Mitsubishi Colt Ralliart. Manual — part 81
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-278
STEP 7. Connector check: A-31 earth connector
Q: Is the check result normal?
YES :
Check and repair harness between A-20
(terminal No. 2) cooling fan motor connector
and A-31 (terminal No. 2) earth connector.
• Check earthing line for damage.
NO :
Repair or replace the connector.
STEP 8. Connector check: B-114 cooling fan
control relay connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace the connector.
STEP 9. Check harness between B-114 (terminal
No. 4) cooling fan control relay connector and
A-20 (terminal No. 1) cooling fan motor
connector.
NOTE: Before checking harness, check intermediate
connector B-109, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair the damaged harness wire.
AK402208
3
2 1
6
5 4
Connector: A-31
A-31 (G)
AC
A-31 Harness side
connector
AK402058
3
2
1
4
AC
B-114
J/B side
connector
Connector: B-114
J/B (front side)
B-114
AK402058
3
2
1
4
AC
B-114
J/B side
connector
Connector: B-114
J/B (front side)
B-114
AK402059
2 1
4 3
AC
A-20 Harness
side connector
A-20
Connector: A-20
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-279
STEP 10. Check harness between battery and
B-114 (terminal No. 3) cooling fan control relay
connector.
NOTE: Before checking harness, check intermediate
connector B-108, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair the damaged harness wire.
STEP 11. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
AK402058
3
2
1
4
AC
B-114
J/B side
connector
Connector: B-114
J/B (front side)
B-114
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-280
Inspection Procedure 22: Poor A/C performance
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by short /overcharged
A/C refrigerant, failed A/C control system, failed
fan control system or other faults.
PROBABLE CAUSES
• Short or overcharged A/C refrigerant
• Failed A/C compressor relay
• Failed cooling fan control relay
• Failed A/C-ECU
• 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. A/C compressor magnet clutch
operation check.
• Engine: Idling
• A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is 25
°C
or less
OK:
Magnet clutch active (when A/C is ON)
Magnet clutch inactive (when A/C is OFF)
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Go to Step 3 .
STEP 3. M.U.T.-III data list
• Item 49: A/C relay
a. Engine: Idling
b. A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is
25
°C or less
OK:
ON (when A/C is ON)
OFF (when A/C is OFF)
Q: Is the check result normal?
YES :
Check A/C system (Refer to GROUP 55A
−
Check Chart For Diagnosis Code
NO :
Check A/C compressor relay (Refer to
Inspection Procedure 26
STEP 4. M.U.T.-III actuator test
• Refer to Actuator Test Reference Table
.
a. Item 20: Cooling fan motor
Q: Are the check results normal?
YES :
Check charged amount of A/C refrigerant
(Refer to GROUP 55
− On-vehicle Service −
Check The Refrigerant Level
NO :
Check fan control relay system (Refer to
Inspection Procedure 25
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-281
Inspection Procedure 23: Engine-ECU <M/T> or engine-CVT-ECU <CVT> power supply, engine control
relay, ignition switch-IG1 system
AK402702
R
92 93 94 95969798
77 78 79 808182838485868788899091
99
100
107 108 109 110 111112113114115116117118119120121
122 123 124 125126127128129130131132133134135136
101102103104105106
71 72
73 74
75 76
3
1
2
4
1 2 3
4 5 6
B-141
B-106
A-08
R
IG2
ST
LOCK
ACC
IG1
16
1
20A
38
7.5A
Fusible link
Ignition switch
3
2
J/B
122
75
2
76
B
B
3
B-110
B-112
B-112
B-112
B-108
B-129
82
Engine
control
relay
3
1
1
4
2
107
Battery
backup
92
19
23
6
77
Power
source
9
R
R-B
B-O
L-B
G
R
R
Power Supply And Ignition Switch-IG Circuit
10
10A
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
A-31
J/C
A-30
J/C
AC
GND
GND
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
Main
Index
Group
TOC
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