check engine MITSUBISHI 380 2005 Repair Manual
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Page 939 of 1500
ENGINE COOLING DIAGNOSIS
ENGINE COOLING14-24
STEP 6. Check the fan controller.
(1) Disconnect fan controller connector A-24.
(2) Back out connector terminal pin 2 from connector housing.
(3) Reconnect the connector with connector terminal pin 2 still
removed.
(4) Turn the ignition switch to the "ON" position.
(5) Check for the cooling fan operation.
The cooling fan rotates. (with connector terminal pin 2
disconnected)
(6) Check for the cooling fan operation.
Using a suitable probe connect the fan controller termi-
nal 2 at controller side to earth.The cooling fan stops.
(When pin 2 of fan controller is connected to earth)
(7) Turn the ignition switch to the "OFF" position.
(8) Disconnect fan controller connector A-24, and re-locate
connector terminal pin 2 into connector housing.
(9) Reconnect the connector with connector terminal pin 2
installed correctly.
Q: Does the cooling fan rotate? And when the fan
controller pin 2 is connected to the body earth, does
the cooling fan stop?
YES : Go to Step 7.
NO : Replace the fan motor and fan controller (Refer to
14-25). Then go to Step 8.
Page 940 of 1500
ENGINE COOLING DIAGNOSIS
ENGINE COOLING14-25
STEP 7. MUT-III self-diag code
Check if an MPI system self-diag code is set. (Refer to GROUP
13A - Trouble shooting 13A-5)
Q: Diagnosis code set?
YES : Inspection chart for diagnosis code (Refer to GROUP
13A - Trouble shooting 13A-5)
NO : Replace the engine-ECU (Refer to GROUP 13A,
Engine-ECU 13A-675 ) Then go to Step 8 .
STEP 8. Check the symptoms.
Q: Does the radiator fan motor and the condenser fan
motor operate correctly?
YES : This symptom is complete.
NO : Return to Step 1.
INSPECTION PROCEDURE 5: Radiator Fan does not Operate
.
Radiator Fan and Condenser Fan Drive
Circuit
.
TECHNICAL DESCRIPTION
The cause could be a malfunction of the radiator fan
motor or an open circuit between the fan controller
and the radiator fan motor.
.
TROUBLESHOOTING HINTS
Malfunction of radiator fan motor
Malfunction of fan controller
Refer to component locations GROUP-1
Refer to configuration diagrams GROUP-1
Refer to circuit diagrams GROUP-1
DIAGNOSIS
Replace the radiator fan motor and fan controller assembly.
Q: Does the radiator fan operate correctly?
YES : There is no action to be taken?
NO : Repair the wiring harness between the fan controller
and the radiator fan motor.
INSPECTION PROCEDURE 6: Condenser Fan does not Operate
.
Radiator Fan and Condenser Fan Drive
Circuit
.
TECHNICAL DESCRIPTION
The cause could be a malfunction of the condenser
fan motor or fan controller.
.
TROUBLESHOOTING HINTS
Malfunction of condenser fan motor
Malfunction of fan controller
Refer to component locations GROUP-1
Refer to configuration diagrams GROUP-1
Refer to circuit diagrams GROUP-1
Page 941 of 1500
ON-VEHICLE SERVICE
ENGINE COOLING14-26
DIAGNOSIS
STEP 1. Check the condenser fan motor.
Condenser fan motor check. (Refer to GROUP 55, Condenser
and Condenser Fan Motor.
Q: Is the condenser fan motor in good condition?
YES : Go to Step 2.
NO : Replace the condenser fan motor, then go to Step 3.
STEP 2. Check the fan controller.
Refer to 29.
Q: Is the fan controller in good condition?
YES : Go to Step 3.
NO : Replace the fan motor and fan controller (Refer to
14-25). Then go to Step 3.
STEP 3. Check the symptoms.
Q: Do the condenser fan operate?
YES : This symptom is complete.
NO : Return to Step 1.
ON-VEHICLE SERVICE
ENGINE COOLANT LEAK CHECKM1141001000333
When pressure testing the cooling system, slowly
release cooling system pressure to avoid getting
burned by hot coolant.
Be sure to completely clean away any moisture from
the places checked.
When the tester is taken out, be careful not to spill any
coolant.
Be careful when installing and removing the tester and
when testing not to deform the filler neck of the radia-
tor.
1. Check that the coolant level is up to the filler neck. Install a
radiator tester and apply 160 kPa (23 psi) pressure, and
then check for leakage from the radiator hose or
connections.
2. If there is leakage, repair or replace the appropriate part.
Page 942 of 1500
ON-VEHICLE SERVICE
ENGINE COOLING14-27
RADIATOR CAP PRESSURE CHECKM1141001300419
NOTE: Be sure that the cap is clean before testing. Rust or
other foreign material on the cap seal will cause an improper
reading.
1. Use a cap adapter to attach the cap to the tester.
2. Increase the pressure until the indicator of the gauge stops
moving.
Minimum limit: 83 kPa (12 psi)
Standard value: 93
123 kPa (14 18 psi)
3. Replace the radiator cap if the reading does not remain at or
above the limit.
ENGINE COOLANT REPLACEMENTM1141001200478
When removing the radiator cap, use care to avoid
contact with hot coolant or steam. Place a shop towel
over the cap and turn the cap counterclockwise a lit-
tle to let the pressure escape through the vinyl tube.
After relieving the steam pressure, remove the cap by
slowly turning it counterclockwise.
1. Drain the water from the radiator, heater core and engine
after unplugging the radiator drain plug and removing the
radiator cap.
Page 944 of 1500
ON-VEHICLE SERVICE
ENGINE COOLING14-29
Do not use alcohol or methanol anti-freeze or any
engine coolants mixed with alcohol or methanol
anti-freeze. The use of an improper anti-freeze can
cause corrosion of the aluminum components.
8. By referring to the section on coolant, select an appropriate
concentration for safe operating temperature within the
range of 30 to 60 %. Use special tool MB991871 to refill the
coolant. A convenient mixture is a 50 % water and 50 %
antifreeze solution [freezing point:
31C (32.8 F)].
Recommended antifreeze: Long Life Antifreeze
Coolant or an equivalent
Quantity:
8.7 Litres
NOTE: For how to use special tool MB991871, refer to its
manufacturer’s instructions.
9. Reinstall the radiator cap.
10.Start the engine and let it warm up until the thermostat
opens.
11.After repeatedly revving the engine up to 3,000 r/min several
times, stop the engine.
12.Remove the radiator cap after the engine has cooled, and
pour in coolant up to the brim. Reinstall the cap.
Do not overfill the radiator condenser tank assembly.
13.Add coolant to the radiator condenser tank assembly
between the "FULL" and "LOW" mark if necessary.
ENGINE COOLANT CONCENTRATION TESTM1141001100396
Refer to GROUP 00, RECOMMENDED LUBRICANTS AND
LUBRICANT CAPACITIES TABLE 35.
FAN CONTROLLER CHECKM1141007400113
1. Remove the fan controller connector.
2. Turn the ignition switch to the "ON" position, and measure
the voltage between the harness-side connector terminals.
Standard value: System voltage
Page 946 of 1500
ON-VEHICLE SERVICE
ENGINE COOLING14-31
FAN CONTROL RELAY CONTINUITY CHECKM1141006200310
BATTERY
VOLTAGETERMINAL NO. TO
BE CONNECTED
TO TESTERCONTINUITY TEST
RESULTS
Not applied 4
2 Open circuit
Connect
terminal No.3
and battery (
)
terminal.
Connect
terminal No.1
and battery (+)
terminal.4
2 Less than 2 ohms
Page 947 of 1500
RADIATOR
ENGINE COOLING14-32
RADIATOR
REMOVAL AND INSTALLATIONM1141001500521
Pre-removal Operation
Engine Coolant Draining (Refer to 27).
Air Cleaner Removal (Refer to GROUP 15, Air Cleaner 4).Post-installation Operation
Air Cleaner Installation (Refer to GROUP 15 4).
Engine Coolant Refilling and Level Check (Refer to 27).
A/T Fluid Refilling and Level Check (Refer to GROUP 00,
Maintenance Service 45).
RADIATOR REMOVAL STEPS
1. RADIATOR CONDENSER TANK
HOSE
<> >>A<<2. RADIATOR UPPER HOSE
<> >>A<<3. RADIATOR LOWER HOSE
<>4. A/T OIL COOLER HOSE
CONNECTION
5. CONDENSER FAN MOTOR
CONNECTOR
6. FAN CONTROLLER CONNECTOR
HOOD LATCH (REFER TO
GROUP 42, HOOD 8).
7. FRONT END STRUCTURE BAR
8. UPPER INSULATOR
9. CONDENSER BOLTS
10. RADIATOR ASSEMBLY
11. LOWER INSULATOR12. RADIATOR CONDENSER TANK
ASSEMBLY
<>13. A/T OIL COOLER HOSE
14. CONDENSER FAN SHROUD
ASSEMBLY
15. COOLING FAN SHROUD
ASSEMBLY
16. RADIATOR
FAN MOTOR REMOVAL STEPS
1. RADIATOR CONDENSER TANK
HOSE
5. CONDENSER FAN MOTOR
CONNECTOR
<> >>A<<3. RADIATOR UPPER HOSE
6. FAN MOTOR CONNECTOR
12. RADIATOR CONDENSER TANK
ASSEMBLY RADIATOR REMOVAL STEPS
Page 953 of 1500
THERMOSTAT
ENGINE COOLING14-38
INSPECTIONM1141002500450.
Thermostat Check
1. Immerse the thermostat in water, and heat the water while
stirring. Check the thermostat valve opening temperature.
Standard value:
Valve opening temperature:
88
1.5C (190 3F)
2. Check that the amount of valve lift is at the standard value
when the water is at the full-opening temperature.
NOTE: Measure the valve height when the thermostat is
fully closed, and use this measurement to compare the
valve height when the thermostat is fully open.
Standard value:
Full-opening temperature:
100
C (212F)
Amount of valve lift:
9.0 mm (0.35 inch) or more
Page 956 of 1500
WATER HOSE AND WATER PIPE
ENGINE COOLING14-41
INSTALLATION SERVICE POINTS
.
>>A<< O-RING INSTALLATION
Do not allow engine oil or other grease to adhere to the
O-ring
Insert the O-ring to the water pipe, and coat the outer portion of
the O-ring with water or engine coolant.
.
>>B<< ENGINE COOLANT TEMPERATURE
SENSOR INSTALLATION
Apply the specified sealant to the thread of the engine coolant
temperature sensor, and then tighten it to the specified torque.
Specified Sealant: 3M
AAD Part No. 8731 or equiva-
lent
.
>>C<< RADIATOR UPPER HOSE CONNECTION
1. Insert each hose as far as the projection of the water outlet
fitting.
2. Align the mating marks on the radiator hose and hose
clamp, and then connect the radiator hose.
INSPECTIONM1141003400337.
Water Pipe and Hose Check
Check the water pipe and hose for cracks, damage and clogs.
Replace them if necessary.
Page 961 of 1500
GENERAL DESCRIPTION
INTAKE AND EXHAUST15-2
GENERAL DESCRIPTIONM1151000100446
The exhaust pipe is divided into four parts.
INTAKE AND EXHAUST DIAGNOSIS
INTRODUCTIONM1151006900321
Intake leaks usually create driveability issues that
are not obviously related to the intake system.
Exhaust leaks or abnormal noise is caused by
cracks, gaskets and fittings, or by exhaust pipe or
muffler damage due to impacts during travel. The
exhaust leaks from these sections and causes the
exhaust noise to increase. There may be cases
when the system contacts the body and vibration
noise is generated.
TROUBLESHOOTING STRATEGYM1151007000321
Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find an
intake or exhaust system fault.
1. Gather information from the customer.2. Verify that the condition described by the
customer exists.
3. Find the malfunction by following the Symptom
Chart.
4. Verify malfunction is eliminated.
SYMPTOM CHARTM1151007100328
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Exhaust Leakage
DIAGNOSIS
STEP 1. Start the engine. Have an assistant stay
in the driver’s seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.
Q: Is the exhaust leaking?
YES :
Go to Step 2.
NO : The procedure is complete.
STEP 2. Check the gasket for cracks, damage.
Q: Is the gasket damaged?
YES :
Replace the gasket, then go Step 1.
NO : Go to Step 3.
STEP 3. Check for loose coupling sections.
Q: Are there any loose each sections?
YES :
Tighten, then go to Step 1.
NO : There is no action to be taken. SYMPTOM INSPECTION PROCEDURE REFERENCE PAGE
Exhaust Leakage 1
P.15-2
Abnormal Noise 2
P.15-3