Mitsubishi L200. Manual - part 178

TROUBLESHOOTING

DIESEL FUEL

13A-508

Inspection Procedure 22: A/C Switch System

OPERATION

• The battery voltage is applied to the engine-ECU 

(terminal No. 8) from the A/C switch module.

PROBABLE CAUSES

• Failed A/C

• Failed A/C system

• Open/short circuit in A/C circuit or loose connec-

tor contact

• Failed engine-ECU

AKA00119

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BR-W

Engine-ECU

8

A/C evaporator air outlet thermistor <Manual A/C> or 

A/C-ECU <Automatic A/C>

A/C Switch circuit

C-105

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

AF

TROUBLESHOOTING

DIESEL FUEL

13A-509

DIAGNOSIS PROCEDURE

STEP 1. Perform voltage measurement at C-105 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Engine: Idling

• A/C set temperature:

Maximum Cool when temperature in cabin is 

25

°C or more

Maximum Hot when temperature in cabin is 25

°C 

or less

• Voltage between terminal No. 8 and earth.

OK: 

System voltage (when A/C is ON)
0.5 V or less (when A/C is OFF)

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 

− Check Chart for Trouble 

Symptoms  <Automatic A/C>).

STEP 2. Connector check: C-105 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

STEP 3. M.U.T.-III data list

• Item 25: A/C switch

a. Engine: Idling
b. A/C set temperature: 

Maximum Cool when temperature in cabin is 

25

°C or more

Maximum Hot when temperature in cabin is 

25

°C or less

OK: 

ON (when A/C is ON)
OFF (when A/C is OFF)

Q: Is the check result normal?

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

TROUBLESHOOTING

DIESEL FUEL

13A-510

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, 
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 ).

TROUBLESHOOTING

DIESEL FUEL

13A-511

Inspection Procedure 23: A/C Compressor Relay System

AKB00294

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4 5 6

Fusible link

W

IG2

ST

LOCK

ACC

IG1

16

7.5A

4

10A

L-R

L-R

L-R

O

Ignition switch

4

C-207

C-210

7

J/B

A/C compressor relay

Relay 
box

L-W

L-W

L-W

B-O

B-O

4

1

3

1

19

2

A-21X

A-33

MU802655

A/C compressor and clutch assembly

A/C
compressor
clutch assembly

4

A-115

A/C Compressor Relay Circuit

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

C-105

Engine-ECU

9

6

A-28

A-28

A-27

C-307

OFF

ON

R

20

4

5

AB