Mitsubishi Grandis. Manual — part 299
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-81
Step 8. Check the wiring harness between B-16X
A/C compressor relay connector terminal No.3
and the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check junction
block connectors C-202, C-205, joint connector C-01
and intermediate connector C-17, and repair if
necessary.
• Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
AC312170
A/C compressor relay
AC
Front of
vehicle
Connector: B-16X
Relay box side
AC310631AE
Connector: C-01 <RHD>
AC310628AJ
Connector: C-17 <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
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-82
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
Step 9. Measure the voltage at B-16X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay block
side.
(2) Voltage between terminal 4 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Go to Step 10.
Step 10. Check the wiring harness between
B-16X A/C compressor relay connector terminal
No.4 and the fusible link (26).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector A-16, and repair if necessary.
• Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
AC312170
A/C compressor relay
AC
Front of
vehicle
Connector: B-16X
Relay box side
AC301541HY
Connector B-16X
(Relay box side)
Front of
vehicle
1
3
2
4
AC312170
A/C compressor relay
AC
Front of
vehicle
Connector: B-16X
Relay box side
AC310403
AC
Connector: A-16 <LHD>
A-16 (B)
AC310398
AC
Connector: A-16 <RHD>
A-16 (B)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-83
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
Step 11. Check the wiring harness between
B-16X A/C compressor relay connector terminal
No.2 and C-110 engine-ECU <M/T> or
engine-A/T-ECU <A/T> connector terminal No.8.
• Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the wiring harness.
Step 12. Check the wiring harness between
B-16X A/C compressor relay connector terminal
No.1 and B-120 A/C compressor assembly
connector terminal No.1.
• Check the A/C compressor 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 13. Check the magnetic clutch operation.
Refer to
Q: Can the sound of the magnetic clutch (click) be
heard?
YES :
Go to Step 14.
NO :
Replace the compressor magnet clutch.
AC312170
A/C compressor relay
AC
Front of
vehicle
Connector: B-16X
Relay box side
AC310628AH
Harness side
Connector: C-110 <RHD>
C-110 (GR)
AC312170
A/C compressor relay
AC
Front of
vehicle
Connector: B-16X
Relay box side
AC311221
Connector: B-120 <RHD>
AB
Harness side
B-120 (B)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-84
Step 14. Check the refrigerant temperature
switch.
Refer to
.
Q: Is the refrigerant temperature switch operating
properly?
YES :
Go to Step 15.
NO :
Replace the refrigerant temperature switch.
Step 15. Check the refrigerant level.
Refer to
.
Q: Is the refrigerant level correct?
YES :
Go to Step 16.
NO :
Correct the refrigerant level (Refer to
On-vehicle Service
Step 16. Replace the A/C-ECU, and then recheck
the trouble symptom
Check that the compressor works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the engine-ECU or the
engine-A/T-ECU.
INSPECTION PROCEDURE 9: The outlet air temperature can not be changed even if the amount of
solar radiation changes
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.
POSSIBLE CAUSES
• Malfunction of photo sensor
• Damaged harness wires and connectors
• Malfunction of the A/C-ECU
DIAGNOSIS
Step 1. 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 2.
NO :
Refer to diagnosis code chart
.
Step 2. MUT-III data list.
Check that the following service data display
contents are normal. (Refer to
• Item 06: 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?
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
A/C-ECU
PHOTO SENSOR
Photo Sensor Circuit
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