A/C pressure sensor is installed betweem receiver driver and expansion valve. Sensing refrigerants pressure, this sensor converts pressure into voltage to input the value to PCM. With this signal, PCM performs idle control, cooling fan control, aircon compresser control.
Checking output signals from A/C pressure sensor under detecting condition, if an signal above 4.65V lasts for more than 10 sec., PCM sets P0533.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● Detects sensor signal short to high voltage | ● Poor connection ● Short to battery in signal circuit ● Open in ground circuit ● Faulty A/C pressure sensor ● Faulty PCM |
Enable Conditions | ● Engine works | |
Threshold value | ● Sensor output voltage ＞ 4.65V | |
Diagnosis Time | ● Continuous (More than 10 seconds failure for every 20 seconds test) | |
MIL On Condition | ● DTC only (NO MIL ON) |
Pressure(psi) | 13.7 | 127.4 | 241.2 | 355.0 | 468.8 |
Voltage(V) | 0.5 | 1.5 | 2.5 | 3.5 | 4.5 |
