Mitsubishi Colt Ralliart. Manual - part 742

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-293

STEP 5. Connector check: B-141 ignition switch 
connector

Q: Is the check result normal?

YES : 

Check intermediate connector B-129, and 

repair if necessary. If intermediate 
connector is normal, check and repair 
harness between B-117 (terminal No. 1) fuel 
pump relay (1) connector and B-141 
(terminal No. 2) ignition switch connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace.

STEP 6. Perform voltage measurement at B-117 
fuel pump relay (1) connector.

• Remove relay, and measure at connector side.

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Check intermediate connector B-108, and 

repair if necessary. If intermediate 
connector is normal, check and repair 
harness between battery and B-117 
(terminal No. 3) fuel pump relay (1) 
connector.

• Check power supply line for 

open/short circuit.

1

2

3

4

5

6

AK402103

Connector: B-141

Harness side 
connector

B-141

AC

AK402110

3

2

1

4

AC

J/B side 
connector

Connector: B-117
J/B (front side)

B-117

AK402110

3

2

1

4

AC

J/B side 
connector

Connector: B-117
J/B (front side)

B-117

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-294

STEP 7. Perform resistance measurement at 
B-103 fuel pump relay (2) connector.

• Remove relay, and measure at connector side.

• Ignition switch: ON

• Resistance between terminal No. 2 and earth.

OK: Continuity

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 8 .

STEP 8. Connector check: A-08 engine-ECU 
connector

3

2

1

4

AK402111AC

J/B side 
connector

Connector: B-103
J/B (front side)

B-103

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

AK402111AC

J/B side 
connector

Connector: B-103
J/B (front side)

B-103

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-295

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-103 (terminal No. 2) fuel 
pump relay (2) connector and A-08 (terminal 
No. 81) engine-ECU connector.

• Check earthing line for open/short 

circuit.

NO : 

Repair or replace.

STEP 9. Perform voltage measurement at B-103 
fuel pump relay (2) connector.

• Remove relay, and measure at connector side.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Go to Step 10 .

STEP 10. Connector check: B-141 ignition switch 
connector

Q: Is the check result normal?

YES : 

Check intermediate connector B-129, and 

repair if necessary. If the intermediate 
connector is normal, check and repair 
harness between B-103 (terminal No. 1) fuel 
pump relay (2) connector and B-141 
(terminal No. 2) ignition switch connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace.

3

2

1

4

AK402111AC

J/B side 
connector

Connector: B-103
J/B (front side)

B-103

1

2

3

4

5

6

AK402103

Connector: B-141

Harness side 
connector

B-141

AC

3

2

1

4

AK402111AC

J/B side 
connector

Connector: B-103
J/B (front side)

B-103

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-296

STEP 11. Perform voltage measurement at B-103 
fuel pump relay (2) connector.

• Disconnect relay, and measure at connector side.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Check and repair harness between B-117 

(terminal No. 4) fuel pump relay (1) 
connector and B-103 (terminal No. 3) fuel 
pump relay (2) connector.

• Check power supply line for 

open/short circuit.

STEP 12. Connector check: C-16 fuel pump 
connector 

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Repair or replace.

STEP 13. Perform resistance measurement at 
C-16 fuel pump connector.

• Disconnect connector and measure at harness 

side.

• Resistance between terminal No. 4 and earth.

OK: Continuity (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Go to Step 14 .

AK402109

3

2

1

4

AC

J/B side 
connector

Connector: B-103, B-117
J/B (front side)

B-117

B-103

AK402112

1

2

3

4

5

AC

Connector: C-16

Harness side 
connector

C-16(G)

AK402112

1

2

3

4

5

AC

Connector: C-16

Harness side 
connector

C-16(G)

Main

Index

Group

TOC