MITSUBISHI ENDEAVOR 2004 Service Repair Manual

See REGULATOR VOLTAGE SPECIFICATIONS TABLE
.
14. After the test, lower the engine speed to idle.
15. Turn the ignition switch to the LOCK (OFF) position.
16. Disconnect the engine tachometer or scan tool MB991958.
17. Disconnect the negative battery cable.
18. Disconnect the ammeter and voltmeter.
19. Connect the negative battery cable.
20. Run the engine for 10 minutes at an idle.
REGULATOR VOLTAGE SPECIFICATIONS
WAVE PATTERN CHECK USING AN OSCILLOSCOPE Abnormal Waveforms The size of the waveform patterns can differ greatly, depending on the adjustment
of the variable knob on the oscilloscope. See Fig. 6
.
Identification of abnormal waveforms is easier when there is a large output current
(regulator is not operating). Waveforms can be observed when the headlights are
illuminated.
Check the conditions of the generator malfunction light (illuminated/not
illuminated
) also, and carr
y out a total check.
Ambient Temp. °F (°C)
Voltage
Terminal S-4 (-20)
14.2-15.4
68 (20)
13.9-14.9
140 (60)
13.4-14.5
176 (80)
13.1-14.2

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2004 STARTING & CHARGING SYSTEMS Generators & Regulators - Endeavor

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2004 STARTING & CHARGING SYSTEMS Generators & Regulators - Endeavor

Fig. 6: Identifying Abnormal Waveforms

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Measurement Method Connect the oscilloscope special patterns pick-up to the generator B terminal. See
Fig. 7
.
Fig. 7: Connecting Oscilloscope

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Standard Waveform NOTE: The voltage waveform of the generator B terminal can
undulate. This waveform is produced when the regulator
operates according to fluctuations in the generator load
(current), and is normal for the generator. If the ripple
height is abnormally high (approximately 2V or more during
2004 Mitsubishi Endeavor Limited
2004 STARTING & CHARGING SYSTEMS Generators & Regulators - Endeavor

For standard waveform observation conditions, see Fig. 8
.
Fig. 8: Identifying Observation Conditions

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COMPONENT TESTING BRUSH 1. Replace the brush is the brush protrusion length is below 0.08" (2 mm). See
Fig. 9
.
2. The brush can be removed by unsoldering the brush lead wire. See Fig. 10
.
3. When installing a new brush, push the brush in to the brush holder, and solder
the lead wire.
idling), the wires between the generator B terminal and the
battery have broken due to fuse blowing, etc. The generator
is usually operating properly.

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2004 STARTING & CHARGING SYSTEMS Generators & Regulators - Endeavor

Fig. 9: Identifying Protrusion Length

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Fig. 10: Locating Soldered Wires

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ROTOR 1. Check the continuity between the slip rings of the field coil. If the resistance
value is not within 2-5ohm, replace the rotor. See Fig. 11
.
2. Check the continuity between the slip ring and the core. If there is continuity,
re
place the rotor. See Fig. 12
.

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Fig. 11: Checking Continuity Between Slip Rings & Field Coil

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Fig. 12: Checking Continuity Between Slip Ring & Core

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RECTIFIER 1. Check the continuity between the positive rectifier and the stator coil lead
connection terminal with a tester. If there is continuity between the terminals,
the diode is shorted, so replace the rectifier. See Fig. 13
.
2. Check the continuity between the negative rectifier and the stator coil lead
connection terminal with a tester. If there is continuity between the terminals,
the diode is grounded, so replace the rectifier. See Fig. 14 .
3. Check the continuity of the 3 diodes by connecting an ohmmeter to both ends
of each diode. If there is continuity between the directions, or if there is no
continuit
y, the diode is dama
ged, so re
place the rectifier. See Fi
g. 15
.

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Fig. 13: Checking Continuity Between Positive Rectifier & Stator Coil

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Fig. 14: Checking Continuity Between Negative Rectifier & Stator Coil

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2004 Mitsubishi Endeavor Limited
2004 STARTING & CHARGING SYSTEMS Generators & Regulators - Endeavor