Note. For circuit reference, see DTC P1533 schematic.
Circuit Description
This test detects an over-temperature or over-pressure condition in the A/C system. DTC will set if high pressure switch disables the A/C clutch and the high side temperature is above a threshold. Under extremely hot ambient conditions, a rapid cycling situation could occur as this DTC is set and cleared. To protect the A/C system, if this DTC continues to set and clear, a lower high side temperature will be used to clear the DTC. If after this occurs and a rapid cycling condition is detected for the third time, lower temperature is used to clear the DTC and re-enable the A/C clutch.