Mitsubishi L200. Manual — part 889
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-85
STEP 5. Check the wiring harness between C-43
A/C-ECU connector terminal No.8 and the fusible
link (20).
AC509611AR
Connector: C-43 <LHD>
Harness side
AC509932AS
Harness side
Connector: C-43 <RHD>
NOTE:
AC509613
Connector: C-132 <LHD>
AD
C-132 (GR)
AC509930AE
Connector: C-132 <RHD>
C-132 (GR)
AC509934
Connectors: C-209, C-213 <LHD>
Junction block (Front view)
C-213
C-209
C-213
C-209
AC
Harness side
Harness side
AC509936
Connectors: C-209, C-213 <RHD>
C-213
C-209
AC
Junction block
(Front view)
C-213
C-209
Harness side Harness side
Prior to the wiring harness inspection, check joint
connector C-132, junction block connector C-213
and C-209, and repair if necessary.
• Check the A/C-ECU power supply 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.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-86
STEP 6. Resistance measurement at the C-43 A/
C-ECU connector.
AC509611AR
Connector: C-43 <LHD>
Harness side
AC509932AS
Harness side
Connector: C-43 <RHD>
(1) Disconnect the connector, and measure at the
wiring harness side.
AC310506
Connector C-43
(Harness side)
ID
(2) Continuity between terminal 22 and body earth
OK: Continuity (Less than 2
Ω)
Q: Is the check result normal?
YES :
Replace the A/C-ECU.
NO :
Go to Step 7.
STEP 7. Check the wiring harness between C-43
A/C-ECU connector terminal No.22 and body
earth.
AC509611AR
Connector: C-43 <LHD>
Harness side
AC509932AS
Harness side
Connector: C-43 <RHD>
NOTE:
AC509611AU
Connector: C-120 <LHD>
C-120 (L)
AC509932AZ
Connector: C-120 <RHD>
C-120 (L)
Prior to the wiring harness inspection, check joint
connector C-120, and repair if necessary.
• Check the A/C-ECU earth line for open circuit.
Q: Is the check result normal?
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-87
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
NO :
Repair the wiring harness.
Inspection Procedure 9: The outlet air temperature can not be changed even if the amount of solar
radiation changes
Photo Sensor 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
A/C-ECU
PHOTO SENSOR
AC806061
CIRCUIT OPERATION
When the blower air temperature can not be
changed even if the amount of solar radiation is
changed, the photo sensor may be defective.
PROBABLE CAUSES
• Malfunction of photo sensor
• Damaged harness wires and connectors
• Malfunction of the A/C-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code.
Check whether the A/C sets a diagnosis code or not.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to diagnosis code chart
STEP 2. M.U.T.-III data list.
Check that the following data list display contents are
normal. (Refer to
• Item 67: Photo sensor
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Go to Step 4.
STEP 3. Recheck the trouble symptom
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 :
Replace the automatic A/C control panel (A/
C-ECU).
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-88
STEP 4. Connector check: C-41 photo sensor
connector and C-44 A/C-ECU connector
AC510204 AB
Connectors: C-41, C-44 <LHD>
Harness side
C-44
C-41
C-41
C-44
Harness side
AC510216AB
Connectors: C-41, C-44 <RHD>
Harness side
C-44
C-41
C-41
C-44
Harness side
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
STEP 5. Check the wiring harness between C-41
photo sensor connector (terminal 1 and 2) and C-
44 A/C-ECU connector (terminal 41 and 38).
AC510204 AB
Connectors: C-41, C-44 <LHD>
Harness side
C-44
C-41
C-41
C-44
Harness side
AC510216AB
Connectors: C-41, C-44 <RHD>
Harness side
C-44
C-41
C-41
C-44
Harness side
NOTE:
AC509932BG
Connectors: C-137, C-138 <RHD>
C-138 (L)
C-138
C-137 (L)
C-137
AC509611CY
Connectors: C-137, C-138 <LHD>
C-138 (L)
C-138
C-137 (L)
C-137
Prior to the wiring harness inspection, check joint
connector C-137 and C-138, and repair if necessary.
• Check the A/C-ECU input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the wiring harness. Check that the A/
C works normally.
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