Geely EC718 2009 Workshop Manual page 670

2-588 Control System JL4G15-D
Engine control module is a core microprocessor with a a micro
chip controller. Its function is to process data from various
vehicle sensors to determine the engine's working condition,
and through the various actuators controls engine actuators.
ECM normal working voltage is 9.0 V-16 V
Note
Although ECM has the voltage over load and reverse
polarity voltage protection function, during the repair
process it is prohibited to connect the battery positive
and negative wrong or apply voltage higher than 15V.
Otherwise, it will cause damage to ECM and other
electrical equipments.
2. Crankshaft Position Sensor (CKP)
The crankshaft position sensor output can be used to
determine crankshaft position and rotation speed. Crankshaft
position sensor is a magnetic-electric sensor, which is installed
in the front end of the transmission housing, and tightened with
bolts, below the coolant temperature sensor. Flywheel signal
plate and the crankshaft sensor is an integrated part. The
sensor and the signal plate tooth gap in between 0.3 and 1.5
mm (0.01-0.06 in). The signal plate has 58 machined slots.
When the crankshaft rotates, 58X tooth tip and the alveolar
passes through the sensor from different distances. The sensor
senses the reluctance change, the alternating reluctance
generates an alternating output signal. The 58X gear plate gap
position aligns with engine top dead center. When the cylinder
No.1 reaches top dead center, The sensor aligns with the 20th
tooth lower edge. ECM uses this signal to determine crankshaft
position and rotation speed.
Sensor Resistance: 500 Ω-610 Ω
Output Voltage: 400 mV when 60 rpm. The voltage increases
as the speed increases.
EC718/EC718RV EC715/EC715RV 10/2009
3. Intake Manifold Pressure / Temperature Sensor
(MAP / IAT)
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
control module reads atmospheric pressure as the intake
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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.
Engine
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