Vaz 21213, Руководство по ремонту, Страница: 189 / 222

Apply sealant on the thread of the housing securing screws.
Throttle position sensor.
Before fitting the TP sensor, fully
close the throttle, then turning the sensor anticlockwise, align the
flats of the shaft with the sensor pickup lever.
Tighten the securing screws.
WARNING. Never clean or wash the TP sensor or idle air
control valve with petrol or other cleaners.
Idle air control valve. Replace the sealing washers with new
ones. The idle air control valve is of a taper shape, 10 mm diam-
eter. Always replace it with a new valve of the respective model.
Before fitting the idle air control valve to the throttle housing,
check the distance between the mounting flange and valve end.
Remember, an excess protrusion of the valve can cause dam-
ages.
The distance should be less than 23 mm. When with a new
idle air control valve it is in excess of 23 mm, sway the valve with
your hand, pushing it in.
To avoid damage, do not hand push the valve which was in
use. For this purpose it is recommended to use a diagnostic tool
or specialized monitor.
After having refitted the idle air control valve and central injec-
tion unit, reconnect a diagnostic tool to the diagnostic plug and com-
mand the ECM to reset the parameters of the idle air control valve.
Throttle housing. When reassembling the central injection
unit, it is a good practice to renew the sealing gasket of the fuel
supply housing.
Scrape the gasket from the throttle housing and vacuum
housing, fit a new gasket.
Fuel supply pressure - checking
Carry out the following checks: inspect the fuel delivery lines
for leaks, check the fuel pressure regulator and electric fuel pump
for satisfactory operation.
Relief the pressure in the fuel line, as described earlier for
removal of the central injection unit.
Reconnect the wiring plug to the fuel pump.
Disconnect the fuel pipe from the fuel supply pipe union of the
central injection unit, then using a T-piece connect a pressure
gauge between the pipe union and fuel pipe.
Turn the ignition key to the position «Ignition».
Check the pressure gauge is functional, check its connection
shows no leaks. The pressure should be within 190-210 kPa.
When there is no pressure, listen to hear the fuel pump cuts in
when the ignition key is turned to the position «Ignition» (the
pump operation and its relay clicks can be distinctly heard in the
passenger compartment).
Should the fuel pump fails to operate, check the pump circuit.
After two seconds of operation the fuel pump shuts off, as no
187
Fig.9-3. Central injection unit:
1 - fuel pressure gauge; 2 - injector; 3 - connection for fuel delivery pipe; 4 -
throttle position sensor; 5 - connection for fuel return hose to tank; 6 - pipe union
for canister purge hose; 7 - pipe union for crankcase vent hose; 8 - pipe union
for MAP sensor hose; 9 - idle air control valve; 10 - quadrant for throttle actua-
tion from pedal in the passenger compartment
Fig.9-4. Components and assemblies of central injection unit:
1 - throttle stop screw (preset at the factory); 2 - fuel pressure regulator cover;
3 - spring; 4 - diaphragm; 5 - air cleaner gasket; 6 - injector; 7 - holder; 8 - fuel
delivery pipe union; 9 - fuel return pipe union; 10 - throttle position sensor; 11 -
throttle shaft; 12 - grommet; 13 - vacuum pipes housing; 14 - idle air control
valve