Mitsubishi Colt Ralliart. Manual - part 80
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-274
Inspection Procedure 20: Overheating
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by failed engine cool-
ing system, failed fan controller, failed engine
coolant temperature sensor or other faults.
PROBABLE CAUSES
• Insufficient or deteriorated engine coolant
• Failed cooling fan control relay
• Failed engine coolant temperature sensor
• Failed thermostat
• Failed water pump
• Failed radiator core
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES :
Inspection chart for diagnosis code (Refer
to
NO :
Go to Step 2 .
STEP 2. Check engine coolant.
NOTE: If engine coolant level falls too early, check
for leaky spots, and repair if necessary.
• Check engine coolant (Refer to GROUP 14 −
On-vehicle Service
− Engine Coolant Leak Check
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace or add engine coolant.
STEP 3. M.U.T.-III actuator test
• Refer to Actuator Test Reference Table
.
a. Item 20: Cooling fan motor
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check fan control relay system (Refer to
Inspection Procedure 25
STEP 4. M.U.T.-III data list
• Item 21: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80
− 120°C
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Check engine coolant temperature sensor
system (Refer to Code No. P0115
).
STEP 5. Check thermostat.
• Check thermostat (Refer to GROUP 14 − Ther-
mostat
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Replace thermostat.
STEP 6. Check water pump.
• Check water pump.
Q: Is the check result normal?
YES :
Replace radiator.
NO :
Replace water pump.
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