Mitsubishi Grandis. Manual — part 298
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-77
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.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-78
INSPECTION PROCEDURE 8: The compressor does not work <RHD>
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 : Gray
R : Red P : Pink V : Violet
A/C Compressor Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-79
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 19: 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.
AC311221
Connector: B-120 <RHD>
AB
Harness side
B-120 (B)
AC310628AH
Harness side
Connector: C-110 <RHD>
C-110 (GR)
AC311221
Connector: B-120 <RHD>
AB
Harness side
B-120 (B)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-80
(2) Turn the ignition switch to the "ON" position.
(3) Disconnect engine-ECU connector or
engine-A/T-ECU connector C-110 and earth
terminal 8.
(4) Voltage between terminal 1 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Go to Step 6.
Step 6. Check the A/C compressor relay
continuity.
Refer to GROUP 55 - On vehicle service, power
relay
Q: Is the A/C compressor relay in good condition?
YES :
Go to Step 7.
NO :
Replace the A/C compressor relay.
Step 7. Measure the voltage at B-16X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay block
side.
(2) Turn the ignition switch to the "ON" position.
(3) Voltage between terminal 3 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 8.
AC310628AH
Harness side
Connector: C-110 <RHD>
C-110 (GR)
AC309471
AC309471
Connector C-110
(Harness side)
AF
AC310507AS
Connector B-120
(Harness side)
1
AC312170
A/C compressor relay
AC
Front of
vehicle
Connector: B-16X
Relay box side
AC301541HX
Connector B-16X
(Relay box side)
Front of
vehicle
1
3
2
4
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