Mitsubishi Colt Ralliart. Manual - part 714

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-181

Q: Is the check result normal?

YES : 

Check and repair harness between B-106 

(terminal No. 4) engine control relay 
connector and B-121 (terminal No. 1) 
throttle valve control servo relay connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace the connector.

STEP 6. Perform voltage measurement at A-08 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 123 and earth.

OK: System voltage

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

AK402100

3

2

1

4

AC

Connector: B-121

J/B side 
connector

B-121

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-182

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Check intermediate connector B-110, and 

repair if necessary. If intermediate 
connector is normal, check and repair 
harness between B-121 (terminal No. 2) 
throttle valve control servo relay connector 
and A-08 (terminal No. 123) engine-ECU 
connector.

• Check earthing line for open/short 

circuit.

STEP 7. Perform voltage measurement at A-08 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 78 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Go to Step 8 .

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-183

STEP 8. Check harness between B-121 (terminal 
No. 4) throttle valve control servo relay 
connector and A-08 (terminal No. 78) engine-ECU 
connector.

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

• Check power supply line for open/short circuit.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

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

• Check output line for damage.

Q: Is the check result normal?

YES : 

Replace engine-ECU.

NO : 

Repair or replace the connector.

AK402100

3

2

1

4

AC

Connector: B-121

J/B side 
connector

B-121

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-184

STEP 10. Connector check: A-08 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace the connector.

STEP 11. Check and repair harness between 
B-121 (terminal No. 3) throttle valve control servo 
relay connector and battery.

NOTE:  Before checking harness, check intermedi-
ate connector B-108, and repair if necessary.

• Check power supply line for damage.

Q:  Is the harness connector in good condition?

YES : 

Go to Step 12 .

NO : 

Repair the damaged harness wire.

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

AK402100

3

2

1

4

AC

Connector: B-121

J/B side 
connector

B-121

Main

Index

Group

TOC