
Instrument cluster - dismantling and reassembly
Undo the trip counter knob by pulling it outward, then remove
the surround and glass, having first released its bottom edge
from the retaining spring wire. Undo the nuts holding the instru-
ments to the PCB and withdraw the instruments.
Reassembly is the reverse of the dismantling procedure.
Instruments - fault diagnosis
Coolant temperature gauge
If the gauge needle constantly stays at the low end of scale,
switch on the ignition, disconnect the lead from the gauge and
connect its end to earth through a resistor of 20 - 50 Ohm.
If the needle swings, the gauge is faulty and must be
renewed. If the needle does not move, remove the instrument
cluster, and without disconnecting its wiring, pull out the red con-
nector, then with the ignition switched on, earth terminal 13
(Fig.7-39) of the instrument cluster white connector through the
20-50 Ohm resistor. The needle swings if the gauge is sound but
the wire between the sender and the instrument cluster is dam-
aged. When the needle does not swing, renew the coolant tem-
perature gauge or the complete instrument cluster.
When the needle stays in the red area, then with the ignition
switched on, disconnect the sender wire. The sender is faulty if
the needle returns to the low end of scale. If the needle remains
in the red area, then either the lead is earthed or the gauge is
damaged. The gauge can be checked through disconnecting the
white terminal connector from the instrument cluster. With the
ignition switched off, the needle should be at the low end of the
scale.
Fuel gauge
The checking procedure for the fuel gauge is similar to the
one described earlier.
If the needle stays at the low end of the scale and does not
move when the pink wire is disconnected from the gauge and
earthed, check the fuel gauge. To do this, remove the instrument
cluster, disconnect the white wiring connector, then with the igni-
tion switched on, earth terminal 11 of the instrument cluster white
connector through a resistor of 20-50 Ohm. If the gauge is sound,
the needle moves.
If the needle always stays at the high end of scale, check the
gauge through disconnecting the instrument cluster white con-
nector. If the gauge is sound, the needle returns to the low end
of scale with the ignition switched on.
Instruments - checking
Coolant temperature gauge.
The gauge is associated with
a sender in the cylinder head. At 700 Ohm the needle should be
at the low end of the scale, while at 77-89 éhm it should stay at
the beginning of the red area of scale.
Fuel gauge.
The gauge is coupled with a sender in the fuel
tank. The sender is used to operate the fuel reserve warning light
when only 4 to 6 litres of petrol are left in the fuel tank.
The sender resistance of 238-262 Ohm corresponds to the
«empty» reading, 59-71 Ohm - to the half filled tank reading (nee-
dle is in the middle of the scale), while 7-23 Ohm - to the «full»
reading (mark 1).
Speedometer.
Check the speedometer by rotating its drive
shaft at various speeds. The speedometer specification is shown
in Table 7-6.
Table 7-6
Speedometer checking data
Drive shaft
Speedometer
speed, rpm
reading, km/h
500
31-35
1000
62-66.5
1500
93-98
2000
124-130
2500
155-161.5
Tachometer.
The tachometer measures the frequency of
voltage pulses in the ignition primary circuit.
Check the speedometer on a tester unit which simulates the
vehicle ignition system. Connect the tachometer to the tester cir-
cuitry as it done in the vehicle, set the primary circuit voltage to
14 volts and the spark gap in the tester to 7 mm. Turn the dis-
tributor shaft so that the tachometer needle reaches one of the
main graduations of the scale. At this moment check the distrib-
utor shaft speed variation is 250 to -70 rpm.
Voltmeter.
The voltmeter was fitted to the vehicles before
1996, then it was replaced by the low battery warning light; refer
to Fig.7-4 for the relevant wiring diagram.
Check the voltmeter by applying a known voltage. At voltage
below (11.3±0.35) volts the voltmeter LED should light steadily.
When the voltage is between (11.3±0.35) volts and (16±0.35)
volts, the LED should not light. When the voltage is above
(16±0.35) volts, the LED should flash. The voltmeter operates
with a 5 second delay.
Switches and senders
Coolant temperature sender.
The sender has an integrated
thermal resistor which resistance alters depending on the coolant
temperature. The sender specification is shown in Table 7-7.
165
Содержание 21213
Страница 1: ...VAZ VEHICLES VAZ 21213 VAZ 21214 VAZ 21214 20 VAZ 21215 REPAIR MANUAL ...
Страница 8: ...8 Fig 2 2 Front sectional view of the engine ...
Страница 135: ...135 ...
Страница 136: ...136 ...