Early Fuel Evaporation (EFE) Heater Operation

Early Fuel Evaporation (EFE) Heater Operation:

The Powertrain Control Module (PCM) will energize the EFE heater relay coil when the engine is below normal operating temperature and engine speed is above idle. Ignition positive voltage is supplied to the EFE heater through the electrical contacts in the EFE heater relay. The EFE heater will preheat the air/fuel mixture before it enters the combustion chambers. The PCM will de-energize the EFE system when the engine reaches normal operating temperature, or the engine speed is reduced to idle.