Mitsubishi Grandis. Manual — part 304
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-101
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. Measure the resistance 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.
Step 9. Connector check: C-105 A/C-ECU
connector
Q: Is the check result normal?
AC310506AQ
Connector C-106
(Harness side)
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310506AR
Connector C-106
(Harness side)
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-102
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.
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 GROUP 55 - On vehicle service, power
relay
Q: Is the PTC heater switch relay 1 in good condition?
YES :
Go to Step 13.
NO :
Replace the PTC heater switch relay 1.
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC309471
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC309471
Connector C-105
(Harness side)
AE
AC310507AU
Connector C-103
(Harness side)
AC310618
Connector: C-206 <RHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-103
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.
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 and C-203, and
repair if necessary.
• Check the PTC heater relay 1 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 15. Measure the voltage at C-206 PTC heater
relay 1 connector.
(1) Remove the relay, and measure at the relay block
AC310618
Connector: C-206 <RHD>
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
AC310619
Connectors: C-202, C-203, C-206 <RHD>
AG
3
4
5
1
2
Junction block side
Junction block (Front view)
C-203
C-202
C-206
Harness side
C-202
C-206
Harness side
C-203
10
1
6
14
5
12
13
4
11
7
2
3
8
9
AC310618
Connector: C-206 <RHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-104
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.
Step 16. Check the wiring harness between C-206
PTC heater relay 1 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 1 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 17. Check the wiring harness between C-206
PTC heater relay 1 connector terminal No.1 and
C-105 A/C-ECU connector terminal No.46.
• Check the PTC heater relay 1 earth line for open
or short circuit.
Q: Is the check result normal?
YES :
Go to Step 18.
NO :
Repair the wiring harness.
AC310507
3
4
5
1
2
Connector C-206
(Junction block side)
AW
AC310618
Connector: C-206 <RHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310628AK
Connector: C-124 <RHD>
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
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310618
Connector: C-206 <RHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
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