Operation

OPERATION

The electric air pump only functions during cold starts. The PCM will not command the electric air pump to run if the engine coolant temperature is more than 10° Celsius (50° Fahrenheit) than ambient temperature, and when the coolant temperature is greater than 37° Celsius (98.6° Fahrenheit). The amount of time the pump will run is based on the amount of air flowing into the system. The amount of air flowing into the system is measured by a mass air flow sensor located at the air inlet tube. The maximum time the electric air pump will run is for 18 seconds.