Mitsubishi S4Q2 User Manual

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Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
ALTERNATOR
ENGLISH
ELECTRICAL SYSTEM
28.1.2 Inspection of adjustment voltage
(unit with integrated IC regulator)
1. Disconnect the cable from the positive (+) terminal
of the battery, and connect an ammeter between
the terminal and cable.
2. Connect a voltmeter between terminal L and
ground.
3. Make sure that the voltmeter indicates “0” when
the starter switch is turned off.
Make sure that the voltmeter indicates a voltage
level sufficiently lower than the battery voltage
when the starter switch is turned on (without
starting the engine).
4. Short-circuit the terminal of the ammeter, and start
the engine.
5. Read the indication (adjustment voltage) on the
voltmeter with the ammeter indicating 5 A or lower,
the engine operating at 1800 to 2500 rpm, and the
lamp switches turned off.
Unit: V
28.1.3 Inspection of output (unit with
integrated IC regulator)
1. Disconnect the grounding cable from the battery.
2. Disconnect the wire from terminal B of the
alternator, and connect an ammeter. Connect a
voltmeter between terminal B and ground.
3. Connect the grounding cable to the battery.
4. Start the engine.
5. Immediately after the engine starts, turn on all load
devices such as lamps.
6. Increase the engine speed. When the voltmeter
indicates 27.0 V, read the maximum current at the
specified alternator rotation speed.
If the measured value conforms to the standard
value, the alternator is normal.
Figure 187 Inspection of adjustment voltage
12V
+-
+
-
A
V
+
L
R
Switch
Voltmeter
24V (option)
Ammeter
Battery
Item
Standard
Value
V-kW
Adjustment
voltage at 20°C
14.7 ± 0.5 12-50
Option
28.5 ± 0.5
Option
24-25
24.35
Figure 188 Wiring diagram for output test (unit with
integrated IC regulator)
L
R
B
+
V
A
Switch
Voltmeter
Ammeter
Charge
lamp

Mitsubishi S4Q2 Specifications

General

Brand	Mitsubishi
Model	S4Q2
Category	Engine
Language	English