ENGINE ELECTRICAL
-
Charging System
8-227
(7) Set an engine tachometer.
NOTE:
l For engine tachometer setting procedure,
refer to GROUP 9
-
Service Adjustment
/
L
Procedures.
(8) Connect the negative cable of the battery.
(9) Leave the engine hood opened.
(10)Check that the voltmeter reading is equal to the
battery voltage.
NOTE:
l
When the voltmeter reading is OV, an
open-
circuited wiring or fusible link between
terminal B of the generator and the positive
terminal of the battery is suspected.
(1 l)Set the lighting switch to “ON” to light the
headlamps, and then start the engine.
(12)Set
the headlamps to high beam and set the
heater blower switch to HI. Immediately in-
crease the engine speed to 2,500 rpm and read
the maximum output current value indicated by
the ammeter.
Limit value: 70% of nominal output current
NOTES:
l
For the nominal output current value, refer to
General Specifications.
l
Since the charge current abruptly decreases
after starting the engine, perform the
above-
mentioned operations quickly when reading
ii
the maximum current value.
l
The output current value varies with the size
of electric load and the temperature of the
generator itself.
When the electric load of the vehicle under
test is small, the specified output current
may be unavailable even if there is nothing
wrong with the generator. In such a case,
leave the headlamps lighted to discharge the
battery, or get another car and use the lamps
and other devices of the car to increase the
electric load, and then re-perform the test.
If the temperature of the generator itself or
the ambient temperature is too high, the
specified output current may be unavailable,
either. In such a case, let the generator cool
down before retesting.
(13)Check
to ensure that the ammeter reading is in
excess of the limit value. If the reading is lower
than the limit value, and there is nothing wrong
with the output line of the generator, remove
the generator from the engine and check it.
(14)After
the output current test has been com-
pleted, reduce the engine speed to the idling
speed.
(15)Place
the ignition switch at “OFF”.
(16)Disconnect the negative cable of the battery.
(17)Remove the test ammeter, voltmeter and en-
gine tachometer.
(18)Connect the output line of the generator to
terminal B of the generator.
(19)Reconnect the negative cable of the battery.
REGULATOR VOLTAGE TEST
The test is performed to check whether the voltage
regulator is properly controlling the output voltage of
the generator.
(1)
(2)
(3)
(4)
(5)
(6)
Before the regulator voltage test is performed,
be sure to check the following items.
l Mounted condition of generator
l
Check to ensure that the battery mounted in
the vehicle is in fully charged condition.
(Refer to GROUP 8
-
Battery.)
l Generator drive belt tension (Refer to
GROUP 0
-
Maintenance Service.)
l Fusible link condition
l
Whether strange sound is heard from gener-
ator during engine rotation
Place the ignition switch at “OFF”.
Disconnect the negative cable of the battery.
Connect a digital voltmeter between terminal S
of the generator and ground. (Connect the
positive lead wire of the voltmeter to terminal S.
Connect the negative lead wire of the voltmeter
to a good ground or the battery negative
terminal.)
Disconnect the output line of the generator from
terminal B of the generator.
Connect a
O-IOOA
test DC ammeter between
terminal B and the disconnected output line in
series. (Connect the positive lead wire of the
ammeter to terminal B and connect the negative
lead wire of the ammeter to the disconnected
output line.)
i
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