Mitsubishi Grandis. Manual — part 321
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-169
YES :
Go to Step 2.
NO :
Repair the connector.
Step 2. Check the PTC heater switch.
Refer to
.
Q: Is the refrigerant temperature switch operating
properly?
YES :
Go to Step 3.
NO :
Replace the refrigerant temperature switch.
Step 3. Voltage measurement at C-30 PTC heater
switch connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Voltage between terminal 2 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
Step 4. Check the wiring harness between C-30
PTC heater switch connector terminal No.2 and
the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check joint
connector C-31 and junction block connector C-205
and C-202, and repair if necessary.
• Check the PTC heater switch 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.
AC310613
AM
Connector: C-30 <LHD>
Harness side
AC310507
Connector C-30
(Harness side)
DJ
AC310613
AM
Connector: C-30 <LHD>
Harness side
AC310619
Connectors: C-202, C-205 <RHD>
AF
Junction block (Front view)
C-205
C-202
C-205
Harness side
C-202
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-170
Step 5. Connector check: C-106 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Repair the connector.
Step 6. Check the wiring harness between C-30
PTC heater switch connector terminal No.1 and
C-106 A/C-ECU connector terminal No.26.
• Check the PTC heater switch 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
AC
Connector: C-105 <LHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310614
BG
Connectors: C-30, C-106 <LHD>
Harness side
C-30
C-106
C-30
C-106
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-171
INSPECTION PROCEDURE 25: PTC heater switch system <RHD>
COMMENTS ON TROUBLE SYMPTOM
If a PTC heater switch signal is not set to the
A/C-ECU, the PTC heater switch or the PTC heater
switch circuit system may be defective.
POSSIBLE CAUSES
• Malfunction of the PTC heater switch
• Malfunction of the automatic air conditioner
control panel (A/C-ECU)
DIAGNOSIS
Step 1. Connector check: C-30 PTC heater switch
connector
Q: Is the check result normal?
IGNITION
SWITCH (IG2)
PTC
HEATER
SWITCH
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 Switch Circuit
AC310631AJ
Connector: C-30 <RHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-172
YES :
Go to Step 2.
NO :
Repair the connector.
Step 2. Check the PTC heater switch.
Refer to
.
Q: Is the refrigerant temperature switch operating
properly?
YES :
Go to Step 3.
NO :
Replace the refrigerant temperature switch.
Step 3. Voltage measurement at C-30 PTC heater
switch connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Voltage between terminal 2 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Go to Step 4.
Step 4. Check the wiring harness between C-30
PTC heater switch connector terminal No.2 and
the ignition switch (IG2).
NOTE:
Prior to the wiring harness inspection, check joint
connector C-01 and junction block connector C-205
and C-202, and repair if necessary.
• Check the PTC heater switch power supply line
for open circuit.
Q: Is the check result normal?
AC310631AJ
Connector: C-30 <RHD>
Harness side
AC310507
Connector C-106
(Harness side)
BH
AC310632 AY
Connectors: C-01, C-30 <RHD>
C-01
C-30
C-01
C-30
Harness side
AC310619
Connectors: C-202, C-205 <RHD>
AF
Junction block (Front view)
C-205
C-202
C-205
Harness side
C-202
Harness side
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