Mitsubishi L200. Manual - part 877

 

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Mitsubishi L200. Manual - part 877

 

 

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-37

STEP 11. Check the wiring harness between C-
201 blower relay connector terminal No.2 and 
earth.

AC509934 AW

Connectors: C-201, C-208 <LHD>

Junction block side

Junction block (Front view)

C-201

Harness side

C-208

C-201

C-208

AC509936BN

Connectors: C-201, C-208 <RHD>

Junction block side

Junction block (Front view)

C-201

Harness side

C-201

C-208

C-208

NOTE: Prior to the wiring harness inspection, check 
junction block connector C-208, and repair if neces-
sary.

• Check the blower relay earth line for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

NO : 

Repair the wiring harness.

STEP 12. Check the wiring harness between C-
201 blower relay connector terminal No.3 and C-
28 blower motor connector terminal No.1.

AC509613

Connector: C-28 <LHD>

BU

Harness side

AC509934 AU

Connectors: C-201, C-207 <LHD>

Junction block side

Junction block (Front view)

C-201

Harness side

C-207

C-201

C-207

AC509930BU

Connector: C-28 <RHD>

Harness side

AC509936 AQ

Connectors: C-201, C-207 <RHD>

Junction block side

Junction block (Front view)

C-201

Harness side

C-207

C-201

C-207

NOTE: Prior to the wiring harness inspection, check 
junction block connector C-207, and repair if neces-
sary.

• Check the blower relay power supply line for 

open circuit.

Q: Is the check result normal?

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-38

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

NO : 

Repair the wiring harness.

STEP 13. Connector check: C-46 power 
transistor connector

AC509611CG

Connector: C-46 <LHD>

Harness side

AC509932CN

Harness side

Connector: C-46 <RHD>

Q: Is the check result normal?

YES : 

Go to Step 14.

NO : 

Repair the connector. 

STEP 14. Check the wiring harness between C-28 
blower motor connector terminal No.2 and C-46 
power transistor connector terminal No.1.

AC509613

Connector: C-28 <LHD>

BU

Harness side

AC509930BU

Connector: C-28 <RHD>

Harness side

AC509611CG

Connector: C-46 <LHD>

Harness side

AC509932CN

Harness side

Connector: C-46 <RHD>

• Check the blower relay earth wires for open cir-

cuit.

Q: Is the check result normal?

YES : 

Go to Step 15.

NO : 

Repair the wiring harness.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-39

STEP 15. Connector check: C-44 A/C-ECU 
connector

AC509611CH

Connector: C-44 <LHD>

Harness side

AC509932CO

Connector: C-44 <RHD>

Harness side

Q: Is the check result normal?

YES : 

Go to Step 16.

NO : 

Repair the connector. 

STEP 16. Check the wiring harness between C-46 
power transistor connector (terminals 1 and 3) 
and C-44 A/C-ECU connector (terminals 36 and 
35).

AC509611 CK

Connectors: C-44,C-46 <LHD>

C-44 Harness side

C-46Harness side

C-44

C-46

AC509932CT

Connectors: C-44, C-46 <RHD>

C-44 
Harness side

C-46 Harness side

C-44 C-46

C-44 Harness side

• Check the A/C-ECU input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 17.

NO : 

Repair the wiring harness.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-40

STEP 17. Resistance measurement at the C-46 
power transistor connector.

AC509611CG

Connector: C-46 <LHD>

Harness side

AC509932CN

Harness side

Connector: C-46 <RHD>

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC310506IB

Connector C-46 
(Harness side)

(2) Measure the resistance between terminal 2 and 

body earth.

OK: Continuity (Less than 2

)

Q: Is the check result normal?

YES : 

Go to Step 19.

NO : 

Go to Step 18.

STEP 18. Check the wiring harness between C-46 
power transistor connector terminal No.2 and 
body earth.

AC509611CG

Connector: C-46 <LHD>

Harness side

AC509932CN

Harness side

Connector: C-46 <RHD>

• Check the power transistor earth line for open cir-

cuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction ).

NO : 

Repair the wiring harness.

STEP 19. Replace the power transistor, and then 
recheck the trouble symptom
 Check that the blower motor works normally.

Q: Is the check result normal?

YES : 

This diagnosis is complete.

NO : 

Replace the A/C-ECU.

 

 

 

 

 

 

 

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