Mitsubishi Grandis. Manual — part 300
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-85
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Replace the automatic air conditioner
control panel (A/C-ECU).
Step 4. Connector check: C-03 photo sensor
connector and C-106 A/C-ECU connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Check the wiring harness between C-03
photo sensor connector (terminal 1 and 2) and
C-106 A/C-ECU connector (terminal 1 and 23).
• Check the A/C compressor relay power supply
line for open circuit.
Q: Is the check result normal?
AC310614
AK
Connectors: C-03, C-106 <LHD>
Harness side
C-106
C-03
C-106
Harness side
C-03
AC310632 AF
Connectors: C-03, C-106 <RHD>
Harness side
C-106
C-03
C-106
Harness side
C-03
AC310614
AK
Connectors: C-03, C-106 <LHD>
Harness side
C-106
C-03
C-106
Harness side
C-03
AC310632 AF
Connectors: C-03, C-106 <RHD>
Harness side
C-106
C-03
C-106
Harness side
C-03
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-86
YES :
Go to Step 6.
NO :
Repair the wiring harness. Check that the
air conditioner works normally.
Step 6. Replace the photo sensor and recheck
the trouble symptom
Check that the air conditioner works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the automatic air conditioner
control panel (A/C-ECU).
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-87
INSPECTION PROCEDURE 10: The PTC heater does not work <LHD>
COMMENTS ON TROUBLE SYMPTOM
When the PTC heater does not work under the
following conditions, the PTC heater switch system
or the PTC heater circuit system may be defective.
PTC heater operating conditions
• PTC heater switch: ON
• Air outlet: FOOT/DEF, FOOT, FACE/FOOT
• Temperature control dial: MAX HOT
• Coolant temperature: 82 degrees celsius or less
FUSIBLE
LINK
28
IGNITION
SWITCH (IG2)
PTC
HEATER
RELAY 2
PTC
HEATER
RELAY 1
PTC
HEATER
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
PTC Heater Relay Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-88
NOTE: When the coolant temperature becomes
above 82 degrees celsius and PTC heater stops the
operation, the PTC heater does not operate until
coolant temperature becomes below 72 degrees
celsius.
POSSIBLE CAUSES
• Malfunction of the PTC heater switch system
• Damaged the wiring harness or connectors
• Malfunction of the PTC heater relay 1
• Malfunction of the PTC heater relay 2
• Malfunction of the PTC heater
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
DIAGNOSIS
Step 1. MUT-III data list
Check that the following service data display
contents are normal. (Refer to
• Item 35: PTC heater switch
Q: Does the blower motor work normally?
YES :
Go to Step 4.
NO :
Go to Step 2.
Step 2. Connector check: C-106 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the connector.
Step 3. Voltage measurement at C-106 A/C-ECU
connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Turn the PTC heater switch to the "ON" position.
(4) Voltage between terminal 26 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 28.
NO :
Inspection Procedure 24: Refer to PTC
heater switch system <LHD>
Step 4. Connector check: C-103 PTC heater
connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310507
Connector C-106
(Harness side)
AT
AC310613
AF
Connector: C-103 <LHD>
Harness side
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