Mitsubishi L200. Manual - part 177

TROUBLESHOOTING

DIESEL FUEL

13A-504

STEP 2. Connectors check: B-05 4LLC switch 
connector and C-105 engine-ECU connector

Q: Are the check results normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

STEP 3. check harness between C-105 (terminal 
No. 13) engine-ECU connector and B-05 (terminal 
No. 1) 4LLC switch connector.

NOTE: Before checking harness, check intermediate 
connectors C-29 and A-115, and repair if necessary.

Q: Is the check result normal?

AK801710AB

Harness side
connector

Connector: B-05

B-05

1

AKA00089

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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

AK801710AB

Harness side
connector

Connector: B-05

B-05

1

AKA00089

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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

TROUBLESHOOTING

DIESEL FUEL

13A-505

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, 
the vehicle equipped with the DPF carries 
out the forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

NO : 

Repair the harness wire.

TROUBLESHOOTING

DIESEL FUEL

13A-506

Inspection Procedure 21: Condenser Fan Relay System <Vehicles with A/C condenser fan>

OPERATION

• The A/C condenser fan relay is controlled by turn-

ing on and off the power transistor in the engine-
ECU.

• In response to the A/C switch signal, A/C load 

signal, vehicle speed and engine coolant temper-
ature, the engine-ECU controls the condenser 
fan relay.

PROBABLE CAUSES

• Failed condenser fan relay

• Failed condenser fan motor

• Damaged harness (Open or short circuit between 

engine-ECU and condenser fan relay, Open cir-
cuit between condenser fan motor and earth, 
condenser fan relay and J/B, condenser fan relay 
and relay box, and open circuit between con-
denser fan relay and condenser fan motor)

AKB00293

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M

1 2

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10 1112 13 14 15 16 17 18 19 20 21 22 23 24

25 26

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72

43 44 45 46 47 48

73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

1 2 3
4 5 6

Fusible link 20

IG2

ST

LOCK

ACC

IG1

Ignition switch

4

Condenser Fan Relay Circuit

C-307

R

W

16

7.5A

5

20A

L-R

L-R

L-B

A-120

MU802601

A/C condenser 
fan motor

B

C-207

C-210

J/B

Relay 
box

1

4

2

21

1

A-115

LG-R

LG-R

Engine-ECU

C-105

3

2

1

9

6

Condenser fan relay

A-14X

OFF

ON

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

AB

B

TROUBLESHOOTING

DIESEL FUEL

13A-507

• Damaged connector (condenser fan relay con-

nector, condenser fan motor connector, Engine-
ECU connector)

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-542

.

a. Item 26: A/C load signal

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check A/C system (Refer to GROUP 55A 

− 

Troubleshooting 

− Check Chart for Trouble 

Symptoms  <Manual A/C>, GROUP 55B 

− 

Troubleshooting 

− Trouble Symptom Chart  

<Automatic A/C>).

STEP 2. Check at C-105 engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Short-circuit terminal No. 21 to earth.

OK: Condenser fan motor rotates

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Check condenser fan system (Refer to 
GROUP 55A 

− Troubleshooting − Trouble 

Symptom Chart  <Manual A/C>, GROUP 
55B 

− Troubleshooting − Trouble Symptom 

Chart  <Automatic A/C>).

STEP 3. Connector check: C-105 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 ). After 
registering the injector identification code, 
the vehicle equipped with the DPF carries 
out the forcible DPF regeneration. (Refer to 
GROUP 17 

− Emission Control − Diesel 

Particulate Filter (DPF) System 

− Forcible 

DPF Regeneration ).

NO : 

Repair or replace.

AKA00089

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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

AKA00089

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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