Mitsubishi L200. Manual - part 181

TROUBLESHOOTING

DIESEL FUEL

13A-520

• Damaged harness (Open or short circuit between 

engine-ECU and glow plug relay, and open or 
short circuit between glow plug relay and glow 
plug, Open circuit between engine control relay 
and glow plug relay, engine control relay and fusi-
ble link, and open circuit between engine-ECU 
and combination meter)

• Damaged connector (Engine-ECU connector, 

glow plug relay connector, combination meter 
connector)

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the glow indicator lamp 
illuminates.

•  Ignition switch: ON

•  Engine coolant temperature: 40°C or lower

Q: Is the glow indicator lamp illuminates?

YES : 

Go to Step 4 .

NO : 

Go to Step 2 .

STEP 2. Connector check: C-105 engine-ECU 
connector and C-111 combination meter 
connector.

Q: Are the check results normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AK700806

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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-521

STEP 3. Perform voltage measurement at C-105 
engine-ECU connector.

• Disconnect connector, and measurement at har-

ness side.

•  Ignition switch: ON

• Voltage between terminal No. 22 and earth.

OK: System voltage

Q: Is the check result normal?

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 : 

Check intermediate connector C-53 <L. H. 
drive vehicles> or C-35 <R. H. drive 
vehicles>, and repair if necessary. If 
intermediate connector is normal, check and 
repair harness between C-111 (terminal No. 
51) combination meter connector and C-105 
(terminal No. 28) engine-ECU connector.

STEP 4. Connector checks: A-11, A-111 and A-
112 glow plug relay connectors.

Q: Are the check results normal?

YES : 

Go to Step 5 .

NO : 

Repair or replace.

STEP 5. Check the glow plug relay itself.

• Check the glow plug relay itself (Refer to GROUP 

16 

− Glow System − On-vehicle Service − Glow 

Plug Relay Check ).

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace the glow plug relay.

STEP 6. Perform voltage measurement at A-11 
glow plug relay connector.

• Disconnect connector, and measurement at har-

ness side.

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Check harness between fusible link No. 24 
and A-11 (terminal No. 1) glow plug relay 
connector.

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AC501628

AK501004

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1

2

Fuel filter

A-112 (B)

A-111 (GR)

A-11

Connector: A-11, A-111 and A-112

A-11, A-111 
Harness side connector

A-112 Harness side connector

AB

AC501628

AK501005

1

Fuel filter

A-11

Connector: A-11

AB

Harness side connector

TROUBLESHOOTING

DIESEL FUEL

13A-522

STEP 7. Perform voltage measurement at A-112 
glow plug relay connector.

• Disconnect connector, and measurement at har-

ness side.

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Check harness between A-112 (terminal No. 
1) glow plug relay connector and A-20X 
(terminal No. 3) engine control relay 
connector.

STEP 8. Check glow plug itself.

• Check glow plug itself (Refer to GROUP 16 − 

Glow System 

− On-vehicle Service − Glow Plug 

Check ).

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Replace the glow plug.

STEP 9. Check harness between A-111 (terminal 
No. 1) glow plug relay connector and A-06 
(terminal No. 1) glow plug connector.

Q: Is the check result normal?

YES : 

Go to Step 10 .

NO : 

Repair the harness wire.

AC501628

AK501006

1

2

Fuel filter

A-112 (B)

Connector: A-112

AB

Harness side connector

AC501628

AK501007

1

Fuel filter

A-111 (GR)

Connector: A-111

AB

Harness side connector

1

AK700923

Harness side connector

Connector: A-06

AB

A-06

TROUBLESHOOTING

DIESEL FUEL

13A-523

STEP 10. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace.

STEP 11. Check harness between A-112 (terminal 
No. 2) glow plug relay connector and C-105 
(terminal No. 20) engine-ECU connector.

Q: Is the check result normal?

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 : 

Repair the harness wire.

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB

AC501628

AK501006

1

2

Fuel filter

A-112 (B)

Connector: A-112

AB

Harness side connector

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C-105 (B)

C-105 (B)

<R.H. drive vehicles>

Harness side connector

<L.H. drive vehicles>

Connector: C-105

AB