Mitsubishi Colt Ralliart. Manual — part 736
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-269
STEP 3. Perform voltage measurement at A-131
alternator connector.
•
Disconnect connector and measure at harness side.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 4 .
STEP 4. Connector check: B-141 ignition switch
connector
Q: Is the check result normal?
YES :
Check intermediate connectors A-17, B-41,
B-14, B-22, B-131, B-129, and repair if
necessary. If intermediate connectors are
normal, check and repair harness between
B-141 (terminal No. 2) ignition switch
connector and A-131 (terminal No. 3)
alternator connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
STEP 5. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace.
2
1
3
4
AK402098
A-131(G)
Connector: A-131
Harness side
connector
AC
1
2
3
4
5
6
AK402103
Connector: B-141
Harness side
connector
B-141
AC
2
1
3
4
AK402098
A-131(G)
Connector: A-131
Harness side
connector
AC
AK402745
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2
5
3
1
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L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-270
STEP 6. Perform voltage measurement at A-114
engine-ECU connector.
•
Disconnect connector and measure at harness side.
• Ignition switch: ON
• Voltage between terminal No. 64 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 7 .
STEP 7. Check harness between A-131 (terminal
No. 1) alternator connector and A-114 (terminal
No. 64) engine-ECU connector.
•
Check output line for open/short circuit.
Q: Is the check result normal?
YES :
Replace alternator.
NO :
Repair.
AK402745
6
4
2
5
3
1
9
7
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64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
2
1
3
4
AK402098
A-131(G)
Connector: A-131
Harness side
connector
AC
AK402745
6
4
2
5
3
1
9
7
8
10
11
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52
53
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58
59
60
61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-271
STEP 8. Perform voltage measurement at A-114
engine-ECU connector.
•
Disconnect engine-ECU connector, and connect
Special Tool Power Plant ECU Check Harness
(MB991987), and measure the voltage on the
check connector.
• Engine: Idling after warm-up
• Transmission: Neutral
• Cooling fan: Inactive
• Voltage between terminal No. 64 and earth.
OK: Switching the headlamps to ON from
OFF causes the voltage to increase 0.2
− 3.5
V.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Check alternator.
STEP 9. Check the trouble symptom.
Q: Does trouble symptom recur?
YES :
Replace engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
AK402745
6
4
2
5
3
1
9
7
8
10
11
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60
61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-272
Inspection Procedure 18: Overheating
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by failed engine cool-
ing system, failed engine coolant temperature
sensor, or other faults.
PROBABLE CAUSES
• Lack of or deteriorated engine coolant
• Failed fan control relay
• Failed engine coolant temperature sensor
• Failed thermostat
• Failed water pump
• Failed radiator core
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code output?
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 (HI)
b. Item 21: Cooling fan motor (LO)
Q: Are the check result normal?
YES :
Go to Step 4.
NO :
Check fan control relay system (Refer to
Inspection Procedure 23
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
(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.
Main
Index
Group
TOC
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