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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 357 (HVAC - GENERAL SERVICING)PRESSURE SWITCHON-VEHICLE INSPECTION
2004 Toyota Matrix XR, FWD, Standard

On-Vehicle Inspection

2004 Toyota Matrix XR, FWD, StandardSECTION On-Vehicle Inspection
WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Set on manifold gauge set  . See MANIFOLD GAUGE SET .
  2. Disconnect connector  . See Fig 1.
  3. Run engine at approx. 2,000 rpm  .
  4. Set blower speed control switch to "HI" position  .
  5. Set temperature control lever to "MAX. COOL" position  .
  6. A/C switch ON  .
    Fig 1: Locating Pressure Switch Connector & Identifying Terminals
    G01127899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Inspect pressure switch operation  , see Fig 2:
    1. Connect the positive (+) lead from the ohmmeter to terminal 4 and negative (-) lead to terminal 1. See Fig 1.
    2. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.

      If operation is not as specified, replace the pressure switch.

    Fig 2: Testing Pressure Switch Operation
    G01127900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Cooling fan control  :

    Inspect pressure switch operation. See step  7.

  9. Stop engine and set off manifold gauge set  .
  10. Connect connector to pressure switch  , see Fig 3:
    1. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3. See Fig 1.
    2. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.

      If operation is not as specified, replace the pressure switch.

  11. Stop engine and set off manifold gauge set  .
  12. Connect connector to pressure switch  .
    Fig 3: Testing Cooling Fan Control
    G01127901Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.