A/C pressure transducer consists of piezoelectric element and it detects aircon refrigerant pressure. Piezoeletric type is more advantageous to obtain linear data of pressure than existing switch type. Thus, optimum control of aircon compressor and fan is realized and improved fuel efficiency follows with it.
P0532 is set when the A/C pressure below 0.13 bar - minimum pressure of A/C pressure transducer signal - is detected for more than 1.0 sec.. This code is due to open in power circuit or short to ground in signal circuit of A/C pressure transducer.
Item
Detecting Condition
Possible Cause
DTC Strategy
Voltage monitoring
A/C pressure transducer circuit
A/C pressure transducer component
Enable Conditions
IG KEY "ON"
Threshold Value
When output voltage is below the minimum value (below 0.13 bar)
Diagnostic Time
1.0 second
Fail Safe
Fuel cut
NO
EGR Off
Fuel Limit
MIL
Fig.1) Waveform of A/C pressure transducer in accordance with aircon operation.(aircon compressor operation)
Output signal(voltage) changes in accordance with the amount of refrigerant and the change of weather. Check if normal pressure change occurs in accordance with aircon compressor operation at normal pressure range shown in "Specification".