Mitsubishi L200. Manual — part 878
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-41
Inspection Procedure 3: The blower air volume cannot be changed
Blower Motor Circuit
FUSIBLE
LINK
20
IGNITION
SWITCH (IG2)
BLOWER
RELAY
A/C-ECU
BLOWER
MOTOR
POWER
TRANSISTER
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
AC805774 AB
COMMENTS ON TROUBLE SYMPTOM
If the blower air amount cannot be changed when the
blower switch is operated, the blower switch may be
defective.
TROUBLESHOOTING HINTS
• Malfunction of the resistor
• Damaged the wiring harness or connectors
• Malfunction of the automatic A/C control panel (A/
C-ECU)
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-42
DIAGNOSIS PROCEDURE
STEP 1. 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 2.
NO :
Repair the connector.
STEP 2. 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 3.
NO :
Repair the wiring harness.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-43
STEP 3. 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 4.
NO :
Repair the connector.
STEP 4. 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 5.
NO :
Repair the wiring harness.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-44
STEP 5. 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
Ω)
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
STEP 6. 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 7. 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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