Mitsubishi Grandis. Manual — part 322
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-173
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
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.
AC310631AC
Connector: C-105 <RHD>
Harness side
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
AC310632AZ
Connectors: C-30, C-106 <RHD>
C-30
C-106
C-30
C-106
Harness side
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-174
INSPECTION PROCEDURE 26: A/C-ECU power supply system <LHD>
CIRCUIT OPERATION
If a power supply is not provided to the A/C-ECU, the
A/C-ECU power supply system or the earth system
may be defective.
POSSIBLE CAUSES
• Malfunction of the A/C-ECU
• Damaged harness wires and connectors
IGNITION
SWITCH (IG2)
IGNITION
SWITCH (ACC)
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
RELAY
BOX
POWER
SOURCE
POWER
SOURCE
BATTERY
BACK-UP
RELAY
BOX
FUSIBLE
LINK
26
A/C-ECU Power Supply Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-175
DIAGNOSIS
Step 1. Connector check: C-106 A/C-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
Step 2. 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) Measure the voltage between terminal 6 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 3.
Step 3. Check the wiring harness between C-106
A/C-ECU connector terminal No.6 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 A/C-ECU power supply line for open
circuit.
Q: Is the check result normal?
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310507
Connector C-106
(Harness side)
BI
AC310614
BH
Connectors: C-31, C-106 <LHD>
C-31
C-106
C-31
C-106
Harness side
AC310624
Connectors: C-202, C-205 <LHD>
AF
Junction block (Front view)
C-205
C-202
C-205
Harness side
C-202
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-176
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
Step 4. 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) Measure the voltage between terminal 5 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
Step 5. Check the wiring harness between C-106
A/C-ECU connector terminal No.5 and the
ignition switch (ACC).
NOTE: Prior to the wiring harness inspection, check
joint connector C-32 and intermediate connector
C-125, and repair if necessary.
• Check the A/C-ECU 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 6. Voltage measurement at C-106 A/C-ECU
connector.
(1) Disconnect the connector, and measure at the
AC310613
AB
Connector: C-106 <LHD>
Harness side
AC310507
Connector C-106
(Harness side)
BJ
AC310614
AQ
Connectors: C-32, C-106, C-125 <LHD>
C-106
C-125
C-106
Harness side
C-125
C-32
C-32
AC310613
AB
Connector: C-106 <LHD>
Harness side
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