressure switch on the high-pressure side detects abnormally high pressure in the air conditioning cycle. If detected, the switch sends a signal to the air conditioning amplifier, which then turns the magnet clutch OFF to prevent damage to parts in the air conditioning cycle.
  3. The air conditioning amplifier turns the magnet clutch ON or OFF upon receiving the signal from the pressure switch.
  4. As the pressure switch operates only when refrigerant pressure malfunctions are present, a direct on-vehicle inspection of the switch's operation cannot be performed. Follow the procedures below.

  1. Step 1: Inspect refrigerant pressure in the air conditioning cycle.

    1. Install a manifold gauge.

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

      1. RECIRCULATION switch ON and temperature at the 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 open
      Standard pressure:
      Pressure on high-pressure side
      1.37 to 1.57 MPa (13.9 to 16.0 kgf/cm2, 198 to 228 psi)
      If the refrigerant pressure is within the specified range, proceed to step 2.
      If the refrigerant pressure is not within the specified range, inspect and repair the air conditioning cycle.
      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.


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Air Conditioning System (For Automatic Air Conditioning System) On-Vehicle Inspection

  1. Step 2: Check the air conditioning operation.

    1. Disconnect the P2 pressure switch connector.

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

    3. Start the engine.

    4. 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.
      If the magnet clutch is operating normally, replace the pressure switch.
      If the magnet clutch is malfunctioning, inspect and repair the wire harness between the pressure switch and air conditioning amplifier.