Intake Air Heater: Description and Operation

Manifold Intake Air Heater (MIAH)






NOTE: The Manifold Intake Air Heater is not used on the F-650/750.

To reduce white smoke during long idle periods at low ambient temperatures, the PCM will activate the intake air heater. Specific conditions must be present before the heater is activated:
^ ambient temperature must be below 0°C (32°F)
^ Engine Oil Temperature (EOT) must be below 55°C (131°F)
^ Vehicle Power (IVPWR) must be between 11.8 and 15.0 volts
^ parking brake must be applied on manual transmission vehicles
^ the transmission must be in PARK or NEUTRAL on automatic transmission vehicles
^ glow plugs must be off