Sentra Wagon FWD L4-1597cc 1.6L SOHC (GA16i) (1989)
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Positive Temperature Coefficient (PTC) Heater: Description and Operation
Fig. 193 Mixture Heater
The Fuel Mixture Heater (EFE) is located between the throttle chamber and the intake manifold.
It is energized through the mixture heater relay via a signal sent by the ECU.
Its purpose is to help atomize fuel during cold engine starting by heating the air/fuel mixture.
Only under the following conditions does the ECU energize the mixture relay which in turn energizes the heater:
^Coolant temperature below 50° C (122° F).
^While starting the engine.
The EFE turns off after several minutes have passed when coolant temperature exceeds 50° C (122° F).
