Mitsubishi 380. Manual — part 234
ENGINE COOLING DIAGNOSIS
ENGINE COOLING
14-20
STEP 23. MUT-III self-diag code
Check if an MPI system self-diag code is set. (Refer to GROUP
13A - Trouble shooting
).
Q: Diagnosis code set?
YES : Inspection chart for diagnosis code (Refer to GROUP
13A - Trouble shooting
)
NO : Replace the engine-ECU (Refer to GROUP 13A,
Engine-ECU
STEP 24. 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 4: Radiator Fan and Condenser Fan do not Change Speed or Stop
.
Radiator Fan and Condenser Fan Drive
Circuit
Refer to 5.
.
TECHNICAL DESCRIPTION
• The cause could be a malfunction of the fan con-
troller power supply or earth circuit.
• If the communication line wiring harness between
the fan controller and the engine-ECU is
short-circuited to earth, the radiator fan motor
and the condenser fan motor will not rotate.
• The cause could also be a malfunction of input
signal from the A/C switch, the water temperature
sensor unit and the vehicle speed sensor <M/T>
or the output shaft speed sensor <A/T> to the
engine-ECU.
• The cause could also be a malfunction of the fan
controller or the engine-ECU.
.
TROUBLESHOOTING HINTS
• Malfunction of fusible link No.2
• Malfunction of fan control relay
• Malfunction of cooling fan motor
• Malfunction of fan controller
• Malfunction of engine-ECU
• Damaged wiring harness or connector
DIAGNOSIS
STEP 1. Check the fan control relay.
Refer to
Q: Is the fan control relay in good condition?
YES : Go to Step 2.
NO : Replace the fan control relay. Then go to Step 8.
ENGINE COOLING DIAGNOSIS
ENGINE COOLING
14-21
STEP 2. Check the fan control relay connector A-10X.
Q: Is the connector in good condition?
YES : Go to Step 3.
NO : Repair the connector or replace the relay box. Then
go to Step 8.
STEP 3. Check the harness wire between fan control relay
connector A-10X terminal 2 and fan controller connector
A-24 terminal 3.
Q: Is the harness wire in good condition?
YES : Go to Step 4.
NO : Repair the damaged harness wire. Then go to Step 8.
04DB012A
Fusible link
No.2
Relay box
Fan control
relay
A-10X
4
04DB012A
Fusible link
No.2
Relay box
Fan control
relay
A-10X
4
04DB008A
1
2
3
A-24
Connector: A-24
ENGINE COOLING DIAGNOSIS
ENGINE COOLING
14-22
STEP 4. Check the fan controller connector A-24,
intermediate connector A-13 and engine-ECU connector
B-21.
Q: Are these connectors in good condition?
YES : Go to Step 5.
NO : Repair or replace the connector. Then go to Step 8.
04DB008A
1
2
3
A-24
Connector: A-24
AK303148
CONNECTOR: A-13
AB
A-13(GR)
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
ENGINE COOLING DIAGNOSIS
ENGINE COOLING
14-23
STEP 5. Check the harness wire between fan controller
connector A-24 terminal 2 and engine-ECU connector
B-21 terminal 71.
Q: Are these harness wires in good condition?
YES : Go to Step 6.
NO : Repair the damaged harness wire. Then go to Step 8.
04DB008A
1
2
3
A-24
Connector: A-24
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
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