Vaz 21213, Руководство по ремонту, Страница: 155 / 222

up to 1500 rpm or the thicker spring bracket for speeds over 1500
rpm. Increase the spring tension for a smaller angle (retard) or
decrease the spring tension for a bigger angle (advance).
To obtain the vacuum advance pattern, connect the vacuum
advance unit to the vacuum pump of the tester.
Operate the tester motor and run the distributor driveshaft at
1000 rpm. Watching the tester graduated disc, note the angle at
which one of the four sparking events occurs.
Smoothly increase the vacuum through every 26.7 gPa (20
mm Hg) and make note of the advance angle with respect to the
initial value. Compare the resulting advance pattern with that in
Fig.7-22.
Note the Hall sensor mounting plate invariably returns to its
original position after vacuum has been removed.
Hall sensor.
The Hall sensor produces the output voltage if
there is a steel vane in the air gap. The output is around zero
volts when there is no vane in the gap.
With the distributor removed from the engine, the sensor can
be tested as illustrated in Fig.7-24 at supply voltage of 8-14 volts.
While slowly rotating the distributor shaft, measure the output
using a voltmeter. The voltage should change sharply between
the low level (0.4 volt maximum) and the high level, which must
be maximum 3 volts below the supply voltage.
The Hall sensor can be tested in the vehicle as shown in
Fig.7-23. Adapter 2 and a voltmeter are connected across the
distributor connector and wiring harness connector. Switch on
the ignition and measure the sensor output with a voltmeter,
while slowly rotating the crankshaft with a special tool. The out-
put voltage readings should meet the specification.
Ignition coil
Check resistance of the winding and insulation.
For the ignition coil of 27.3705 model the resistance at 25 ° ë
should be 0.45±0.05 Ohm for the primary winding and 5±0.5
kOhm for the secondary winding. For the ignition coil of 8352.12
model the resistance of the primary winding is 0.42±0.05 Ohm,
while that of the secondary winding is 5±1 kOhm.
153
Fig.7-24. Wiring diagram for Hall sensor test on the removed ignition
distributor:
1 - ignition distributor; 2 - 2kOhm resistor; 3 - voltmeter of minimum 15 v scale
and minimum 100 kOhm internal resistance; 4 - view on the ignition distributor
connector
Fig.7-23. Wiring diagram for Hall sensor in-vehicle test:
1 - ignition distributor; 2 - adapter with voltmeter of at least 15 v scale and inter-
nal resistance of minimum 100 kOhm; 3 - view on ignition distributor connector
Fig.7-20. Checking the ignition distributor on the test bench:
1 - spark control module; 2 - ignition distributor; Ä - to test bench «plus» terminal;
Ç - to test bench «breaker» terminal
Fig.7-21. Centrifugal advance ignition distributor map:
Ä - advance timing, degrees; n - ignition distributor shaft speed, rpm
Fig.7-22. Ignition distributor vacuum advance map :
Ä - advance, degrees; ê - vacuum gPa (mm Hg)