golf 3 VR6: piece introuvable

Dylan 07 a écrit:salut Ksper;

oui je suis a 90 % sûr que l'electrovanne est foutue, car en la débranchant, le moteur tourne pareil.
Et donc tu dis que tu a une electrovanne en stock ????

Dylan 07 a écrit:salut Ksper;

oui je suis a 90 % sûr que l'electrovanne est foutue, car en la débranchant, le moteur tourne pareil.
Et donc tu dis que tu a une electrovanne en stock ????

Dylan 07 a écrit:Merci ArM pout répondre a mes post.
oui, quand je débranche la fiche de la vanne, il n'y a plus ce bruit de "
clic clic..."
, donc je deduit que c'est elle qui fait ce bruit.
pour essayer, j'ai mis un gicleur a la place de la vanne et ça me paraît pas mal mais j'ai pas tester en roulant.

Bon, il faut que je demonte la sonde lambda, mais comment savoir son efficacité?

The oxygen sensor (G39) is made of a ceramic material called zirconium
dioxide. The inner and outer surfaces of the ceramic material are
coated with platinum. The outer platinum surface is exposed to the
exhaust gas, while the inner surface is exposed to the outside air.

The difference in the amount of oxygen contacting the inner and outer
surfaces of the oxygen sensor creates a pressure differential which
results in a small voltage signal in the range of 100 to 1000 mV.
The amount of voltage that is produced is determined by the fuel
mixture.

The oxygen sensor (G39) is heated electrically to keep it at constant
operating temperature. The heater also ensures that the sensor comes
to operating temperature quickly.

The sensor has four wires. Two are for the heating element (ground and
power). One wire is a signal wire for the sensor and one for the
ground.

* Signal usage: *

The base injection time is corrected according to the voltage signal
from the oxygen sensor to maintain a fuel/air ratio of approximately
14.7:1.
This allows the three-way catalytic converter to operate at its maximum
efficiency.

If the fuel mixture is lean (excess oxygen), the oxygen sensor will send
a low voltage signal (about 100mV) to the ECU.

If the fuel mixture is rich (lack of oxygen), the oxygen sensor will
send
a voltage signal (about 900 mV) to the ECU.

* Substitute function: *

There is no substitute function for oxygen sensor (G39). If signal
fails,
no oxygen sensor regulation takes place.

* Self-diagnosis: *

The ECU recognizes a fault if no reasonable signal voltage range is
attained within five minutes after engine start with an engine coolant
temperature over 40° C (104° F).

The ECU also recognizes a open circuit in the wiring or a short circuit
to ground andshort circuit to positive (sensor heating).

Fuel vapors from the fuel tank are vented to the carbon canister.
When the engine is warm and above idle speed, the vapors will be
drawn into the intake manifold via the carbon canister.

Depending on engine load and oxygen sensor signal, a frequency valve
will regulate the quantity of vapors entering the intake manifold from
the carbon canister

* Carbon Canister Frequency Valve (N80) *

The ECU determines the duty cycle of the frequency valve to regulate
the flow of fuel vapors from the carbon canister to the engine.

When no current is supplied to the valve, it remains in the open
position.
The valve is closed (duty cycle 100%) when the cold engine is started.

* Triggering: *

The Carbon Canister Frequency Valve (N80) begins to operate after
oxygen sensor operation has begun.

Valve operation is load- and speed-dependent during driving operation.
The valve is completely open at full throttle and completely closed
during deceleration fuel shut-off.

* Substitute function: *

If power to the valve is interrupted, the valve remains completely open.
This could lead to rough running at idle speed and during partial load
acceleration.

* Self-diagnosis: *

The ECU recognizes open circuits and short circuits in the component.