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1494 Leak Detection Pump (LDP) pressure switch problem - electrical or the pump itself.
1495 Leak Detection Pump (LDP) pressure switch problem - the solenoid circuit.
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P1495 Leak Detection Pump
Break/make
P1494 Leak Detect Pump
signal improbable
ko tieši šīs pumpis ietekmē ,dzinēja darbību vai kārbas? Vandījos pa manuāli īsti nevarēju saprast ko šis dara ,google tulkotājs interesanti tulko

Varbūt kāds var apskaidrot?

LEAK DETECTION PUMP
The leak detection pump is a device used to detect
a leak in the evaporative system.
The pump contains a 3 port solenoid, a pump that
contains a switch, a spring loaded canister vent valve
seal, 2 check valves and a spring/diaphragm.
Immediately after a cold start, when the engine
temperature is between 40°F and 86°F, the 3 port
solenoid is briefly energized. This initializes the
pump by drawing air into the pump cavity and also
closes the vent seal. During non-test test conditions,
the vent seal is held open by the pump diaphragm
assembly which pushes it open at the full travel position.
The vent seal will remain closed while the
pump is cycling. This is due to the operation of the 3
port solenoid which prevents the diaphragm assembly
from reaching full travel. After the brief initialization
period, the solenoid is de-energized, allowing
atmospheric pressure to enter the pump cavity. This
permits the spring to drive the diaphragm which
forces air out of the pump cavity and into the vent
system. When the solenoid is energized and de-energized,
the cycle is repeated creating flow in typical
diaphragm pump fashion. The pump is controlled in
2 modes:
PUMP MODE: The pump is cycled at a fixed rate
to achieve a rapid pressure build in order to shorten
the overall test time.
TEST MODE: The solenoid is energized with a
fixed duration pulse. Subsequent fixed pulses occur
when the diaphragm reaches the switch closure
point.
The spring in the pump is set so that the system
will achieve an equalized pressure of about 7.5 inches
of water.
When the pump starts, the cycle rate is quite high.
As the system becomes pressurized, pump rate drops.
If there is no leak, the pump will quit. If there is a
leak, the test is terminated at the end of the test
mode.
If there is no leak, the purge monitor is run. If the
cycle rate increases due to the flow through the
purge system, the test is passed and the diagnostic is
complete.
The canister vent valve will unseal the system
after completion of the test sequence as the pump
diaphragm assembly moves to the full travel position.

runa ir par bākas ventilācijas sistēmu. visai sarežģīta un cimprelīga lieta par godu ekoloģijai. parasti problēma ir sliktos trubu savienojumos. pats pumpītis retāk iziet no ierindas, bet arī iespējams.

man bākas ventilācija vispār ir noglušīta! Tad jau sanāk ,ka dzinēja un kārbas darbību šī problēma neietekmē.