FixVault
Home › Toyota › 2002 › 4Runner Base › Repair and Diagnosis › External Pages › Different car › Section 375 (Air Conditioning System) › Air Conditioning System › Inspection

Air Conditioning System: Inspection

WARNING: This page is about a different car, the 2002 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. COOLER COMPRESSOR ASSEMBLY 
    1. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to the body ground.
      Fig 1: Identifying Compressor Clutch Connector Terminals
      G01060361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the magnetic clutch energized.

      If operation is not as specified, replace the magnet clutch assy.

    3. Measure resistance between terminals No. 1 and 2 .
      1. Standard resistance: 165 - 205 Ω at 20 °C (68 °F) 

      If resistance is not as specified, replace the cooler compressor assy.

  2. MAGNET-CLUTCH RELAY 
    Fig 2: Identifying Magnet-Clutch Relay Terminals
    G01060363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Continuity Specification Table
    G01060362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If continuity is not as specified, replace the magnet-clutch relay.

  3. AIR MIX DAMPER SERVO SUB-ASSEMBLY 
    1. Inspect servomotor operation.
      1. Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 5, then check that the arm turns to "COLD" side smoothly.
        Fig 4: Identifying Air Mix Damper Servo Sub-Assembly Terminals
        G01060364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 5: Air Mix Damper Servo Sub-Assembly Operation Positions
        G01060366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 4, then check that the arm turns to "HOT" side smoothly.

      If operations are not as specified, replace the air mix servomotor.

    2. Inspect position sensor resistance.

      Measure resistance between terminals at servomotor arm each position as shown in the chart in Fig 6.

      If resistance is not as specified, replace the servomotor.

      Fig 6: Resistance Specification Table
      G01060365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 7: Resistance/Arm Position Graph
      G01060367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. MODE DAMPER SERVO SUB-ASSEMBLY 
    1. Inspect servomotor operation.
    2. Connect the positive (+) lead from the battery to terminal 7 and the negative (-) lead to terminal 8.
      Fig 8: Identifying Mode Damper Servo Sub-Assembly Positions & Terminals
      G01060369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the negative (-) lead from the battery to each terminal, as shown in the chart in Fig 9 and check that the shaft rotates at each position, as shown in Fig 8 .
      Fig 9: Mode Damper Servo Sub-Assembly Position Specification Table
      G01060368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If operation is not as specified, replace the servomotor.

  5. RECIRCULATION DAMPER SERVO SUB-ASSEMBLY 
    1. Inspect servomotor operation.
      1. Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 1, then check that the arm turns to "REC" side smoothly.
        Fig 10: Identifying Recirculation Damper Servo Sub-Assembly Positions & Terminals
        G01060370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Connect the positive (+) lead from the battery to terminal 5 and negative (-) lead to terminal 2, then check that the arm turns to "FRS" side smoothly.

      If operations are not as specified, replace the mode damper servomotor.

  6. COOLER THERMISTOR NO. 1 
    1. Check resistance between terminals 1 and 2 of Cooler thermistor No. 1 at each temperature, as shown in Fig 12 .
      Fig 11: Identifying Cooler Thermistor No. 1 Terminals
      G01060371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Resistance: 

      Fig 12: Resistance/Temperature Specification Graph
      G01060372Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If resistance value is not as specified, replace the sensor.

  7. BLOWER W/FAN MOTOR SUB-ASSEMBLY 
    1. Connect the positive (+) lead from the battery to terminal 2 and negative (-) to terminal 1, then check that the motor operation smoothly.
      Fig 13: Identifying Blower W/Fan Motor Sub-Assembly Terminals
      G01060373Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If operation is not as specified, replace the blower motor.

  8. BLOWER RESISTOR 
    1. Measure resistance between terminals, as shown in Fig 14 .
      Fig 14: Identifying Blower Resistor Terminals
      G01060375Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 15: Blower Resistor Resistance Specification Table
      G01060374Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If resistance is not as specified, replace the blower resistor.

  9. HEATER BLOWER MOTOR RELAY ASSEMBLY 
    Fig 16: Heater Blower Motor Relay Assembly Continuity Specification Table
    G01060376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 17: Identifying Heater Blower Motor Relay Assembly Terminals
    G01060377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If continuity is not as specified, replace the heater blower motor relay.

About FixVault