Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 11. STARTING-CHARGING 02. Generator
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W1860BE.book Page 3 Tuesday, January 28, 2003 11:01 PM
GENERATOR
STARTING/CHARGING
2. Generator
The generator has a built-in regulator which provides diagnostic functions in addition to a voltage
regulating function as follows:
1) Voltage regulation
The on-off operation of transistor connects and disconnects the field current circuit, providing a con-
stant level of output voltage.
2) Diagnosis warning
When any of the following problems occur, the charge lamp illuminates.
(1) No voltage generation
Brush wear exceeds specified wear limits, field coil circuit is broken, etc.
(2) Excessive output
Output voltage is greater than (approx) 16 volts.
(3) Terminal B disconnection
Harness is disconnected from generator terminal B.
(4) Terminal S disconnection
Harness is disconnected from generator terminal S. In this case, voltage is slightly greater than
specified regulated voltage; however, voltage regulation is still controlled and the battery is pre-
vented from becoming overcharged.
SC(H4SO)-3
W1860BE.book Page 4 Tuesday, January 28, 2003 11:01 PM
GENERATOR
STARTING/CHARGING
B
(6)
(1)
B
T
(7)
(2)
Tr3
F S S
(10)
(3) Tr1
(8)
L L (11)
Tr2
(9)
(4) E
(12)
: (A)
(5) : (B)
SC-00057
(1) Positive side diodes (3 pcs.) (7) Energizing circuit (A) Generator terminal
(2) Additional diodes (2 pcs.) (8) Constant voltage circuit (B) Regulator terminal
(3) Stator coil (9) Diagnostic and warning circuit
(4) Field coil (10) Ignition switch
(5) Negative side diodes (3 pcs.) (11) Charge light
(6) Trio diodes (3 pcs.) (12) IC regulator
SC(H4SO)-4
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