Refrigerant Pressure Sensor / Switch: Testing and Inspection
Refrigerant Pressure Switch No.1 Inspection1. Turn the ignition switch OFF.
2. Connect the manifold gauge set and measure the high-pressure side refrigerant pressure.
High-pressure side: Above 450 kPa (4.6 kgf/cm2, 65 psi)
3. If not as specified, check the refrigerant system.
4. If correct, go to next step.
5. Disconnect the refrigerant pressure switch No.1 connector.
6. Check for continuity of the switch.
7. If not as specified, replace the switch together with cooler pipe No.2.
Note:
^ If problems occur in the refrigeration system, causing abnormally high (above 2,460 - 2,840 kPa (25.0 - 29.0 kgf/cm2, 356 - 412 psi) or low (below 180 - 210 kPa (1.8 - 2.2 kgf/cm2, 26 - 31 psi) pressures, refrigerant pressure switch No.1 cuts power to the magnetic clutch to protect the mechanical components. If the pressure recovers to within normal operating range [below 1,670 - 2,450 kPa (17.0 - 25.0 kgf/cm2 , 242 - 355 psi) or above 360 - 450 kPa (3.6 - 4.6 kgf/cm2, 52 - 65 psi)], the power is again restored.
Refrigerant Pressure Switch No.2 Inspection (BP ENGINE WITH ATX ONLY)
1. Turn the ignition switch OFF.
2. Connect the manifold gauge set and measure the high-pressure side refrigerant pressure.
High-pressure side: below 1,180 kPa (12.0 kgf/cm2, 171 psi)
3. Disconnect the refrigerant pressure switch No.2 connector.
4. Check continuity of the switch.
5. If not as specified, replace the switch together with cooler pipe No.2.
6. If correct, go to next step.
Caution: While testing refrigerant pressure switch No.2, carefully note the high-pressure side refrigerant pressure. If the pressure increases above 1,770 kPa (18.0 kgf/cm2, 256 psi), stop the testing.
7. Disconnect the condenser fan connector.
8. Run the engine at 2,000 rpm, and operate the air conditioner at maximum cooling position.
9. Check that the refrigerant pressure switch turns on when the high-pressure side refrigerant pressure increases above 1,470 - 1660 kPa (15.0 - 17.0 kgf/cm2, 214 - 241 psi).
10. If not as specified, replace the switch together with cooler pipe No.2.