1. Pressure switch inspection
1. On-vehicle inspection
1) Inspect the magnetic clutch and condenser fan operation while operating the A/C and checking the refrigerant pressure for the following.
- Door glass: Fully closed
- Temperature adjustment: MAX COOL
- Blower fan speed: MAX
- Air source lever: RECIRC position
<Normal pressure (reference)>
Standard: 1,373 to 1,667 kPa { 14.0 to 17.0 kgf/cm2 } High pressure side
Standard: 127 to 245 kPa { 1.30 to 2.50 kgf/cm2 } Low pressure side
The pressure switch monitors for abnormal refrigerant pressure, and turns OFF the magnetic clutch during an abnormal condition to prevent compressor damage.
| Operation |
Refrigerant pressure |
Magnetic clutch |
| Low pressure side switch |
176 to 216 kPa { 1.8 to 2.2 kgf/cm2 / 26 to 31 psi } |
OFF |
| 195 to 255 kPa { 2.0 to 2.6 kgf/cm2 / 28 to 37 psi } |
ON |
|
| High pressure side switch |
2,840 to 3,040 kPa { 29.0 to 31.0 kgf/cm2 / 412 to 441 psi } |
OFF |
| 2,050 to 2,650 kPa { 20.9 to 27.0 kgf/cm2 / 297 to 384 psi } |
ON |
2. Continuity inspection
1) Disconnect the connector from the pressure switch.
2) Inspect for continuity between the pressure switch connector terminals using a DMM.
<Measurement conditions>
- The connector is disconnected.
- A/C gas: Filled with the specified amount
| Inspection location |
Terminal No. |
Continuity |
| Pressure switch |
1-2 |
Yes |
