The ECU can indirectly control the purge airflow
through controlling the charging time of the carbon
canister solenoid valve based on the signals provided
by various sensors of the engine.
Fault diagnosis: The ECU doesn’t have the function of
self-diagnosis for the carbon canister control valve, but
has the function of self-diagnosis for the driving stage
of control valve of carbon canister. If the driving state
of the control valve of carbon canister is short or
overloaded to the battery voltage, short to ground or
open, the basic memory of the closed loop control of
fuel quantity will be closed, the memory of idling air
demand quantity will be closed and the memory data at
that time is valid. The common malfunctions of engine
are unstable idling or excessive high idle speed under
the malfunction of the solenoid valve of carbon
canister.
Pins:
1# pin is connected to the 87# pin on output terminal of
the main relay;
2# pin is connected to the 46# pin of ECU.
Troubleshooting: The blockage and crack of the
carbon canister will result in the increase of air intake.
※ Steel fuel distribution pipe assembly
Function: Store and distribute the fuel and provide a
relative stable pressure for the fuel injection system so
as to achieve the uniform fuel supply pressure and
quantity for each cylinder and stable operation of
engine.
Structure: The fuel distribution pipe assembly is
comprised of fuel distribution pipe (KVS-S) and fuel
injector (EV).
Installation requirement: The connection of fuel pipe
and rubber hose shall be fastened by clamp. The model
of the selected clamp shall match to the rubber hose to
ensure the seal connection between the fuel pipe and
the rubber hose.
Fault diagnosis: There is seldom possibility for the
malfunction occurrence in the main fuel supply pipe.
Most of the malfunctions, which result in the leakage of
the fuel system, are caused by poor assembly, so proper
note shall be paid during installation that any used
O-oil seal shall not be used again and appropriate
lubricant is allowed to be painted during assembly.
Carbon canister control valve
Carbon canister control valve
Circuit diagram of the solenoid valve
of the charcoal canister TEV-2