Mitsubishi L200. Manual — part 879
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-45
Inspection Procedure 4: The inside/outside air changeover is impossible
Outside/Inside Air Selection Damper Control Motor Circuit
IGNITION
SWITCH (IG2)
OUTSIDE/INSIDE
AIR SELECTION
DAMPER CONTROL MOTOR
A/C-ECU
MOTOR DRIVE
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
COMMENTS ON TROUBLE SYMPTOM
When inside air cannot be changed to outside air
vice versa even if its changeover switch is on, the
outside/inside air selection damper control motor
system may be defective.
POSSIBLE CAUSES
• Malfunction of the outside/inside air selection
damper control motor
• Damaged the wiring harness or connectors
• Malfunction of the automatic A/C control panel (A/
C-ECU)
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-46
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-40 outside/inside air
selection damper control motor connector
AC509613
Connector: C-40 <LHD>
BK
Harness side
AC509930BH
Connector: C-40 <RHD>
Harness side
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
STEP 2. Voltage measurement at C-40 outside/
inside air selection damper control motor
connector.
AC509613
Connector: C-40 <LHD>
BK
Harness side
AC509930BH
Connector: C-40 <RHD>
Harness side
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
AC310507JN
Connector C-40
(Harness side)
(3) Measure the voltage between terminal 1 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 3.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-47
STEP 3. Check the wiring harness between C-40
outside/inside air selection damper control motor
connector terminal No.1 and the ignition switch
(IG2).
AC509613
Connector: C-40 <LHD>
BK
Harness side
AC509930BH
Connector: C-40 <RHD>
Harness side
NOTE:
AC509934 AS
Connectors: C-207, C-209 <LHD>
Harness side
C-209
C-207
Harness side
C-209
C-207
Junction block (Front view)
AC509936 AN
Connectors: C-207, C-209 <RHD>
Harness side
C-209
C-207
Harness side
C-209
C-207
Junction block (Front view)
Prior to the wiring harness inspection, check junction
block connectors C-209 and C-207, and repair if nec-
essary.
• Check the motor power supply 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 4. Check the outside/inside air selection
damper control motor
Refer to
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Replace the outside/inside air selection
damper control motor.
STEP 5. Connector check: C-43 A/C-ECU
connector
AC509611AR
Connector: C-43 <LHD>
Harness side
AC509932AS
Harness side
Connector: C-43 <RHD>
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the connector.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-48
STEP 6. Check the wiring harness between C-43
A/C-ECU connector (terminals 3 and 4) and C-40
outside/inside air selection damper control motor
connector (terminals 3 and 4).
AC509611AR
Connector: C-43 <LHD>
Harness side
AC509932AS
Harness side
Connector: C-43 <RHD>
AC509613
Connector: C-40 <LHD>
BK
Harness side
AC509930BH
Connector: C-40 <RHD>
Harness side
• Check the motor activating lines for open or short
circuit.
Q: Is the check result normal?
YES :
Replace the automatic A/C control panel (A/
C-ECU).
NO :
Repair the wiring harness.
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