Tacoma 2WD V6-4.0L (1GR-FE) (2006)
Refrigerant Pressure Sensor / Switch: Testing and Inspection
PRESSURE SWITCH
ON-VEHICLE INSPECTION
1. INSPECT PRESSURE NO.1 SWITCH
HINT:
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The pressure switch is installed onto the air conditioning pipe on the high pressure side.
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The switch detects a drop in refrigerant pressure, such as from refrigerant leakage, and turns the magnet clutch off (*1) to prevent damage to
the compressor.
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The switch detects abnormally high pressure in the air conditioning cycle and turns the magnet clutch off (*1) to prevent damage to parts in the
air conditioning cycle. (*1): The ECM turns the magnet clutch on or off upon receiving the signal from the pressure switch.
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As the pressure switch operates when there is a malfunction with the refrigerant pressure, its function cannot be inspected on-vehicle. Follow
the procedures below to inspect it.
a. Inspect refrigerant pressure in the air conditioning cycle.
b. Read the manifold gauge pressure when the conditions below are established. (*2)
Test conditions:
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Engine is running at 1,500 rpm
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Blower speed control knob is in HI position
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Temperature control knob is in COOL position
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Air conditioning switch is ON
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Recirculation
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Doors fully open
Standard:
Pressure on high pressure side: 1.37 to 1.57 MPa (13.9 to 16.0 kgf.sq.cm, 198 to 228 psi)
HINT:
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If the refrigerant pressure is not within the standard range, inspect and repair the air conditioning cycle.
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Proceed to step (*2) if the refrigerant pressure is within the specified range.
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If the refrigerant pressure is below 196 kPa (2.0 kgf.sq.cm, 28 psi), the refrigerant amount in the air conditioning cycle may have
decreased significantly for reasons such as a gas leakage.