Mitsubishi Colt Ralliart. Manual - part 677

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-33

STEP 4. Connector check: B-106 engine control 
relay connector

Q: Is the check result normal?

YES : 

Check intermediate connector B-112, and 

repair if necessary. If the intermediate 
connector is normal, check and repair the 
harness between A-34 (terminal No. 2) air 
flow sensor connector and B-106 (terminal 
No. 4) engine control relay connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace.

STEP 5. Perform resistance measurement at A-34 
air flow sensor 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 9 .

NO : 

Go to Step 6 .

STEP 6. Connector check: A-08 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair or replace.

3

2

1

4

AK402084

J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402083

2

1

3

4

Connector: A-34

Harness side 

connector

A-34 (GR)

AC

AK402083

2

1

3

4

Connector: A-34

Harness side 

connector

A-34 (GR)

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-34

STEP 7. Check harness between A-34 (terminal 
No. 4) air flow sensor connector and A-08 
(terminal No. 102) engine-ECU connector.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair.

STEP 8. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item 12: Air flow sensor

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

STEP 9. Connector check: A-08 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Repair or replace.

AK402083

2

1

3

4

Connector: A-34

Harness side 

connector

A-34 (GR)

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

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-35

STEP 10. Check harness between A-34 (terminal 
No. 3) air flow sensor connector and A-08 
(terminal No. 90) engine-ECU connector.

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

age. 

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair.

STEP 11. Connector check: B-106 engine control 
relay connector

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair or replace.

AK402083

2

1

3

4

Connector: A-34

Harness side 

connector

A-34 (GR)

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

3

2

1

4

AK402084

J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-36

STEP 12. Check harness between A-34 (terminal 
No. 2) air flow sensor connector and B-106 
(terminal No. 4) engine control relay connector.

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

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Repair.

STEP 13. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item 12: Air flow sensor

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 : 

Go to Step 14 .

STEP 14. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code after air flow 

sensor replacement

Q: Is the diagnosis code output?

YES : 

Replace engine-ECU.

NO : 

Check end.

AK402083

2

1

3

4

Connector: A-34

Harness side 

connector

A-34 (GR)

AC

3

2

1

4

AK402084

J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

Main

Index

Group

TOC