Mitsubishi Grandis. Manual — part 296
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-69
Step 5. Check the wiring harness between C-10
outside/inside air selection damper control motor
connector terminal No.1 and the ignition switch
(IG2).
NOTE:
Prior to the wiring harness inspection, check joint
connector C-01 and junction block connectors C-205
and C-202, and repair if necessary.
• Check the motor 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.
Step 6. Check the outside/inside air selection
damper control motor
Refer to GROUP 55, Resistor, blower motor and
inside/outside air selection damper control motor
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Replace the outside/inside air selection
damper control motor.
Step 7. Connector check: C-105 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the connector.
AC310628AI
Harness side
Connector: C-10 <RHD>
AC310631AE
Connector: C-01 <RHD>
AC310619
Connectors: C-202, C-205 <RHD>
AF
Junction block (Front view)
C-205
C-202
C-205
Harness side
C-202
Harness side
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-70
Step 8. Check the wiring harness between C-105
A/C-ECU connector (terminals 37 and 38) and
C-10 outside/inside air selection damper control
motor connector (terminals 2 and 3).
• Check the motor activating lines for open or short
circuit.
Q: Is the check result normal?
YES :
Replace the automatic air conditioner
control panel (A/C-ECU).
NO :
Repair the wiring harness.
AC310628AI
Harness side
Connector: C-10 <RHD>
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-71
INSPECTION PROCEDURE 7: The compressor does not work <LHD>
COMMENTS ON TROUBLE SYMPTOM
When the A/C compressor does not work, the A/C
compressor circuit system or the CAN bus line may
be defective.
A/C
COMPRESSOR
RELAY
A/C
COMPRESSOR
ASSEMBLY
A/C-ECU
A/C
REFRIGERANT
TEMPERATURE
SWITCH
MAGNETIC
CLUTCH
IGNITION
SWITCH (IG2)
ENGINE-ECU <M/T>
ENGINE-A/T-ECU <A/T>
RELAY
BOX
FUSIBLE
LINK
26
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
A/C Compressor Assembly Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-72
POSSIBLE CAUSES
• Malfunction of A/C compressor
• Malfunction of A/C compressor relay
• Malfunction of A/C pressure sensor
• Damaged harness wires and connectors
• Malfunction of engine-ECU <M/T> or
engine-A/T-ECU <A/T>
• Malfunction of the A/C-ECU
Step 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus lines. (Refer to GROUP
54D
− Troubleshooting
Step 2. MUT-III diagnosis code
Check whether the air conditioner sets a diagnosis
code or not.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to diagnosis code chart
.
Step 3. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 04: Pressure sensor
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Inspection Procedure 18: Refer to A/C
pressure sensor system
Step 4. Connector check: B-120 A/C compressor
assembly connector and C-110 engine-ECU
connector <M/T> or engine-A/T-ECU <A/T>
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Voltage measurement at B-120 A/C
compressor assembly connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
AC311219
Connector: B-120 <LHD>
AB
Harness side
B-120 (B)
AC310615
AI
Harness side
Connector: C-110 <LHD>
C-110 (GR)
AC311219
Connector: B-120 <LHD>
AB
Harness side
B-120 (B)
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