Mitsubishi Galant. Manual - part 346
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-10
REGULATED VOLTAGE TEST
M1161001100064
Required Special Tools:
•
MB991502: Scan Tool (MUT-II)
•
MB991519: Generator Harness Connector
This test determines whether the voltage regulator is
correctly controlling the generator output voltage.
1. Always be sure to check the following before the
test:
•
Generator installation
•
Check to be sure that the battery installed in the
vehicle is fully charged. (Refer to GROUP 54A,
Battery
−
On-vehicle Service
−
Battery Check
•
Generator drive belt tension (Refer to GROUP
00, Maintenance Service
−
Drive Belts
•
Fusible link
•
Abnormal noise from the generator while the
engine is running
2. Turn the ignition switch to the "LOCK" (OFF)
position.
WARNING
Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.
3. Disconnect the negative battery cable.
4. Use the special tool (Generator harness
connector: MB991519) to connect a digital-type
voltmeter between the generator "S" terminal and
the ground. (Connect the positive lead of the
voltmeter to the "S" terminal, and then connect the
negative lead of the voltmeter to a secure ground
or to the negative battery terminal.)
5. Disconnect the generator output wire from the
generator "B" terminal.
6. Connect a DC test ammeter with a range of 0
−
100 A in series between the "B" terminal and the
disconnected output wire. (Connect the positive
load of the ammeter to the "B" terminal, and then
connect the negative lead of the ammeter to the
disconnected output wire.)
WARNING
Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.
7. Reconnect the negative battery cable.
8. Connect a tachometer or the scan tool
MB991502.
9. Turn the ignition switch to the "ON" position and
check that the reading on the voltmeter is equal to
the battery positive voltage.
NOTE: If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the generator "S" terminal and the battery positive
terminal.
10.Check to be sure that all lights and accessories
are off.
11.Start the engine.
12.Increase the engine speed to 2,500 r/min.
13.Read the value displayed on the voltmeter when
the current output by the generator becomes 10 A
or less.
AKX01215
LOAD
AMMETER
CHARGING
WARNING
LIGHT
IGNITION
SWITCH
BLACK
GENERATOR
INDICATOR LAMP
(BRAKE WARNING
LIGHT, etc.)
G
S
L
FR
BLUE
YELLOW
RED
VOLTMETER
(DIGITAL-TYPE)
BATTERY
+
-
PCM (A/T)
AC
MB991519