Mitsubishi Colt Ralliart. Manual - part 85

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-294

STEP 9. Check harness between A-08 (terminal 
No.110) engine-ECU connector or 
engine-CVT-ECU connector and B-103 (terminal 
No. 2) fuel pump relay (2) connector.

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

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

Go to Step 15 

NO : 

Repair the damaged harness wire.

STEP 10. M.U.T.-III actuator test

• Refer to Actuator Test Reference Table 

P.13A-341

.

a. Item 07: Fuel pump relay

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/Inspection 

Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

NO : 

Replace engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

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

• Remove relay, and measure at junction block 

side.

• Ignition switch: ON

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Go to Step 13 .

NO : 

Go to Step 12 .

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>

AK402063

3

2

1

4

AC

B-103
J/B side
connector

Connector: B-103
J/B (front side)

B-103

AK402063

3

2

1

4

AC

B-103
J/B side
connector

Connector: B-103
J/B (front side)

B-103

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-295

STEP 12. 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-103 (terminal No. 1) fuel 
pump relay (2) connector and B-141 
(terminal No. 2) ignition switch connector.

• Check power supply line for open 

circuit.

NO : 

Repair or replace the connector.

STEP 13. Perform voltage measurement at B-103 
fuel pump relay (2) connector.

• Disconnect relay, and measure at junction block 

side.

• Ignition switch: ON

• Voltage between terminal No. 3 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 14 .

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.

AK402054

B-141

AC

Connector: B-141

1

2

3

4

5

6

B-141 Harness
side connector

AK402063

3

2

1

4

AC

B-103
J/B side
connector

Connector: B-103
J/B (front side)

B-103

AK402061

3

2

1

4

AC

B-103, B-117
J/B side 
connector

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

B-117

B-103

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-296

STEP 14. Connector check: C-16 fuel pump 
connector

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair or replace the connector.

STEP 15. Perform resistance measurement at 
C-16 fuel pump connector.

• Remove 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 18 .

NO : 

Go to Step 16 .

STEP 16. Check harness between C-16 (terminal 
No. 4) fuel pump connector and body earth.

• Check earthing line for damage.

Q: Is the check result normal?

YES : 

Go to Step 17 

NO : 

Repair the damaged harness wire.

STEP 17. M.U.T.-III actuator test

• Refer to Actuator Test Reference Table 

P.13A-341

.

a. Item 07: Fuel pump relay

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/Inspection 

Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

NO : 

Replace engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

STEP 18. Perform voltage measurement at C-16 
fuel pump connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ST

• Voltage between terminal No. 5 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 23 .

NO : 

Go to Step 19 .

AK402064

1

2

3

4

5

AC

Connector: C-16

C-16

C-16 Harness side

connector

AK402064

1

2

3

4

5

AC

Connector: C-16

C-16

C-16 Harness side

connector

AK402064

1

2

3

4

5

AC

Connector: C-16

C-16

C-16 Harness side

connector

AK402064

1

2

3

4

5

AC

Connector: C-16

C-16

C-16 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-297

STEP 19. Check harness between B-103 (terminal 
No. 4) fuel pump relay (2) connector and C-16 
(terminal No. 5) fuel pump connector.

NOTE: Before checking harness, check intermediate 
connector B-128, and repair if necessary.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 20 .

NO : 

Repair the damaged harness wire.

STEP 20. Connector check: B-141 ignition switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 21 .

NO : 

Repair or replace the connector.

AK402063

3

2

1

4

AC

B-103
J/B side
connector

Connector: B-103
J/B (front side)

B-103

AK402064

1

2

3

4

5

AC

Connector: C-16

C-16

C-16 Harness side

connector

AK402054

B-141

AC

Connector: B-141

1

2

3

4

5

6

B-141 Harness
side connector

Main

Index

Group

TOC