Mitsubishi Colt Ralliart. Manual - part 749

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-321

STEP 7. Check harness between B-104 (terminal 
No. 2) A/C compressor relay connector and A-08 
(terminal No. 110) engine-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.

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

Q: Is the check result normal?

YES : 

Go to Step 9 .

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

AK402117

1

A-130(B)

Connector: A-130

Harness side 
connector

AC

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-322

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 or 

damage.

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Repair.

STEP 10. Confirm that A/C compressor is driven

•

Disconnect A-08 engine-ECU connector, and termi-

nal No. 110 is earth short-circuited.

OK: A/C compressor is driven

Q: Is the check result normal?

YES : 

Replace engine-ECU.

NO : 

Replace A/C compressor.

3

2

1

4

AK402116

J/B side 
connector

Connector: B-104
J/B (front side)

B-104

AC

AK402117

1

A-130(B)

Connector: 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

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-323

Inspection Procedure 25: 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 
(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. The engine-ECU knows 
the vehicle state through the stop lamp switch 
signal and carries out control of each system.

PROBABLE CAUSES

• Failed stop lamp switch

• Open/short circuit in stop lamp switch circuit or 

loose connector contact

• Failed engine-ECU

AK600592

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

2

1

6

5

4

B-59

A-08

3

128

B-108

B-112

Stop Lamp Switch Circuit

4

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  P: Purple

1

1

R

BR

L-O

Fusible link

42

15A

J/B

Stop lamp switch

Engine-ECU

AB

OFF

ON

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-324

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-59 stop lamp switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

STEP 3. Check stop lamp switch.

• Check stop lamp switch (Refer to GROUP 35A − 

On-vehicle Service 

− Brake Pedal Check And 

Adjustment 

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-59 
stop lamp switch connector.

• Disconnect connector and measure at harness 

side.

• Voltage between terminal No. 4 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Check intermediate connector B-112, B-108, 

and repair if necessary. If intermediate 
connectors are normal, check and repair 
harness between B-59 (terminal No. 4) stop 
lamp switch connector and battery.

• Check power supply line for 

open/short circuit.

AK600593

1

2

3

4

5

6

AB

Connector: B-59

Harness side 
connector

B-59

AK600593

1

2

3

4

5

6

AB

Connector: B-59

Harness side 
connector

B-59

Main

Index

Group

TOC