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

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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

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155

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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

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145

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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

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C-103 (B)

C-103 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-103

AB