Geely EC718 2009 Workshop Manual page 97

Engine
2. Camshaft Position Sensor (CMP)
Engine control module receives this signal as a sync pulse,
according to an appropriate sequence to trigger the fuel
injectors. Engine control module uses the camshaft position
sensor signals to instruct cylinder No.1 piston position during
power stroke. Engine control module then calculates the actual
fuel injection sequence. If when the engine is running, the
camshaft position sensor signal is lost, the fuel injection system
will be converted to a fuel injection pulse based on the previous
calculation of the fuel injection model, while the engine will
continue to run. Even if the fault exists, the engine can be
restarted. Sensor signals pass through ECM harness
connector EN01 terminal No.42 to ECM. When the engine is
running if the control module detects an incorrect camshaft
position sensor signal, it will record DTC code P0340, P0341,
P0342, P0343. DTC code P0016 will be recorded when the
crankshaft relative position is incorrect.
3. Intake Air Pressure and Temperature Sensor
Intake air pressure and temperature sensor has an intake
pressure sensing element and a thermistor. When the engine
is working, the engine intake pressure sensing element
produces the intake air pressure signal, negative temperature
coefficient thermistor produces intake air temperature signal.
This sensor detects intake manifold pressure change caused
by engine load and speed changes. These changes will be
converted to the voltage output. When the engine decelerates,
the throttle body closes resulting in a relatively low intake
manifold absolute pressure output. Intake manifold absolute
pressure and vacuum degree is opposite. When the manifold
pressure is high, the vacuum is low. MAP sensor is also used
to measure atmospheric pressure. This measurement is
calculated as part of the MAP calculation. When the ignition
switch is turned on and the engine is not running, the engine
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control module reads atmospheric pressure as the intake
manifold pressure, and adjusts the Air-Fuel ratio accordingly.
With this kind of altitude compensation, the system can
maintain a low emissions while maintaining maneuverability.
Sensor signal passes through ECM harness connector EN01
terminal No.19 to ECM. When MAP sensor and its circuit
malfunction occurs, DTC P0105, P0106, P0107, P0108 will be
recorded. DTC code P0105, P0106, P0107, P0108 will be
recorded when MAP sensor and its circuit have malfunctions.
Engine control module provides 5V voltage to the thermistor
and measure the voltages change to determine the intake air
temperature. The engine control module obtains the intake air
temperature by measuring the voltage. ECM uses this signal
to adjust the injector pulse width and ignition timing. Sensor
signals pass through ECM harness connector EN01 terminal
No.25 to ECM. DTC code P0112, P0113 will be recorded when
there is a circuit malfunction.
4. Knock Sensor (KS)
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Control System JL4G18-D
EC718/EC718RV EC715/EC715RV 10/2009
2-15
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