Mitsubishi Colt Ralliart. Manual - part 90

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-314

STEP 7. Check harness between B-104 (terminal 
No. 2) A/C compressor relay connector and A-08 
(terminal No. 81

*1

 or No. 110

*2

) engine-ECU 

connector or engine-CVT-ECU connector.

NOTE: Before checking harness, check intermediate 
connector B-110, and repair if necessary.

• Check signal line for damage.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair the damaged harness wire.

STEP 8. Connector check: A-130 A/C compressor 
relay connector

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair or replace the connector.

3

2

1

4

AK402066

B-104
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

AG

A-08

Connector: 

A-08

Harness side connector

Battery

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

AK402067

1

Connector: A-130

A-130 (B)

A-130 Harness side
connector

AC

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-315

STEP 9. Check harness between B-104 (terminal 
No. 4) A/C compressor relay connector and 
A-130 (terminal No. 1) A/C compressor 
connector.

NOTE: Before checking harness, check intermediate 
connector B-112, A-17, and repair if necessary.

• Check power supply line for open/short circuit 

and damage.

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Repair the damaged harness wire.

STEP 10. Confirmation of A/C compressor 
driving.

• Disconnect A-08 engine-ECU connector or 

engine-CVT-ECU connector, and terminal No. 
81

*1

 or No. 110

*2 

is earth short-circuited.

OK: The A/C compressor drives

Q: Is the check result normal?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Replace A/C compressor.

3

2

1

4

AK402066

B-104
J/B side 
connector

Connector: B-104
J/B (front side)

B-104

AC

AK402067

1

Connector: A-130

A-130 (B)

A-130 Harness side
connector

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

AG

A-08

Connector: 

A-08

Harness side connector

Battery

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-316

Inspection Procedure 27: Stop lamp switch system

OPERATION

• The battery voltage is applied to the stop lamp 

switch (terminal No. 2).

• The stop lamp switch output terminal (terminal 

No. 1) inputs the switch signal to the engine-ECU 
<M/T> or engine-CVT-ECU <CVT> (terminal No. 
128).

FUNCTION

• The system checks whether the vehicle has the 

illuminating stop lamp or not, and inputs the sig-
nal to the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>. The engine-ECU 
<M/T> or engine-CVT-ECU <CVT> knows the 
vehicle state through the stop lamp switch signal 
and carries out control of the each system.

POSSIBLE CAUSES

• Failed stop lamp switch

• Open/short circuit in stop lamp switch or loose 

connector contact

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

AK503632

2

1

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-27

MU801491

A-08

1

128

B-108

B-112

Stop Lamp Switch Circuit

2

22

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

1

1

R

BR

L-O

Fusible link

42

15A

J/B

Stop lamp switch

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

AC

OFF

ON

To stop lamp

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-317

DIAGNOSIS PROCEDURE

STEP 1. Check for height of brake pedal.

• Check for height of brake pedal (Refer to GROUP 

35A 

− On-vehicle Service − Brake Pedal Check 

And Adjustment 

P.35A-7

).

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Adjust.

STEP 2. Connector check: B-27 stop lamp switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Check the stop lamp switch.

• Check the stop lamp switch (Refer to GROUP 

35A 

− Brake Pedal Inspection 

P.35A-22

).

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace stop lamp switch.

STEP 4. Perform voltage measurement at B-27 
stop lamp switch connector

• Disconnect the connector and measure it at har-

ness side.

• Voltage between terminal No. 2 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Check for the intermediate connectors B-112 

and B-108 and repair if necessary. If 
intermediate connectors are normal, check 
and repair harness between B-27 (terminal 
No. 2) stop lamp switch connector and 
battery.

• Check power supply line open/short 

circuit supply.

2

1

3

4

AK402068AC

Connector: B-27

B-27

B-27 Harness side

connector

2

1

3

4

AK402068AC

Connector: B-27

B-27

B-27 Harness side

connector

Main

Index

Group

TOC