Mitsubishi Grandis. Manual — part 301
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-89
Step 5. Resistance measurement at the C-103
PTC heater connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 1 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Go to Step 6.
Step 6. Check the wiring harness between C-103
PTC heater connector terminal No.1 and body
earth.
• Check the PTC heater earth 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 7. Resistance measurement at the C-103
PTC heater connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 3 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Go to Step 8.
Step 8. Check the wiring harness between C-103
PTC heater connector terminal No.3 and body
earth.
• Check the PTC heater earth 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.
AC310613
AF
Connector: C-103 <LHD>
Harness side
AC310506AQ
Connector C-106
(Harness side)
AC310613
AF
Connector: C-103 <LHD>
Harness side
AC310613
AF
Connector: C-103 <LHD>
Harness side
AC310506AR
Connector C-106
(Harness side)
AC310613
AF
Connector: C-103 <LHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-90
Step 9. Connector check: C-105 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the connector.
Step 10. Voltage measurement at C-103 PTC
heater connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Disconnect A/C-ECU connector C-105 and earth
terminal 46.
(4) Voltage between terminal 2 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Go to Step 11.
AC310613
AC
Connector: C-105 <LHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310613
AF
Connector: C-103 <LHD>
Harness side
AC310613
AC
Connector: C-105 <LHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC312783
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC312783
Connector C-105
(Harness side)
AB
AC310507AU
Connector C-103
(Harness side)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-91
Step 11. Connector check: C-206 PTC heater
relay 1 controller connector
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the connector.
Step 12. Check the PTC heater switch relay 1
continuity.
Refer to
.
Q: Is the PTC heater switch relay 1 in good condition?
YES :
Go to Step 13.
NO :
Replace the PTC heater switch relay 1.
Step 13. Voltage measurement at C-206 PTC
heater relay 1 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 15.
NO :
Go to Step 14.
AC310623
Connector: C-206 <LHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310623
Connector: C-206 <LHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310507
3
4
5
1
2
Connector C-206
(Junction block side)
AV
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-92
Step 14. Check the wiring harness between C-206
PTC heater relay 1 connector terminal No.3 and
the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check junction
block connectors C-202, C-203 and joint connector
C-32, and repair if necessary.
• Check the PTC heater relay 1 earth 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 15. Voltage measurement at C-206 PTC
heater relay 1 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 17.
NO :
Go to Step 16.
AC310624
Connectors: C-202, C-203, C-206 <LHD>
AG
3
4
5
1
2
Junction block side
Junction block (Front view)
C-206
C-202
C-206
Harness side
C-202
C-203
Harness side
C-203
10
1
6
14
5
12
13
4
11
7
2
3
8
9
AC310613
AG
Connector: C-32 <LHD>
AC310623
Connector: C-206 <LHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310507
3
4
5
1
2
Connector C-206
(Junction block side)
AW
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