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10A-3
FFH SYSTEM
FUEL FIRED HEATER (FFH) SYSTEM
In fuel fired heater system equipped vehicle (D27DT engine equipped), when the ambient temperature and coolant
temperature is low, the burner installed in engine cooling system increases the temperature of coolant that flows into
heater by firing diesel fuel for a certain period of time.
The D27DT engine equipped vehicle has the Positive Temperature Coefficient (PTC) system as a basic equipment. FFH
is operated by the coolant temperature and ambient temperature while PTC is operated by the coolant temperature
intake air temperature.
FFH system consists of independent fuel lines and fuel pump, coolant circuit and coolant circulation pump, electrical
glow plug and exhaust system. It also provides the diagnostic function.
FFH system cannot be operated or stopped by driver's intention. The FFH system is automatically operated by the
coolant temperature and the ambient temperature.
The FFH system operates up to more 2 minutes to burn the residual fuel inside the system when stopping the engine
during its operation. Therefore, a certain period of FFH operation after stopping the engine is not a malfunction.
COMPONENTS LOCATOR
FFH assembly
Diagnostic connector
Coolant circulation
pump
Ambient temperature
Fuel pump
switch
Y220_10A001
FFH/PTC SYSTEM
CHANGED BY
REXTON SM - 2004.4
EFFECTIVE DATE
AFFECTED VIN
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