Mitsubishi Lancer Evolution IX. Manual — part 455
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-295
STEP 11. Perform voltage measurement at C-121
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal No. 8 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Check and repair harness between B-14
(terminal No. 10) intermediate connector
and C-121 (terminal No. 8) engine-ECU
connector.
• Check output line for short circuit.
STEP 12. Perform voltage measurement at C-121
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Engine: Idling after warm-up
• Transmission: Neutral
• Radiator fan: Inactive
• Voltage between terminal No. 8 and earth.
OK: Switching the head lamps to ON from
OFF causes the voltage to increase by 0.2
−
3.5 V.
Q: Is the check result normal?
YES :
Go to Step 13 .
NO :
Replace the alternator.
STEP 13. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
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AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK401753
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Connector : B-14
Male side
connector
B-14(B)
AB
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Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-296
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 fan controller
• Failed engine coolant temperature sensor
• Failed thermostat
• Failed water pump
• Failed radiator core
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-II/III diagnosis code
Q: 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 −
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace or add engine coolant.
STEP 3. M.U.T.-II/III actuator test
• Item No. 21: Fan controller
OK: Fan motor rotating
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check radiator fan control relay system
(Refer to Inspection Procedure 25
).
STEP 4. M.U.T.-II/III data list
• Item No. 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 the thermostat.
STEP 6. Check water pump.
• Check water pump.
Q: Is the check result normal?
YES :
Replace the radiator.
NO :
Replace the water pump.
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-297
Inspection Procedure 21: Abnormal Rotation of Fan Motor
OPERATION
• The control (duty) signal is inputted to the fan
controller (terminal No. 2) from the engine-ECU
(terminal No. 18).
FUNCTION
• The engine-ECU inputs a duty signal suitable for
the engine coolant temperature, vehicle speed
and A/C switch position to the fan controller. In
response to the signal, the fan controller controls
the rotating speeds of the radiator fan and A/C
condenser fan. (The fan speed becomes higher
as the average voltage of the terminal comes
nearer to 5 V.)
PROBABLE CAUSES
• Failed fan controller
• Open/short circuit in fan controller circuit or loose
connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE:
.
*1: L.H. drive vehicles
*2: R.H. drive vehicles
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10
5 V
Fan controller circuit
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet PU: Purple
AB
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
Fan controller
(MU802322)
A-17
2
A-13 (*1)
2
L
14
C-31 (*2)
18
Engine-ECU
(MU803784)
C-121
L
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-298
STEP 1. Connector check: C-121 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Check at C-121 engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Short-circuit terminal No. 18 to earth.
OK: Fan motor stops rotating.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Go to Step 4 .
STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
).
AK501995
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AB
Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
AK501995
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Connector: C-121
C-121 (GR)
C-121 (GR)
Harness side connector
<L. H. drive vehicles>
<R. H. drive vehicles>
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