Mitsubishi Colt Ralliart. Manual - part 59

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-190

STEP 10. Check harness between A-101 (terminal 
No. 2) oil feeder control valve connector and 
A-114 (terminal No. 52) engine-ECU connector or 
engine-CVT-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair the damaged harness wire.

STEP 11. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/Inspection 

Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

AK402003

1

2

AC

Connector: A-101

A-101 Harness side
connector

A-101 (B)

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

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18

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50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-191

Code No. P1602: Communication Malfunction (between Engine-ECU <M/T> or Engine-CVT-ECU 
<CVT> Main Processor and System LSI)

FUNCTION

• The engine-ECU <M/T> or engine-CVT-ECU 

<CVT> checks the communication status for 
abnormal conditions.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is "ON" position.

Judgement Criteria

• At abnormal communication with the system LSI 

<M/T>.

• The engine-CVT-ECU detects an error in commu-

nication with the throttle actuator control module 
for 0.07 second <CVT>.

PROBABLE CAUSE

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

DIAGNOSIS

STEP 1. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-192

Code No. P1603: Battery Backup Circuit Malfunction

OPERATION

• Power is directly supplied to the engine-ECU 

<M/T> or engine-CVT-ECU <CVT> (terminal No. 
82) from the battery.

FUNCTION

• The engine-ECU <M/T> or engine-CVT-ECU 

<CVT> is check the open circuit of battery 
backup line.

TROUBLE JUDGMENT

Check Conditions

• Ignition switch is in "ON" position <M/T>.

• After engine starting sequence is completed 

<CVT>.

Judgment Criteria

• Battery backup line voltage is 6 V or lower for 2 

seconds <M/T>.

• Battery backup line voltage is 10 V or lower for 2 

seconds <CVT>.

AK402698

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

10

AD

Fusible link 

R

R-B

82

Battery
backup

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

10A

Battery Backup Circuit

A-08

19

B-112

J/B

B-108

1

1

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  Pu: Purple

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-193

PROBABLE CAUSES

• Open/short circuit in battery backup line circuit or 

loose connector contact

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

• Temporarily place the ignition switch in "LOCK" 

(OFF) position, and 10 seconds after that, place it 
in "ON" position again.

Q: Is the diagnosis code P1603 set?

YES : 

Go to Step 2 .

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

STEP 2. Perform voltage measurement at A-08 
engine-ECU connector or engine-CVT-ECU 
connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 82 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Check intermediate connector B-112 and 

B-108, and repair if necessary. If 
intermediate connector is normal, check and 
repair harness between battery and A-08 
(terminal No. 82) engine-ECU connector or 
engine-CVT-ECU connector.

• Check power supply line for 

open/short circuit.

STEP 3. Check harness between battery and A-08 
(terminal No. 82) engine-ECU connector or 
engine-CVT-ECU connector.

NOTE:  Before checking harness, check intermedi-
ate connector B-108 and B-112, and repair if neces-
sary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 4 .

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

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89

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100

101

102

103

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105

106

115

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117

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107

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109

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111

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114

130

131

132

133

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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>

AK402725

77

78

79

80

81

82

83

84

92

93

94

95

96

97

98

99

85

86

87

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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>

Main

Index

Group

TOC