CX210/CX240 ELECTRONIC FUEL SYSTEM
8 - 12
CX EXCAVATORS
AIR HEATER
An air heater at the inlet of the intake manifold, assists in cold starting of the engine and the
reduction of white smoke during warm-up. The air heater is a solenoid operated integrated
grid device, installed at the entrance to the intake manifold and is controlled by the ECM.
The ECM determines when to actuate the air heater based on intake air temperature and fuel
temperature. If the intake air temperature sensor fails, the fuel temperature sensor will be
used. An Engine Pre Heat indicator in the machine monitor indicates the air heater is
energized and preheating.
The air heater uses two separate grids to heat the air. After start up the grids are cycled on
and off to reduce white smoke during warm up. The heat cycle is determined by the ECM
based on intake air temperature and fuel temperature. If the fuel temperature is lower than
intake air temperature, fuel temperature will take priority in controlling the cycle.
If the engine does not start, the pre-heat cycle can be restarted by turning the key off and
back on. The air heater functions are terminated when the engines load exceeds 10% for
more than 10 seconds or when intake air exceeds 66 degrees F. The two grids of the air
heater receive current from the battery through two separate Bosch relays. The relays are
controlled by the ECM.
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