Chery A21 2005, Service Manual, Page: 348 / 475

CHERY
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A21 SERVICE MANUAL ENGINE EFI SYSTEM
25
3.11 CARBON CANISTER SOLENOID VALVE
1)Exterior drawing and pin definition
Canister control valve only has two pins; one is
connect to No.87 pin of main relay output end; and
another pin connected to No. 5 pin of ECU.
2)Installation position : Canister vacuum pipe of
intake manifold
3)Purpose: Control the quantity of the cleaning
flow from canister to air intake chief pipe. The
absorption of the canister is limited so if the
gasoline vapor adhesive to canister can not be
consumed the gasoline vapor will volatility to
outside and pollute the air.
4)Working principle
Canister is made up of electromagnetic coil,
armature and valve etc.. There is strainer on the
intake. The flow quantity passes canister valve is
correlate not only to electrical impulse duty ratio of
canister control valve output by ECU, but also to
the pressure difference between canister valve
intake and outlet. When there is no electronic
impulse, the canister control valve will shut down.
5)Working voltage: 9
—
16V
Working temperature :-30--120
℃
6)Malfunction and diagnosis method
l
Malfunction: Function invalidation.
l
Reason: some particle coming to inside of valve
causes erosion or poor sealing.
l
Service notice: 1, let the airflow direction be
accord with the regulation; 2, when there are
black particle inside of valve and causes the
control valve invalidation, the valve need to be
changed, please check the canister working
conditions; 3, avoid the water, fuel and other
liquid into valve during the service; 4, hang the
valve on the tube to avoid the transferring of
solid sound.
l
Simple measurement method: (disassemble the
Chart 3-20 Exterior Drawing of Canister
Solenoid
Connect To Main Relay
Canister Solenoid Valve
Chart 3-21 Circuit Diagram of Canister
Solenoid
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