Intake Air Heater: Description and Operation

MANIFOLD INTAKE AIR HEATER (MIAH)






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