Toyota 1HD-FT Repair Manual page 249

CH-4
CHARGING SYSTEM - ON-VEHICLE INSPECTION
Alternator
Voltmeter
4. VISUALLY CHECK ALTERNATOR WIRING AND
LISTEN FOR ABNORMAL NOISES
(a) Check that the wiring is in good condition.
(b) Check that there is no abnormal noise from the alter-
nator while the engine is running.
5. INSPECT DISCHARGE WARNING LIGHT CIRCUIT
(a) Turn the ignition switch "OW. Check that the dis·
charge warning light comes on.
(b) Start the engine. Check that the light goes off.
If the light does not operate as specified. troubleshoot
the discharge warning light circuit.
6. INSPECT CHARGING CIRCUIT WITHOUT LOAD
HINT: If
a
battery/alternator tester is available. con-
nect the tester to the charging circuit as per the
manufacturer's instructions.
(a) If a tester is not available. connect a voltmeter and
ammeter the charging circuit as follows:
• Disconnect the wire from terminal B of the alter-
nator and connect it to the negative (-) lead of
the ammeter.
• Connect the positive (+) lead of the ammeter to
terminal B of the alternator.
• Connect the positive (+ ) lead of the voltmeter to
terminal B of the alternator.
• Ground the negative (-) lead of the voltmeter.
(bl Check the charging circuit as follows:
With the engine running from idle to 2.000 rpm. check
the reading on the ammeter and voltmeter.
Standard amperege:
10Aorle••
Standard voltage:
At 25°C (77°F): 14.0 - 15.0 V
At 115°C (239°F): 13.5 - 14.3 V
If the voltmeter reading is more than standard voltage.
replace the IC regulator.
If the voltmeter reading is less than the standard
voltage. check the
Ie
regulator and alternator as fol-
lows:
• With terminal F grounded. start the engine and
check the voltmeter reading of terminal B.
• If the voltmeter reading is more than standard
voltage. replace the IC regulator.
• If the voltmeter reading is less than standard
voltage. check the alternator.
7. INSPECT CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2.000 rpm. turn on the
high beam headlights and place the heater blower
switch at "HI".
"""
Disconnect Wire
from Terminal B
et---T--,
Battery
CH