CX210/CX240 ELECTRONIC FUEL SYSTEM
8 - 4
CX EXCAVATORS
ELECTRONIC CONTROL SYSTEM
Outputs
• The electrically operated lift pump is located at the left rear of the engine and is controlled
by the Electronic Control Module (ECM). The pump will operate for 2 seconds when the
key is first turned on. It also runs throughout the cranking mode and will continue to run
for 25 seconds after cranking stops without the engine running. The pump runs
constantly when the engine is running. The pump draws fuel from the tank and supplies
pressurized fuel to the filter and pump. Lift pump pressure must not exceed 7 PSI in the
non-running mode and 10 PSI at maximum speed.
• The Fuel Pump Control Module (FPCM) receives fuel delivery requirement information
and electrical power from the Engine Electronic Control Module (ECM). The Fuel Pump
Control Module determines the delivery rate and injection timing by controlling the
metering valve in the Bosch VP44 fuel injection pump.
Communication of information between the Engine Electronic Control Module (ECM) and
the Fuel Pump Control Module (FPCM) is provided by a second data buss.
Output information from the Fuel Pump Control Valve to the Electronic Control Module
include fuel temperature in the pump housing and fuel pump timing.
• A Bosch relay, located near the front left engine mount supplies power to the fuel injection
pump. The relay receives electrical power from the ECM.
•
An intake manifold grid heater uses battery voltage to heat the incoming air for cold start
aid. The grid heater is controlled by two relays which are controlled by the ECM.
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