On-Vehicle Inspection

INSPECT PRESSURE SENSOR
1. Pressure sensor
  1. Install the manifold gauge set (See ON-VEHICLE INSPECTION ).
  2. 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.
    
    If the voltage is not as specified, replace the pressure sensor.
    
    Fig 1: Measuring Pressure Sensor Voltage And Refrigerant Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT LOW PRESSURE SENSOR
1. Low pressure sensor
  1. Install the manifold gauge set (See ON-VEHICLE INSPECTION ).
  2. 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.
    
    If the voltage is not as specified, replace the low pressure sensor.
    
    Fig 2: Measuring Low Pressure Sensor Voltage And Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002