Mitsubishi L200. Manual - part 172

TROUBLESHOOTING

DIESEL FUEL

13A-484

STEP 10. Connector check: C-111 combination 
meter connector

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace the connector.

STEP 11. Check harness between A-122 (terminal 
No. 3) alternator connector and C-111 (terminal 
No. 52) combination meter connector.

NOTE: Before checking harness, check intermediate 
connectors A-27, C-14 <R.H. drive vehicles> and C-
54 <L.H. drive vehicles>, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Check the alternator.

NO : 

Repair the damaged harness wire.

AK700806

62

64

61 60 59 58

63

57

53

54

55

52 51

56

Harness side connector 

C-111

C-111

Connector: C-111

<R.H. drive vehicles>

<L.H. drive vehicles>

AB

AKB00292

M

2

1

3

4

AB

A-122 (GR)

Harness side
connector

Connector: A-122

AK700806

62

64

61 60 59 58

63

57

53

54

55

52 51

56

Harness side connector 

C-111

C-111

Connector: C-111

<R.H. drive vehicles>

<L.H. drive vehicles>

AB

TROUBLESHOOTING

DIESEL FUEL

13A-485

STEP 12. Perform voltage measurement at C-103 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Engine: Idling after warm-up

• Transmission: Neutral <M/T> or P range <A/T>

• Voltage between terminal No. 121 and earth.

OK: The voltage increases when the head-
lamp switch and the rear window defogger 
switch are turned ON from OFF.

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 ).

Inspection Procedure 14: Battery Rundown <Except Euro5>

PROBABLE CAUSES

• Failed battery

• Failed alternator

• Damaged harness (Circuit related to charging 

system has an open circuit or is earthed)

• Damaged connector (Circuit related to charging 

system)

DIAGNOSIS PROCEDURE

STEP 1. Check battery.

• Check battery (Refer to GROUP 54A − Battery − 

On-vehicle Service 

− Battery Test ).

Q: Is the check result normal?

YES : 

Check charging system (Refer to GROUP 

16 

− Charging System − On-vehicle Service 

− Output Current Test ).

NO : 

Replace the battery.

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-486

Inspection Procedure 15: Overheating

PROBABLE CAUSES

• Failed cooling fan system

• Insufficient or deteriorated engine coolant

• Failed thermostat

• Failed water pump

• Failed radiator core

DIAGNOSIS PROCEDURE

STEP 1. Check cooling system.

• Check cooling fan system (Refer to GROUP 55A 

− Troubleshooting − Symptom Procedures  
<manual A/C>, Refer to GROUP 55B 

− Trouble-

shooting 

− Symptom Procedures  <automatic A/

C>).

Q: Is the check result normal?

YES : 

Check cooling system.

NO : 

Repair or replace the failed item.

TROUBLESHOOTING

DIESEL FUEL

13A-487

Inspection Procedure 16: Engine-ECU Power Supply System

OPERATION

• When the ignition switch ON signal is input to the 

engine-ECU, the engine-ECU places the engine 
control relay in the ON position. Accordingly, the 
battery voltage is supplied to the engine-ECU, 

sensor and actuator.

PROBABLE CAUSES

• Failed battery

• Failed ignition switch

AKB00288

1

2

3
4

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

1 2 3
4 5 6

A-20X

C-103

IG2

ST

R

LOCK

ACC

IG1

10

20A

9

7.5A

Fusible link

Ignition switch

2

14

J/B

104

C-208

C-207

4

Engine 
control 
relay

4

1

3

2

118

102

101

117

145

116

C-103

B

B

B

Power
source

8

C-103

3

A-115

Relay 
box

W-R

W-B

B-W

L-B

Y-G

R

W-B

R

R

Power Supply and Ignition Switch-IG Circuit

Engine-ECU

C-307

OFF

ON

23

C-53*¹
or
C-35*²

W-B

W

AB

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

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles