Mitsubishi Colt Ralliart. Manual — part 737
![](/vehicles/winoney/ama/flend/katheres.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-273
Inspection Procedure 19: Abnormal Rotation of Fan Motor
OPERATION
• The battery voltage is applied to the cooling fan
control relay (LO) coil (terminal No. 1) and cool-
ing fan control relay (HI) coil (terminal No. 1) from
the ignition switch.
• The engine-ECU (terminal No. 95 and No. 96)
turns on the switch of the power transistor on the
unit, and then turns on the switch of the relay by
applying the electrical current to the cooling fan
control relay (LO) coil or cooling fan control relay
(HI) coil.
AK402838
M
3
1
2
4
3
1
2
4
1 2
3 4
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
B-114
B-127
B-114
B-127
B-114
B-127
6
14
Cooling fan
control
relay (LO)
Cooling
fan
motor
J/C
B-114
Cooling fan
control
relay (HI)
Engine-ECU
B-127
B-109
B-110
L-R
R-W
R-L
B-112
B-108
3
1
4
2
1
1
R
Fusible link
3
40A
L
B
B
J/B
2
17
95
96
B-109
B-130
1
3
4
2
3
L-R
Ignition switch (IG2)
41
7.5A
1
3
4
2
5
2
A-08
A-20
A-31
AC
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
P: Purple
Cooling Fan Control Relay Circuit
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/baw.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-274
• When the cooling fan control relay (LO) is in ON
position, the battery voltage is applied to the cool-
ing fan motor (terminal No. 1) from the cooling
fan control relay (LO) (terminal No. 4).
• When the cooling fan control relay (LO) and cool-
ing fan control relay (HI) are in ON position, the
battery voltage is applied to the cooling fan motor
(terminal No. 3) from the cooling fan control relay
(HI) (terminal No. 4).
FUNCTION
• When the cooling fan control relay (LO) is in ON
position, the fan motor rotates with the low speed.
• When the cooling fan control relay (LO) and the
cooling fan control relay (HI) are in ON position,
the fan motor rotates with the high speed.
PROBABLE CAUSES
• Failed cooling fan motor
• Open/short circuit in or damage to the cooling fan
control relay circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check cooling fan motor.
• Check cooling fan motor (Refer to GROUP 14 −
On-vehicle Service
− Cooling Fan Motor Inspec-
).
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Replace cooling fan motor.
STEP 2. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace.
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/venel.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-275
STEP 3. Perform voltage measurement at A-08
engine-ECU connector.
•
Disconnect connector and measure at harness side.
• Ignition switch: ON
• Voltage between terminal No. 95 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-114 cooling fan
control relay (LO) connector
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
AK402106
3
2
1
4
AC
Connector: B-114
J/B side
connector
B-114
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/ayo.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-276
Q: Is the check result normal?
YES :
Check intermediate connector B-110, and
repair if necessary. If the intermediate
connector is normal, check and repair
harness between B-114 (terminal No. 2)
cooling fan control relay (LO) connector and
A-08 (terminal No. 95) engine-ECU
connector.
• Check signal line for short circuit.
NO :
Repair or replace.
STEP 5. Perform voltage measurement at A-08
engine-ECU connector.
•
Disconnect connector and measure at harness side.
• Ignition switch: ON
• Voltage between terminal No. 96 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Go to Step 6 .
STEP 6. Connector check: B-127 cooling fan
control relay (HI) connector
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
3
2
1
4
AK402107
J/B side
connector
Connector: B-127
J/B (front side)
AC
B-127
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
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