Mitsubishi L200. Manual — part 847

SPECIAL TOOL

HEATER, AIR CONDITIONER AND VENTILATION

55A-4

SPECIAL TOOL

M1551000600740

Tool

Number

Name

Use

B991367

MB991367

Special spanner

Removal and installation
of A/C compressor
armature mounting nut

MB991386

Pin

MB991223

a

d

c

b

DO NOT USE

BA

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Test harness
b. LED harness
c. LED harness adapter
d. Probe

Making voltage and
resistance
measurements during
troubleshooting

a. Connect pin contact

pressure inspection

b. Power circuit

inspection

c. Power circuit

inspection

d. Commercial tester

connection

MB992006

MB992006

Extra fine probe

Continuity check and
voltage measurement at
harness wire or
connector

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1554004700997

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points .

TROUBLE SYMPTOM CHART

M1554005002265

Trouble symptom

Inspection procedure
number

Reference page

Cool air does not come

1

P.55A-6

The blower does not work

2

P.55A-17

The blower air volume cannot be changed

3

P.55A-26

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-5

The A/C compressor and clutch assembly does not work 4

P.55A-30

Condenser fan does not operate <Vehicles with
condenser fan>

5

P.55A-36

The rear window demister does not work

6

P.55A-42

The PTC heater does not work <Vehicles with PTC
heater>

7

P.55A-53

Trouble symptom

Inspection procedure
number

Reference page

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-6

SYMPTOM PROCEDURES

Inspection Procedure 1: Cool air does not come

A/C Compressor Control Circuit

IGNITION
SWITCH (IG2)

BLOWER
RELAY

BLOWER
SWITCH

A/C
SWITCH
MODULE

A/C
EVAPORATOR
AIR OUTLET
THERMISTOR

DUAL
PRESSURE
SWITCH

LOW-
PRESSURE
SIDE

HIGH-
PRESSURE
SIDE

ENGINE-ECU

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

ACB01739

ENGINE-ECU

<EURO5>

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

A/C Compressor and Clutch Assembly Circuit

IGNITION
SWITCH (IG2)

RELAY
BOX

A/C COMPRESSOR
RELAY

A/C
COMPRESSOR
AND CLUTCH
ASSEMBLY

ENGINE-ECU

FUSIBLE
LINK

20

A/C
COMPRESSOR
CLUTCH ASSEMBLY

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55A-7

CIRCUIT OPERATION
While the engine is running, with the blower switch
ON, and when the temperature control dial is set to
MAX COOL, if cool air does not come out from the
vents, A/C compressor control circuit system may be
defective.

PROBABLE CAUSES

• Malfunction of the A/C evaporator air outlet ther-

mistor

• Malfunction of the dual pressure switch

• Malfunction of the engine-ECU

• Damaged the wiring harness or connectors

• Improper amount of refrigerant