Vaz 21213, Руководство по ремонту, Страница: 168 / 222

Table 7-7
Coolant temperature sender specification
Temperature, Supply voltage, Resistance,
°ë volts Ohm
30 8 1350-1880
50 7.6 585-820
70 6.85 280-390
90 5.8 155-196
110 4.7 87-109
Low oil pressure warning light switch. The switch is fitted
to the cylinder head. The switch contacts should close and open
at 20-60 kPa (0.2-0.6 kgf/cm
2
).
Fuel gauge sender. The sender unit is located in the fuel
tank and is secured by nuts. The sender has an alternating Ni-Cr
wire resistor. The resistor slide contact is operated by the float
lever. Another slide contact, fitted to the shorter end of the lever,
triggers the fuel reserve warning lamp, when only 4 to 4.6 litres of
petrol are left in the tank.
The sender resistance should be (250±12) Ohm for an empty
tank, (66±6) Ohm for a half filled tank and (20±3) Ohm for a full
tank.
Handbrake-on warning lamp relay.
The relay of Pë-492
model is intended for intermittent light of the handbrake «on»
warning lamp. It is fitted to the wires on the left-hand side beneath
the instrument panel.
The number of the relay ons/offs per minute should be in the
range of 60-120 at 10.8 to 15 volts within -40 to +40°ë. The wind-
ing resistance is 26 Ohm.
The relay of PC-492 model is out of use starting from 1995,
therefore when the handbrake is applied, the warning lamp lights
steadily.
Carburettor solenoid - control
Electronic control unit - testing
Sound electronic control unit 4 (Fig.7-41) should cut off sole-
noid 5 when the engine speed reaches 2100 rpm and operate it
when the engine slows down to 1900 rpm, if the idle switch is
earthed.
Start testing the control unit with checking its correct wiring.
Check the control unit operation using a voltmeter (ranged 0-
15 volts) in the following sequence:
- disconnect the green wire from the idle switch and earth the
wire end;
- connect the voltmeter to the control unit using special con-
nector 2 (Fig.7-42);
- start the engine and let it running, gradually increase the
speed while observing the voltmeter readings: after start-up the
voltmeter should read at least 10 volts with an instantaneous drop
as low as 0.5 volts at the moment the solenoid shuts off;
- once the solenoid is shut off, gradually decrease the engine
speed until the solenoid cuts in again - there should be an instant
surge in voltage to 10 volts at least;
- run the engine at 2200-2300 rpm, disconnect the carburet-
tor idle switch earth lead and then reconnect it. The solenoid
should cut in when the earth wire is disconnected and cut off
when the wire is reconnected to earth.
Note. The control unit can be checked without a voltmeter by
audible clicks the solenoid produces at cut-in or cut-off.
166
Fig.7-41. Fuel cutoff solenoid control system wiring diagram:
1 - ignition switch; 2 - ignition solenoid; 3 - ignition coil; 4 - control unit; 5 - fuel cutoff solenoid; 6 - idle switch
Fig.7-42. Control unit check:
1 - control unit; 2 - adapter and voltmeter; Ä - to vehicle wiring harness