The Secondary Air Injection System Air Flow/Pressure Sensor circuit is responsible for decreasing hydrocarbon emissions, which come from the exhaust and are created during engine startup when the weather conditions are cold. The Powertrain Control Module is responsible for turning on the air pump, which delivers fresh, pressurized air for faster operation of the catalytic converter, which in turn reduces the level of exhaust gases. This pressure sensor monitors this value at the air control solenoid inlet to determine when to open and close the valve at certain pressures and temperatures.
If the PCM finds a voltage or resistance value in the Secondary Air Injection System Air Flow/Pressure Sensor circuit that is excessively below the set value, the P2432 OBDII fault code will be stored.