Mitsubishi Colt Ralliart. Manual — part 748
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-317
Inspection Procedure 24: A/C Compressor Relay System
OPERATION
• The battery voltage is applied to the A/C com-
pressor relay (terminal No. 1 and No. 3).
• The engine-ECU (terminal No. 110) makes the
power transistor in the unit be in ON position and
makes currents go on the A/C compressor relay
coil, and that makes the relay be in ON position.
• When the A/C compressor relay is switched ON,
the battery voltage is supplied from the A/C com-
pressor relay (terminal No. 4) to the A/C com-
pressor (terminal No. 1).
1
AK402705
3
1
2
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
24
6
10A
L
B-R
B-R
Fusible link
B-108
J/B
A/C
compressor
relay
B-104
1
A-130
MU802653
A/C refrigerant
temperature
switch
A/C compressor assembly
Magnetic
clutch
A/C Compressor Relay Circuit
110
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
AF
A-08
Engine-ECU
2
B-112
4
A-17
8
B-110
G
6
1
3
4
2
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-318
FUNCTION
• When the A/C switch ON signal is input to the
engine-ECU, the engine-ECU places the A/C
compressor relay in the ON position. Accordingly,
the battery voltage supplied to the A/C compres-
sor operates the magnet clutch.
PROBABLE CAUSES
• Failed A/C compressor relay
• Failed A/C compressor
• Open/short circuit in or damage to the A/C com-
pressor relay circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-104 A/C compressor
relay connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Check A/C compressor relay.
• Check A/C compressor relay (Refer to GROUP
55A
− On-vehicle Service − Power Relay Check
).
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace A/C compressor relay.
STEP 3. Perform voltage measurement at B-104
A/C compressor relay.
•
Disconnect connector and measure at harness side.
• Voltage between terminal No. 1, No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Check intermediate connector B-108, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between battery and B-104
(terminal No. 1 and No. 3) A/C compressor
relay connector.
• Check power supply line for
open/short circuit.
3
2
1
4
AK402116
J/B side
connector
Connector: B-104
J/B (front side)
B-104
AC
3
2
1
4
AK402116
J/B side
connector
Connector: B-104
J/B (front side)
B-104
AC
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-319
STEP 4. Check harness between battery and
B-104 (terminal No. 1 and No. 3) A/C compressor
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 5 .
NO :
Repair.
STEP 5. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Repair or replace.
3
2
1
4
AK402116
J/B side
connector
Connector: B-104
J/B (front side)
B-104
AC
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
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-320
STEP 6. Perform voltage measurement at A-08
engine-ECU connector.
•
Disconnect connector and measure at harness side.
• Voltage between terminal No. 110 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Check intermediate connector B-110, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-104 (terminal No. 2)
A/C compressor relay connector and A-08
(terminal No. 110) engine-ECU connector.
• Check signal line for open/short
circuit.
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
AK402116
J/B side
connector
Connector: B-104
J/B (front side)
B-104
AC
Main
Index
Group
TOC
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