Mitsubishi L200. Manual - part 120

TROUBLESHOOTING

DIESEL FUEL

13A-276

• The engine-ECU checks whether the amount of 

current for driving duty is adequate.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

• 2 seconds later after the ignition switch has been 

in "ON" position or the engine has started up.

• The supply pump and injector are being normally 

controlled.

• The fuel injection rate is 4 mm

3

/st or more.

Judgment Criterion

• When the driving duty ratio of the suction control 

valve is higher than the specified value, the driv-
ing current is lower than the specified value.

PROBABLE CAUSES

• Failed suction control valve

• Open/short circuit or harness damage in suction 

control valve circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-47 suction control 
valve connector

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace the connector.

STEP 2. Check suction control valve itself.

• Check suction control valve itself (Refer to 

P.13A-

596

).

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Replace the suction control valve.

STEP 3. Connector check: C-103 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair or replace the connector.

AK503644

2

1

A-47 (GR)

Harness side 
connector

AB

Connector: A-47

AKA00090

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

146

147

148

149

150

151

152

153

154

155

156

157

158

117

145

116

144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

TROUBLESHOOTING

DIESEL FUEL

13A-277

STEP 4. Check harness between C-103 (terminal 
No. 131) engine-ECU connector and A-47 
(terminal No. 1) suction control valve connector.

• Check power supply line for open/short circuit 

and damage.

Q: Is the check result normal?

YES : 

Go to Step 5 . 

NO : 

Repair the damaged harness wire.

STEP 5. Check harness between C-103 (terminal 
No. 146) engine-ECU connector and A-47 
(terminal No. 2) suction control valve connector.

• Check earthing line for open/short circuit and 

damage.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair the damaged harness wire.

STEP 6. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

AKA00090

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

146

147

148

149

150

151

152

153

154

155

156

157

158

117

145

116

144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

AK503644

2

1

A-47 (GR)

Harness side 
connector

AB

Connector: A-47

AKA00090

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

146

147

148

149

150

151

152

153

154

155

156

157

158

117

145

116

144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB

AK503644

2

1

A-47 (GR)

Harness side 
connector

AB

Connector: A-47

TROUBLESHOOTING

DIESEL FUEL

13A-278

YES : 

Replace the engine-ECU. When the engine-

ECU is replaced, write the chassis number 
(Refer to GROUP 00 

− Precautions Before 

Service 

− How to Perform Chassis Number 

Writing ). After replacing the engine-ECU, 
register the injector identification code and 
learn fuel injection (Refer to GROUP 00 

− 

Precautions Before Service 

− What The 

Common Rail Engine Learns ).

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/

Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

Code No. P0629: Suction Control Valve Battery Short <Except Euro5>

OPERATION

• The voltage is applied from the engine-ECU (ter-

minal No. 131) to the suction control valve (termi-
nal No. 1) via the power transistor in the engine-
ECU.

• The voltage is earthed to the engine-ECU (termi-

nal No. 146) from the suction control valve (termi-
nal No. 2).

FUNCTION

• The engine-ECU performs duty control over the 

suction control valve.

• The engine-ECU checks whether the amount of 

current for driving duty is adequate.

TROUBLE JUDGMENT

Check Conditions

• Battery positive voltage is 8 − 16 V

AKA00106

1

2

101 102

103104 105 106107 108109 110 111112 113 114115

118119 120 121122 123124 125126127 128 129130

131132 133 134135 136137 138139140 141142 143

146147 148 149150 151152 153154155 156 157158

117

145

116

144

Suction Control Valve Circuit

Suction
control
valve

A-47

(MU802768)

C-103

SB

P

2

146

131

1

Engine-ECU

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Grey
R: Red  P: Pink  V: Violet  PU: Purple  SI: Silver

AB

TROUBLESHOOTING

DIESEL FUEL

13A-279

• 2 seconds later after the ignition switch has been 

in "ON" position or the engine has started up

• The supply pump and injector are being normally 

controlled.

• The fuel injection rate is 4 mm

3

/st or more.

Judgment Criterion

• When the driving duty ratio of the suction control 

valve is lower than the specified value, the driving 
current is higher than the specified value.

PROBABLE CAUSES

• Failed suction control valve

• Short circuit in suction control valve circuit or 

loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-47 suction control 
valve connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair or replace the connector.

STEP 2. Check suction control valve itself.

• Check suction control valve itself (Refer to 

P.13A-

596

).

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the suction control valve.

STEP 3. Connector check: C-103 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4. 

NO : 

Repair or replace the connector.

AK503644

2

1

A-47 (GR)

Harness side 
connector

AB

Connector: A-47

AKA00090

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

146

147

148

149

150

151

152

153

154

155

156

157

158

117

145

116

144

C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB