Mitsubishi Grandis. Manual — part 323
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-177
wiring harness side.
(2) Measure the voltage between terminal 4 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 7.
Step 7. Check the wiring harness between C-106
A/C-ECU connector terminal No.4 and the fusible
link (30).
NOTE: Prior to the wiring harness inspection, check
joint connector C-32 and intermediate connector
C-125, and repair if necessary.
• Check the rear fan 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.
Step 8. Measure the resistance at the C-106 front
power transistor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Continuity between terminal 7 and body earth
OK: 2
Ω or less
Q: Is the check result normal?
YES :
Replace the A/C-ECU.
NO :
Go to Step 9.
Step 9. Check the wiring harness between C-106
A/C-ECU connector terminal No.7 and body
earth.
• Check the A/C-ECU earth line for open circuit.
Q: Is the check result normal?
AC310507
Connector C-106
(Harness side)
BK
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
AC310506
Connector C-106
(Harness side)
AU
AC310613
AB
Connector: C-106 <LHD>
Harness side
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-178
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
NO :
Repair the wiring harness.
INSPECTION PROCEDURE 27: A/C-ECU power supply system <RHD>
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.
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
RELAY
BOX
FUSIBLE
LINK
26
POWER
SOURCE
POWER
SOURCE
BATTERY
BACK-UP
A/C-ECU Power Supply Circuit
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-179
POSSIBLE CAUSES
• Malfunction of the A/C-ECU
• Damaged harness wires and connectors
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.
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310507
Connector C-106
(Harness side)
BI
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55-180
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-01 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?
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.
AC310632AK
Connectors: C-01, C-106 <RHD>
C-01
C-106
C-01
C-106
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
AC310631AB
Connectors: C-106 <RHD>
Harness side
AC310507
Connector C-106
(Harness side)
BJ
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