Mitsubishi Grandis. Manual — part 303
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-97
Step 25. Check the wiring harness between C-207
PTC heater relay 2 connector terminal No.4 and
the fusible link (28).
NOTE:
Prior to the wiring harness inspection, check
intermediate connector C-124, and repair if
necessary.
• Check the PTC heater relay 2 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 26. Check the wiring harness between C-207
PTC heater relay 2 connector terminal No.1 and
C-105 A/C-ECU connector terminal No.46.
NOTE: Prior to the wiring harness inspection, check
joint connector C-01, and repair if necessary.
• Check the PTC heater relay 2 earth line for open
or short circuit.
Q: Is the check result normal?
YES :
Go to Step 27.
NO :
Repair the wiring harness.
AC310623
Connector: C-207 <LHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310613
AH
Connector: C-124 <LHD>
9
21
33
35
24
12
3 4
7
8
5 6
39
28
41
30
18
4243
31
1920
32
40
29
1617
38
27
15
37
36
26
14
13
25
2
1
34
23
11
10
22
AC310614
BB
Connectors: C-01, C-105 <LHD>
C-01
C-105
C-01
C-105
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310623
Connector: C-207 <LHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-98
Step 27. Check the wiring harness between C-207
PTC heater relay 2 connector terminal No.5 and
C-103 PTC heater connector terminal No.4.
• Check the PTC heater 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 28. Check the trouble symptom
Check that the PTC heater works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the A/C-ECU.
AC310613
AF
Connector: C-103 <LHD>
Harness side
AC310623
Connector: C-207 <LHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-99
INSPECTION PROCEDURE 11: The PTC heater does not work <RHD>
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
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
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 Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-100
• 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 25: Refer to PTC
heater switch system <RHD>
Step 4. Connector check: C-103 PTC heater
connector
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Repair the connector.
Step 5. Resistance measurement at the C-103
PTC heater connector.
(1) Disconnect the connector, and measure at the
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310507
Connector C-106
(Harness side)
AT
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310631AF
Connector: C-103 <RHD>
Harness side
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