2004 MITSUBISHI ENDEAVOR engine

2004 STARTING & CHARGING SYSTEMS
Generators & Regulators - Endeavor
DESCRIPTION The charging system charges the battery with the generator output to keep the
battery charged at a constant level during varying electrical load. OPERATION Rotation of the excited field coil generates AC voltage in the stator. This alternating
current is rectified through diodes to DC voltage having a waveform. The average
output voltage fluctuates slightly with the generator load condition.
When the ignition switch is turned on, current flows in the field coil and initial
excitation of the field coil occurs. When the stator coil begins to generate power
after the engine is started, the field coil is excited by the output current of the stator
coil. The generator output voltage rises as the field current increases and it falls as
the field current decreases. When the battery positive voltage (generator S terminal
voltage) reaches a regulated voltage of approximately 14.4V, the field current is cut
off. When the battery positive voltage drops below the regulated voltage, the
voltage regulator regulates the output voltage to a constant level by controlling the
field current. In addition, when the field current is constant, the generator output
volta
ge rises as the en
gine s
peed increases. See Fig. 1
or Fig. 2
.
NOTE: See appropriate SELF DIAGNOSTICS article in ENGINE
PERFORMANCE to properly diagnose charging system.
2004 Mitsubishi Endeavor Limited
2004 STARTING & CHARGING SYSTEMS Generators & Regulators - Endeavor


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

For belt tension, see ADJUSTMENTS
.
TROUBLE SHOOTING 1. Is battery in good condition?
If Yes, then go to next step. If No, then charge or replace battery.
2. Is generator drive belt in good condition? If Yes, then go to next step. If No, then adjust belt tension or replace belt.
3. Does the generator malfunction light come on when the ignition switch is
turned on? If Yes, then go to next step. If No:
Check the ignition switch.
Check for burnt-out generator malfunction light.
Check the generator.
Check the generator malfunction light-related circuits.
4. Does the generator malfunction light go out after starting the engine? If Yes, then go to next step. If No, check the generator.
5. Is an oscilloscope available? If Yes, then go to next step. If No, then go to step 7 .
6. Does the oscilloscope show a normal wave pattern? If Yes, then go to next step. If No, then check the generator.
7. Turn the engine on and idle at 2500 RPM. Turn the headlights on with the
High Beams on. Be sure that there is voltage between generator terminal B and
the positive battery terminal of 0.5V or less. Check that the voltage between
the negative batter
y terminal and
generator bod
y is 0.5V or less. Are the

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

Fig. 3: Generator Output Line Voltage Drop Test (Typical)

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
1. Always be sure to check following before testing:
Generator installation. Generator drive belt tension. Fusible link. Abnormal noise form generator while engine is running.
2. Tune ignition switch to LOCK (OFF) position.
3. Disconnect ne
gative batter
y cable.
WARNING:Battery posts, terminals and related accessories
contain lead and lead compounds. Wash hands
after handling.

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

4. Connect a clamp-type DC test ammeter with a range of 0-150A to the
generator B terminal output wire.
5. Connect a digital-type voltmeter between the generator B terminal and the
positive battery terminal. (Connect the positive lead of the voltmeter to the B
terminal, and then connect the negative lead of the voltmeter to the positive
battery cable.)
6. Reconnect the negative battery cable.
7. Connect an engine tachometer or scan tool MB991958.
8. Leave the hood open.
9. Start the engine.
10. With the engine running at 2500 RPM, turn the headlights and other lights on
and off to adjust the generator load so that the value displayed on the ammeter
is slightly above 30A. Read the voltmeter. Voltage reading at or below limit
value means voltage drop between generator and batter is OK. There should be
a maximum voltage of 0.3V.
11. If the value displayed on the voltmeter is above the limit value, there is
probably a malfunction in the generator output wire. Check the wiring between
the
generator B terminal and the
positive batter
y terminal
(includin
g fusible
NOTE: The way of disconnecting the generator output wire and
of connecting the ammeter is possibly not found the
problem that the output current is dropping due to the
insufficient connection between terminal B and the
output wire.
NOTE: When the generator output is high and the value
displayed on the ammeter does not decrease to 30A,
set the value to 40A. Read the value displayed on the
voltmeter at this time. In the case the limit value
becomes maximum 0.4V. Adjust the engine speed by
gradually decreasing it until the value displayed on the
ammeter is 30A. Take a reading of the value displayed
on the voltmeter at this time

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

link). If a terminal is not sufficiently tight or if the harness has become
discolored due to overheating, repair and then test again.
12. After the test, run the engine at idle.
13. Turn off all lights and turn the ignition switch to the LOCK (OFF) position.
14. Disconnect the negative battery cable.
15. Disconnect the ammeter and voltmeter.
16. Connect the negative battery cable.
17. Run engine for 10 minutes at an idle.
OUTPUT CURRENT TEST Required special tool: MB991958: Scan Tool MUT-III Sub Assembly, MB991824:
V.C.I., MB991827 MUT-III USB Cable, MB5991910: MUT-III Main Harness A.
This test determines whether the generator outputs normal current. For best results,
use a char
ging system tester. If not available, follow the ste
ps below. See Fig. 4
.

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

Battery. Generator drive belt tension. Fusible link. Abnormal noise from the generator while the engine is running.
2. Turn the ignition switch to the LOCK (OFF) position.
3. Disconnect the negative battery cable.
4. Connect a clamp-type DC test ammeter with a range of 0-150A to the
generator B terminal output wire.
5. Connect a voltmeter with a range of 0-20V between the generator B terminal
and ground. (Connect the positive lead of the voltmeter to the B terminal, and
then connect the negative lead of the voltmeter to ground.)
6. Connect the negative battery cable.
7. Connect an engine tachometer or scan tool MB991958.
8. Leave the hood open.
9. Check to be sure that the reading on the voltmeter is equal to the battery
positive voltage.
10. After turnin
g on the headli
ghts, start the en
gine.
WARNING:Never use clips to connect the line. Loose
connections (for example, using clips) will lead
to a serious accident because of high current.
NOTE: If the voltage is 0 V, the cause is probably an open
circuit in the wire or fusible link between the generator
B terminal and the battery positive terminal or
malfunctioning voltmeter.
NOTE: Because the current from the battery will soon drop
after the engine is started, the next step should be
carried out as quickly as possible in order to obtain the
maximum current output value.

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

11. Immediately after setting the headlights to high beam and turning the heater
blower switch to the highest position, increase the engine speed to 2,500 RPM
and read the maximum current output value displayed on the ammeter. Limit
value: 70 percent of nominal current output.
12. The reading on the ammeter should be above the limit value. If the reading is
below the limit value and the generator output wire is normal, remove the
generator from the engine and check the generator.
13. Run the engine at idle speed after the test.
14. Turn the ignition switch to the LOCK (OFF) position.
15. Disconnect the engine tachometer or scan tool MB991958.
16. Disconnect the negative battery cable.
17. Disconnect the ammeter and voltmeter.
18. Connect the negative battery cable.
19. Run the engine for 10 minutes at an idle. REGULATED VOLTAGE TEST Required special tools:
MB991958: Scan Tool MUT
-III Sub Assembly.
NOTE: The current output value will depend on the electrical
load and the temperature of the generator body.
NOTE: If the electrical load is small while testing, the specified
level of current may not be output even though the
generator is normal. In such cases, increase the
electrical load by leaving the headlights turned on for
some time to discharge the battery or by using the
lighting system in another vehicle, and then test again.
NOTE: The specified level of current also may not be output if
the temperature of the generator body or the ambient
temperature is too high. In such cases, cool the
generator and then test again.

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

Generator installation. Check to be sure that the battery installed in the vehicle is fully charged. Generator drive belt tension. Fusible link. Abnormal noise from the generator while the engine is running.
2. Turn the ignition switch to the LOCK (OFF) position.
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 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. Connect a clamp-type DC test ammeter with a range of 0-150A to the
generator B terminal output wire.
6. Reconnect the negative battery cable.
7. Connect an engine tachometer, or scan tool MB991958.
8. Turn the ignition switch to the ON position and check that the reading on the
voltmeter is equal to the battery positive voltage.
9. Check to be sure that all lights and accessories are off.
10. Start the engine.
11. Increase the engine speed to 2,500 RPM
12. Read the value displayed on the voltmeter when the current output by the
generator becomes 10A or less.
13. If the voltage reading conforms to the value in the voltage regulation table,
then the voltage regulator is operating normally. If the voltage is outside the
standard value, there is a malfunction of the volta
ge re
gulator or the
generator.
NOTE: If the voltage is 0V, the cause is probably an open
circuit in the wire or fusible link between the generator
S terminal and the battery positive terminal or
malfunctioning voltmeter.

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