Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2006SEQUOIA 4WD V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGREFRIGERANT PRESSURE SENSOR / SWITCHTESTING AND INSPECTION
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)
Refrigerant Pressure Sensor / Switch: Testing and Inspection
2006 Toyota Sequoia 4WD V8-4.7L (2UZ-FE)SECTION Testing and Inspection
PRESSURE SWITCH
ON-VEHICLE INSPECTION
1. INSPECT PRESSURE SWITCH
a. Set manifold gauge set.
b. Disconnect connector
c. Run engine at approx. 2,000 rpm
d. Set blower speed control switch to "HI" position
e. Set temperature control lever to "MAX. COOL" Position
f. A/C switch on
g. Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1
h. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration If operation is not as specified, replace the pressure switch.
i. Stop engine and remove manifold gauge set
j. Connect connector to pressure switch
2. INSPECT PRESSURE SWITCH (for Cooling Fan Control)
a. Set manifold gauge set.
b. Disconnect connector
c. Run engine at approx. 2,000 rpm
d. Set blower speed control switch to "HI" position
e. Set temperature control lever to "MAX. COOL" position
f. A/C switch on
g. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3.
h. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration. If operation is not as specified, replace the pressure switch.
i. Stop engine and remove manifold gauge set
j. Connect connector to pressure switch
ON-VEHICLE INSPECTION
1. INSPECT PRESSURE SWITCH
a. Set manifold gauge set.
b. Disconnect connector
c. Run engine at approx. 2,000 rpm
d. Set blower speed control switch to "HI" position
e. Set temperature control lever to "MAX. COOL" Position
f. A/C switch on
g. Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1
h. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration If operation is not as specified, replace the pressure switch.
i. Stop engine and remove manifold gauge set
j. Connect connector to pressure switch
2. INSPECT PRESSURE SWITCH (for Cooling Fan Control)
a. Set manifold gauge set.
b. Disconnect connector
c. Run engine at approx. 2,000 rpm
d. Set blower speed control switch to "HI" position
e. Set temperature control lever to "MAX. COOL" position
f. A/C switch on
g. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3.
h. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration. If operation is not as specified, replace the pressure switch.
i. Stop engine and remove manifold gauge set
j. Connect connector to pressure switch
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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.