Note. For circuit reference, see DTC P1533 schematic.
Circuit Description
The A/C high side temperature sensor uses a thermistor to control the signal voltage to PCM. PCM applies 5 volts to A/C high temperature sensor circuit. When sensor is cold, sensor resistance is high and PCM will see a high signal voltage. As the sensor warms up, its resistance drops and signal voltage is pulled low through the ground circuit. This test detects a shorted to ground or open A/C high side temperature sensor circuit by setting DTC if the PCM monitors a signal voltage (temperature) that is too high or low.