Mitsubishi Montero (2004+). Manual — part 387
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-3
CHARGING SYSTEM DIAGNOSIS
M1161000700234
TROUBLESHOOTING HINTS
Generator malfunction light dose not go on when the ignition
switch is turned to ON, before the engine starts.
• Check the bulb.
Generator malfunction light dose not switch off after the engine
starts.
• Check the IC voltage regulator inside the generator.
Discharged or overcharged battery.
• Check the IC voltage regulator inside the generator.
The generator malfunction light illuminates dimly.
• Check the diode (inside the combination meter) for a
short-circuit.
TROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the fol-
lowing steps.
STEP 1.
Q: Is the battery in good condition? (Refer to GROUP 54A,
Chassis Electrical
− Battery − On-vehicle Service −
Battery Check
YES : Go to Step 2 .
NO : Charge or replace the battery.
STEP 2.
Q: Is the generator drive belt in good condition? (Refer to
GROUP 00, General <Body and Chasis>
− Maintenance
Service
− 8. Drive Belt (For Generator, Water Pump and
Power Steering Pump) (Check Condition)
YES : Go to Step 3 .
NO : Adjust the belt tension or replace the belt.
STEP 3.
Q: Does the generator malfunction light come on when the
ignition switch is turned on?
YES : Go to Step 4 .
NO :
• Check the ignition switch. (Refer to GROUP 54A,
Chassis Electrical
− Ignition Switch − Ignition
Switch
− Inspection
.)
• Check for burnt-out generator malfunction light.
• Check the generator. (Refer to Charging System −
Generator Assembly
− Inspection
• Check the generator malfunction light-related
circuits.
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-4
STEP 4.
Q: Does the generator malfunction light go out after
starting the engine?
YES : Go to Step 5 .
NO : Check the generator (Refer to Charging System
−
Generator Assembly
− Inspection
STEP 5.
Q: Is an oscilloscope available?
YES : Go to Step 6 .
NO : Go to Step 7.
STEP 6.
Q: Dose the oscilloscope show a normal wave pattern?
(Refer to Charging System
− On-vehicle Service − Wave
Pattern Check Using an Oscilloscope
.)
YES : Go to Step 7.
NO : Check the generator. (Refer to Charging System
−
Generator Assembly
− Inspection
STEP 7.
• Engine: 2,500 r/min
• Headlight: ON (high beam)
• Voltage between generator terminal B and the positive bat-
tery terminal
OK: 0.5 V or less
• Voltage between the negative battery terminal and genera-
tor body
OK: 0.5 V or less
Q: Are the generator output line and ground line in good
condition?
YES : Go to Step 8 .
NO : Check the generator output line and ground line.
STEP 8.
Q: Is the output current normal? (Refer to Charging
System
− On-vehicle Service − Output Current Test
.)
YES : Go to Step 9 .
NO : Check the generator (Refer to Charging System
−
Generator Assembly
− Inspection
STEP 9.
Q: Is the regulated voltage normal? (Refer to Charging
System
− On-vehicle Service − Regulated Voltage Test
.)
YES : Go to Step 10 .
NO : Check the generator (Refer to Charging System
−
Generator Assembly
− Inspection
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-5
STEP 10.
Q: Is the voltage drop in the generator output line normal?
YES : Generator is normal. Check other systems.
NO : Check the output line.
SPECIAL TOOL
M1161000600334
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991958
Scan tool (MUT-III sub
assembly)
A: MB991824
Vehicle
communication
interface (V.C.I.)
B: MB991827
MUT-III USB cable
C: MB991910
MUT-III main harness
A (Vehicles with CAN
communication
system)
D: MB991911
MUT-III main harness
B (Vehicles without
CAN communication
system)
E: MB991914
MUT-III main harness
C (for Daimler Chrysler
models only)
F: MB991825
MUT-III measurement
adapter
G: MB991826
MUT-III trigger
harness
MB991824-KIT
NOTE: G: MB991826
MUT-III Trigger Harness
is not necessary when
pushing V.C.I. ENTER
key.
Checking of engine idle
speed
MB991910
MB991826
MB991958
MB991911
MB991914
MB991824
MB991827
MB991825
DO NOT USE
A
B
C
D
E
F
G
DO NOT USE
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-6
ON-VEHICLE SERVICE
GENERATOR OUTPUT LINE VOLTAGE DROP TEST
M1161000900335
Required Special Tool:
MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
This test determines whether the wiring from the
generator "B" terminal to the positive battery terminal
(including the fusible link) is in good condition or not:
WARNING
Battery posts, terminals and related acces-
sories contain lead and lead compounds.
WASH HANDS AFTER HANDLING.
1. Always be sure to check the following before the
test.
• Generator installation
• Generator drive belt tension (Refer to GROUP
00, General <Body and Chasis>
− Maintenance
Service
− 8. Drive Belt (For Generator and Water
Pump, Power Steering Pump) (Check Condition)
• 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. Disconnect the generator output wire from the
generator "B" terminal and 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 lead of the
ammeter to the "B" terminal, and then connect the
negative lead of the ammeter to the disconnected
output wire.)
MB991519
Generator harness
connector
MIT530
Micrd 530 charging
system tester.
Checking of generator
("S" terminal voltage)
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
AKX00185
GENERATOR
AMMETER
VOLTMETER
(DIGITAL-TYPE)
BATTERY
+
–
"B"TERMINAL
AB
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