Mitsubishi Grandis. Manual — part 305
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-105
Step 18. Check the wiring harness between C-206
PTC heater relay 1 connector terminal No.5 and
C-103 PTC heater connector terminal No.2.
• 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 19. Measure the voltage 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 4 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 28.
NO :
Go to Step 20.
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310618
Connector: C-206 <RHD>
AE
3
4
5
1
2
Junction block side
Junction block (Front view)
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
AC310507
Connector C-103
(Harness side)
CV
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-106
Step 20. Connector check: C-207 PTC heater
relay 2 controller connector
Q: Is the check result normal?
YES :
Go to Step 21.
NO :
Repair the connector.
Step 21. Check the PTC heater relay 2 continuity.
Refer to GROUP 55 - On vehicle service, power
relay
Q: Is the PTC heater relay 2 in good condition?
YES :
Go to Step 22.
NO :
Replace the PTC heater relay 2.
Step 22. Voltage measurement at C-207 PTC
heater relay 2 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 24.
NO :
Go to Step 23.
Step 23. Check the wiring harness between C-207
PTC heater relay 2 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 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.
AC310618
Connector: C-207 <RHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310618
Connector: C-207 <RHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310507AY
Connector C-207
(Junction block side)
3
4
5
1
2
AC310619
Connectors: C-202, C-203, C-207 <RHD>
AH
3
4
5
1
2
Junction block side
Junction block (Front view)
C-203
C-202
C-207
Harness side
C-202
C-207
Harness side
C-203
10
1
6
14
5
12
13
4
11
7
2
3
8
9
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-107
Step 24. Voltage measurement at C-207 PTC
heater relay 2 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 26.
NO :
Go to Step 25.
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.
AC310618
Connector: C-207 <RHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310507
3
4
5
1
2
Connector C-207
(Junction block side)
AZ
AC310618
Connector: C-207 <RHD>
AF
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
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-108
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.
• 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.
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.
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-207 <RHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
AC310631AF
Connector: C-103 <RHD>
Harness side
AC310618
Connector: C-207 <RHD>
AF
3
4
5
1
2
Junction block side
Junction block (Front view)
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