Lexus SC300 / Lexus SC400. Manual - part 693
7.
INSPECT CHARGING CIRCUIT WITHOUT LOAD
HINT: If a battery/alternator tester is available, connect the
tester to the charging circuit as per manufacturer’s instruc-
tions.
(a) If a tester is not available, connect a voltmeter and
ammeter to the charging circuit as follows:
•
Disconnect the wire from terminal B of the
alternator and connect it to the negative (–) probe
of the ammeter.
•
Connect the positive (+) probe of the ammeter to
terminal B of the alternator.
•
Connect the positive (+) probe of the voltmeter to
terminal B of the alternator.
•
Ground the negative (–) probe of the voltmeter.
(b) Check the charging circuit as follows:
With the engine running from idling to 2,000 rpm, check the
reading on the ammeter and voltmeter.
Standard amperage: 10 A or less
Standard voltage: 13.9–15.1 V at 25
°
C (77
°
F)
13.5–14.3 V at 115
°
C (239
°
F)
If the voltmeter reading is greater than standard voltage, re-
place the IC regulator.
If the voltmeter reading is less than standard voltage, check
the IC regulator and alternator as follows:
•
Remove the engine under cover.
•
With terminal F grounded, start the engine and
check the voltmeter reading of terminal B.
•
If the voltmeter reading is greater than standard
voltage, replace the IC regulator.
•
If the voltmeter reading is less than standard
voltage, check the alternator.
•
Reinstall the engine under cover.
–
CHARGING SYSTEM
On–Vehicle Inspection
CH–7