Geely EC718 2009 Workshop Manual page 102

2-20 Control System JL4G18-D
4. Variable Valve Timing Solenoid Valve (VVT)
VVT solenoid valve is located at the engine intake manifold side
near the front. VVT magnetic valve is a 4-bit 4-pass solenoid
valve, the working power supplied from main relay controlled
by ECM. ECM controls VVT solenoid valve ground with a pulse
width modulation signal. ECM controls VVT solenoid valve
through ECM harness connector EN01 terminal No.2.
5. Canister Solenoid Valve (EVAP)
Canister control valve is located in the engine cylinder head
cover side (transmission side) and is used to control the
Canister clean air flow. ECM controls Canister valve according
to engine load, engine temperature, speed and a series of
signals. Through an integrated calculation, ECM gives
electrical pulse duration and frequency (i.e. duty cycle) to
control EVAP. Accumulated fuel vapor in the Canister, can
cause environmental pollution once leaking. Canister solenoid
valve is opened at the right time, so that the excessive fuel
vapor after mixing with air entering into the intake manifold to
EC718/EC718RV EC715/EC715RV 10/2009
participate in combustion. Canister control valve consists of the
electromagnetic coils, armature and valves. Canister inlet port
has a filter. On one hand, air flow through the Canister control
valve is related to ECM to the Canister control valve output
electrical pulse duty cycle, on the other hand, it is related to the
pressure difference between the Canister inlet port and outlet
port. When there is no electrical pulse, the Canister control
valve is closed. According to the engine sensors provided
signals, ECM controls the Canister solenoid valve power-on
time, indirectly controls the air flow amount. When the engine
coolant temperature, engine working hours, engine load, etc.
meet the preset requirements, ECM will command Canister
solenoid valve work. Under the following conditions, Canister
will not work:
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– Engine cold start.
– Engine coolant temperature is relatively low.
– Engine idling.
– Engine heavy load.
–
Important system sensor malfunction.
ECM controls Canister solenoid valve through ECM harness
connector EN01 terminal No.37. When the EVAP solenoid
valve and circuit are faulty, DTC code P0444, P0458 , P0459
will be recorded.
6. Main Relay
86
L
87 30
85
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2 J 1
5
EF28 EF27 EF08
3
1
K
2 1
I
5 3
5
2 EF01
3
G
Engine
1
G 5 3
2
2
30
3 5 D
86 85
F 1
2
87
3 5 C
1
86 86
B 30
E 87
87 30
85
85
1413 12 11 10
86
87 A 30
9 8 6 5
7
85
4 3 2 1
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