Mitsubishi L200. Manual — part 104

TROUBLESHOOTING

DIESEL FUEL

13A-212

STEP 10. Check EGR passage for air suction.

• Check the EGR valve, the EGR pipe and the

EGR cooler for the air suction.

Q: Is the check result normal?

YES :

Go to Step 11 .

NO :

Cleaning or replace the EGR valve, EGR
pipe and EGR cooler.

STEP 11. Connector check: A-135 air flow sensor
connector

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Repair or replace the connector.

STEP 12. Check harness between A-135 (terminal
No. 4) air flow sensor connector and C-103
(terminal No. 155) engine-ECU connector.

• Check earthing line for damage.

Q: Is the check result normal?

YES :

Go to Step 13 .

NO :

Repair the damaged harness wire.

AKA00399

AB

Harness side
connector

A-135 (B)

Connector: A-135

AKA00399

AB

Harness side
connector

A-135 (B)

Connector: A-135

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-213

STEP 13. Check harness between A-135 (terminal
No. 3) air flow sensor connector and C-103
(terminal No. 140) engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES :

Go to Step 14 .

NO :

Repair the damaged harness wire.

STEP 14. Replace the air flow sensor.

• After replacing the air flow sensor, re-check the

trouble symptoms.

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 ).

NO :

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 ). After
registering the injector identification code,
carry out the forcible DPF regeneration.
(Refer to GROUP 17

− Emission Control −

Diesel Particulate Filter (DPF) System

−

Forcible DPF Regeneration ).

AKA00399

AB

Harness side
connector

A-135 (B)

Connector: A-135

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-214

Code No. P0403: EGR Valve (DC Motor) Malfunction

OPERATION

• The electric current from the engine-ECU (termi-

nal No. 130 and No. 115) to the EGR valve (DC
motor) (terminal No. 4 and No. 6).

FUNCTION

• The engine-ECU performs duty control over the

EGR valve (DC motor).

• The engine-ECU performs feedback control over

the EGR valve based on the signals from the
EGR position sensor.

TROUBLE JUDGMENT

Check Condition

• Ignition switch is in "ON" position

Judgment Criterion

• An overcurrent cut-off signal from the EGR valve

drive control integrated circuit (IC) is detected for
0.5 second.

PROBABLE CAUSES

• Failed EGR valve

• Open/short circuit or harness damage in EGR

valve circuit or loose connector contact

• Failed engine-ECU

AKA00102

1

2 3

4

5 6

M

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

AB

115

6

V

Y-B

130

4

A-45

(MU802056)

EGR Valve (DC motor) Circuit

C-103

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

EGR valve assembly

Engine-ECU

TROUBLESHOOTING

DIESEL FUEL

13A-215

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-45 EGR valve
assembly connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace the connector.

STEP 2. Check EGR valve itself

• Check EGR valve itself [Refer to GROUP 17 −

Exhaust Gas Recirculation (EGR) System

− EGR

valve (DC motor) check ].

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace the EGR valve assembly.

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.

AK501331

1

2

3

4

5

6

AB

Harness side
connector

A-45 (GR)

Connector: A-45

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