Mitsubishi L200. Manual - part 101

TROUBLESHOOTING

DIESEL FUEL

13A-200

OPERATION

• The electrical current source is supplied from the 

engine control relay (terminal No.3) to the glow 
control unit (terminal No.6). Also, it is supplied 
from the glow control unit (terminal No.7) to the 
body earth.

• The request signal of operating the glow plug is 

input into the glow control unit (terminal No. 1) 
from the engine-ECU (terminal No.120).

• The voltage for the glow plug is applied from the 

battery to the glow control unit (terminal No.10).

• The voltage is applied from the glow control unit 

(terminal No.1, 2, 3 and 4) to each glow plug.

• The diagnosis signal is output from the glow con-

trol unit (terminal No.9) to the engine-ECU (termi-
nal No.126).

FUNCTION

• The voltage applied to the glow control unit (ter-

minal No.10) from the battery is applied to each 
glow plug in the duty ratio according to the signal 
from the engine ECU.

TROUBLE JUDGMENT

Check Conditions

• While the engine is running

• The electrical continuity duty to the glow plug is 

17 

− 83 %.

Judgment Criterion

• The information that the glow is abnormal is 

received from the glow control unit.

PROBABLE CAUSES

• Failed glow plug

• Failed glow control unit

• Open/short circuit or harness damage in glow 

plug circuit or loose connector contact.

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: A-151 glow control 
unit connector

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace the connector.

STEP 2. Connector check: A-153 No. 1 glow plug 
connector, A-154 No. 2 glow plug connector, A-
155 No. 3 glow plug connector and A-156 No. 4 
glow plug connector.

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

AKB00265

1

AB

A-153 (B)

A-154 (B)

A-155 (B)

A-156 (B)

Harness side
connector

Connectors: A-153, A-154, A-155 and A-156

TROUBLESHOOTING

DIESEL FUEL

13A-201

STEP 3. Check harness between A-151 (terminal 
No.1) glow control unit connector and A-153 
(terminal No.1) No.1 glow plug connector.

NOTE: Before checking harness, check intermediate 
connector A-150, and repair if necessary.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair the damaged harness wire.

STEP 4. Check harness between A-151 (terminal 
No. 2) glow control unit connector and A-154 
(terminal No. 1) No.2 glow plug connector.

NOTE: Before checking harness, check intermediate 
connector A-150, and repair if necessary.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair the damaged harness wire.

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

AKB00266

1

AB

A-153 (B)

Harness side
connector

Connector: A-153

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

AKB00267

1

AB

A-154 (B)

Harness side
connector

Connector: A-154

TROUBLESHOOTING

DIESEL FUEL

13A-202

STEP 5. Check harness between A-151 (terminal 
No. 3) glow control unit connector and A-155 
(terminal No. 1) No.3 glow plug connector.

NOTE: Before checking harness, check intermediate 
connector A-150, and repair if necessary.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair the damaged harness wire.

STEP 6. Check harness between A-151 (terminal 
No. 4) glow control unit connector and A-156 
(terminal No. 1) No.4 glow plug connector.

NOTE: Before checking harness, check intermediate 
connector A-150, and repair if necessary.

• Check output line for open/short circuit and dam-

age.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. Replace the glow control unit.

• After replacing the glow control unit, reconfirm 

whether the diagnosis code is set.

Q: Is the diagnosis code set?

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 ). 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 ).

NO : 

Check is end.

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

AKB00268

1

AB

A-155 (B)

Harness side
connector

Connector: A-155

AKB00264

4 3 2 1
8 7 6 5

11 10 9

AB

A-151 (B)

Harness side
connector

Connector: A-151

AKB00269

1

AB

A-156 (B)

Harness side
connector

Connector: A-156

TROUBLESHOOTING

DIESEL FUEL

13A-203

Code No. P0401: EGR Flow Insufficient <Euro5>

OPERATION

• Refer to Code No. P0102: Air Flow Sensor Circuit 

Low Input 

P.13A-68

.

• Refer to Code No. P0403: EGR Valve (DC Motor) 

Malfunction 

P.13A-215

.

• Refer to Code No. P0489: EGR Valve Position 

Sensor Circuit Low Input <Euro5> 

P.13A-240

.

FUNCTION

• The engine-ECU monitors the EGR flow rate.

TROUBLE JUDGMENT

Check Conditions

• Engine is running.

• Battery positive voltage is 8 − 16 V.

• Normal running (vehicle speed: 65 − 75 km/h, 

transmission: 5th <M/T>, D range <A/T>).

• The intake air temperature is from 20 to 40 °C.

Judgment Criterion

• The EGR flow rate is larger than target EGR flow 

rate by the rate that is more than the specified 
value.

PROBABLE CAUSES

• Failed EGR passage (leakage and clogged EGR 

passage)

• Harness damage in EGR valve circuit or loose 

connector contact

• Failed EGR valve operation

• Harness damage in air flow sensor circuit or 

loose connector contact

• Failed air flow sensor (abnormal output charac-

teristics)

• Failed engine-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Q: Is the diagnosis code P0403 or P2413 set?

YES : 

Inspection chart for diagnosis codes (Refer 

to 

P.13A-21

).

NO : 

Go to Step 2 .

STEP 2. Connector check: A-45 EGR valve 
assembly connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Connector check: C-103 and C-105 
engine-ECU connectors

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

AKB00270

1

2

3

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144

C-105 (B)

C-103 (B)

C-105 (B)

C-103 (B)

<R.H. drive vehicles>

C-105 Harness side connector

C-103 Harness side connector

<L.H. drive vehicles>

Connectors: C-103, C-105

AB