Mitsubishi Grandis. Manual — part 311
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-129
Step 2. MUT-III actuator test
Carry out the actuator test. (Refer to
.)
• Item 04: Rear blower fan: OFF
• Item 05: Rear blower fan: AUTO <vehicles with
dual automatic A/C>
• Item 06: Rear blower fan: Lo
• Item 07: Rear blower fan: Middle
• Item 08: Rear blower fan: High
Q: Does the rear blower motor work normally?
YES :
Go to Step 3.
NO :
Go to Step 9.
Step 3. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 22: Rear blower fan
• Item 23: Rear blower fan (Target)
• Item 31: Rear fan SW (Front)
• Item 32: Rear control OFF switch
• Item 33: Rear control fan OFF switch
Q: Is the check result normal?
YES :
Go to Step 8.
NO <Item 22, 23, 32, 33 is abnormal> :
Go to Step
NO <Item 31 is abnormal> :
Refer to Inspection
Procedure 20: rear fan switch system
<LHD>
or Inspection Procedure
21: rear fan switch system <RHD>
.
Step 4. Connector check: E-03 rear heater
controller connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
STEP 5. Check the rear heater controller
Refer to
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Replace the rear heater controller.
AC310649
AB
Connector: E-03 <LHD>
Harness side
AC310653
AB
Connector: E-03 <RHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-130
Step 6. Connector check: C-104 A/C-ECU
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the connector.
AC310613
AK
Connector: C-104 <LHD>
Harness side
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
AC310631AH
Connector: C-104 <RHD>
Harness side
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-131
Step 7. Check the wiring harness between E-03
rear heater controller connector (terminals 4, 5,
6, 7, 8 and 9) and C-104 A/C-ECU connector
(terminals 70, 69, 68, 67, 66 and 65).
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-132
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-128, and repair if
necessary.
• Check the input line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the wiring harness.
STEP 8. 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 A/C-ECU.
AC310614
AN
Connectors: C-104, C-128 <LHD>
Harness side
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
C-104
C-128
C-104
C-128
AC310632AI
Connectors: C-104, C-128 <RHD>
Harness side
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
C-104
C-128
C-104
C-128
AC310649
AB
Connector: E-03 <LHD>
Harness side
AC310653
AB
Connector: E-03 <RHD>
Harness side
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