Mitsubishi Grandis. Manual — part 293
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-57
Step 15. Connector check: C-12 front power
transistor controller connector
Q: Is the check result normal?
YES :
Go to Step 16.
NO :
Repair the connector.
Step 16. Resistance measurement at the C-12
front power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 2 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Go to Step 17.
Step 17. Check the wiring harness between C-12
front power transistor connector terminal No.2
and body earth.
• Check the blower linear controller 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.
AC310615
AG
Connector: C-12 <LHD>
Harness side
AC310628AG
Connector: C-12 <RHD>
Harness side
AC310615
AG
Connector: C-12 <LHD>
Harness side
AC310628AG
Connector: C-12 <RHD>
Harness side
AC310506
Connector C-12
(Harness side)
AP
AC310615
AG
Connector: C-12 <LHD>
Harness side
AC310628AG
Connector: C-12 <RHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-58
Step 18. Check the wiring harness between C-13
front blower motor connector terminal No.2 and
C-12 front power transistor controller connector
terminal No.4.
• Check the blower linear controller power supply
line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Repair the wiring harness.
Step 19. Check the wiring harness between C-106
A/C-ECU connector (terminals 2 and 3) and C-12
front power transistor controller connector
(terminals 3 and 1).
• Check the blower linear controller power supply
line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 20.
NO :
Repair the wiring harness.
AC310616
AB
Connectors: C-12, C-13 <LHD>
Harness side
C-12
C-13
C-12
Harness side
C-13
AC310629
AB
Connectors: C-12, C-13 <RHD>
Harness side
C-12
C-12
Harness side
C-13
C-13
AB
Connectors: C-12, C-13 <RHD>
Harness side
AC310615
AG
Connector: C-12 <LHD>
Harness side
AC310628AG
Connector: C-12 <RHD>
Harness side
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310631AB
Connectors: C-106 <RHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-59
Step 20. Replace the front power transistor and
recheck the trouble symptom
Check that the front blower motor operates normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
INSPECTION PROCEDURE 4: The blower air volume cannot be changed
COMMENTS ON TROUBLE SYMPTOM
If the blower air volume can not be changed when
the blower switch is operated, the circuit between
front power transistor and A/C-ECU may be
defective.
POSSIBLE CAUSES
• Front power transistor
• Damaged the wiring harness or connectors
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
Step 1. MUT-III actuator test
Carry out the actuator test. (Refer to
• Item 01, 02, 03: Blower motor
Q: Does the blower motor work normally?
YES :
Go to Step 2.
NO :
Go to Step 4.
FRONT
BLOWER
RELAY
FRONT POWER
TRANSISTOR
FRONT BLOWER
MOTOR
A/C-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 : Gray R : Red P : Pink V : Violet
Blower Motor Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-60
Step 2. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 20: Front blower fan
• Item 21: Front blower fan (Target)
Q: Does the blower motor work normally?
YES :
Go to Step 3.
NO :
Go to Step 10.
Step 3. Replace the front power transistor and
check the trouble symptom
Check that the front blower motor operates normally.
Q: Does the blower motor work normally?
YES :
This diagnosis is complete.
NO :
Replace the automatic air conditioner
control panel (A/C-ECU)
Step 4. Connector check: C-12 front power
transistor controller connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Resistance measurement at the C-12 front
power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 2 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
AC310615
AG
Connector: C-12 <LHD>
Harness side
AC310628AG
Connector: C-12 <RHD>
Harness side
AC310615
AG
Connector: C-12 <LHD>
Harness side
AC310628AG
Connector: C-12 <RHD>
Harness side
AC310506
Connector C-12
(Harness side)
AP
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