REGULATED VOLTAGE TEST <4A9, 4B1>





1.

  • Alternator installation
  • Check that the battery installed in the vehicle is fully charged.
    (Refer to GROUP 54A - Battery - On-Vehicle Service - Battery Check .)
  • Drive belt tension
    (Refer to GROUP 11A - On-Vehicle Service - Drive Belt Tension Check and Adjustment ). <4A91>
    (Refer to GROUP 11C - On-Vehicle Service - Alternator and Others Belt Tension Check ). <4B10>
    (Refer to GROUP 11E - On-Vehicle Service - Alternator and Others Belt Tension Check ). <4B11>
  • Fusible link
  • Abnormal noise from the alternator while the engine is running
2.
3.
4.
5.
6.
7.
8.
note If the voltage is 0 V, the cause is probably an open circuit in the wire or fusible link between the alternator "S" terminal and the battery (+) terminal.
9.
10.
11.
12.
13.

note When the voltage is approximately 12.8 V, the G-terminal is supposed to have a short circuit to the earth. Check the circuits relating to the G-terminal on the alternator.
(Refer to GROUP 13A - Troubleshooting - Inspection chart for trouble symptoms ) <4A9>
(Refer to GROUP 13B - Troubleshooting - Inspection chart for trouble symptoms ) <4B1>
(Refer to GROUP 13C - Troubleshooting - Inspection chart for trouble symptoms ) <4B1-Turbo>
14.
15.
16.
17.
18.
19.
20.

Voltage Regulation Table



STANDARD VALUE:
Inspection terminal
 Voltage regulator ambient temperature °C
 Voltage V
Terminal "S"
 -20
 14.2 - 15.4
20
 13.9 - 14.9
60
 13.4 - 14.6
80
 13.1 - 14.5