Mitsubishi Lancer Evolution VI. Manual — part 123
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-44
Inspection procedure 3
A/C graphic display on control panel is blank.
Probable cause
The cause is probably a malfunction of the A/C-ECU power supply system
(earth).
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
Does the A/C operate?
NO
Inspection procedure 15 (Refer to P.55-52.)
YES
Replace the A/C-ECU.
Inspection procedure 4
Temperature cannot be set.
Probable cause
The cause is probably a malfunction of the temperature setting signal input
system or output system.
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
Inspection procedure 15 (Refer to P.55-52.)
Inspection procedure 5
A/C outlet air temperature does not increase.
Probable cause
If the outlet air temperature does not increase when the temperature setting is
increased, the cause is probably a sensor malfunction or a problem with
operation of the air mix damper. The MUT-
II
can be used to check the
diagnosis codes in order to check the cause of the problem for each separate
system.
D
Malfunction of air mix damper potentiometer
D
Malfunction of air mix damper motor
D
Malfunction of air mix damper
D
Malfunction of connector or harness
D
Malfunction of thermostat
D
Malfunction of A/C-ECU
MUT-
II
Self-Diag code
Is any of the codes 11, 12, 31 and 41 output?
YES
INSPECTION CHART FOR DIAGNOSIS CODES (Refer to
P.55-34.)
NO
Thermostat check
NG
Replace
OK
Replace the A/C-ECU.
Inspection procedure 6
A/C outlet air temperature does not decrease.
Probable cause
If the outlet air temperature does not decrease when the temperature setting is
decreased, the cause is probably a problem in A/C system operation due to a
sensor error, or a problem with operation of the air mix damper. The MUT-
II
can be used to check the diagnosis codes in order to check the cause of the
problem for each separate system.
D
Malfunction of outside air temperature sensor
D
Malfunction of air mix damper potentiometer
D
Malfunction of air mix damper motor
D
Malfunction of air thermo sensor
D
Malfunction of connector or harness
D
Malfunction of air mix damper
D
Malfunction of A/C-ECU
Does the A/C operate?
NO
Inspection procedure 2 (Refer to P.55-43.)
YES
MUT-
II
Self-Diag code
Is any of the codes 11, 12, 13, 14, 21, 22, 31 and 41 output?
YES
INSPECTION CHART FOR DIAGNOSIS CODES (Refer to
P.55-34.)
NO
Replace the A/C-ECU.
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-45
Inspection procedure 7
Blower does not operate.
Probable cause
If no air comes out of the blower even though the blower switch is on, the
cause is probably a malfunction of the blower motor relay circuit.
D
Malfunction of blower motor relay
D
Malfunction of blower motor
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
Can an operating sound be heard when the blower speed change-
over switch is operated?
NO
Inspection procedure 15 (Refer to P.55-52.)
YES
D
Blower motor relay check (Refer to P.55-13.)
D
Blower motor check (Refer to P.55-21.)
NG
Repair
OK
Measure at the blower motor relay connector B-72.
D
Disconnect the connector, and measure at the harness
side connector.
(1) Continuity between terminal (1) and body earth
OK: Continuity
(2) Voltage between terminal (3) and body earth (Ignition
switch: ON)
OK: System voltage
(3) Voltage between terminal (5) and body earth
OK: System voltage
(1) NG
Check the harness between the blower motor relay and the body
earth, and repair if necessary.
(2) NG
Check the harness between the blower motor relay and the ignition
switch, and repair if necessary.
(3) NG
Check the harness between the blower motor relay and the fusible
link No.1, and repair if necessary.
OK
Measure at the blower motor connector B-33.
D
Disconnect the connector, and measure at the harness
side connector.
D
Voltage between terminal (1) and body earth (Ignition
switch: ON)
OK: System voltage
NG
Check the following connector:
B-76
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor relay and the blower
motor, and repair if necessary.
OK
Check the following connector:
B-33
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor and earth, and
repair if necessary.
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-46
Inspection procedure 8
Blower does not operate in HI mode.
Probable cause
If the blower does not operate in HI mode when the temperature is set to 17 or
32, the cause is probably a malfunction of the blower motor HI relay circuit system.
D
Malfunction of blower motor HI relay
D
Malfunction of blower motor
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
A/C-ECU, and repair if necessary.
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
blower motor, and repair if necessary.
OK
Measure at the blower motor HI relay connector B-34.
D
Disconnect the connector, and measure at the harness
side connector.
(1) Connect terminal (1) to earth.
OK: Blower operates.
(2) Continuity between terminal (3) and body earth
OK: Continuity
(3) Voltage between terminal (4) and body earth (Ignition
switch: ON)
OK: System voltage
(1) NG
Check the following connector:
B-34
D
Blower motor HI relay check (Refer to P.55-57.)
D
Blower motor check (Refer to P.55-21.)
NG
Repair
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
body earth, and repair if necessary.
(2) NG
Check the following connector:
B-34
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness between the blower motor HI relay and the
junction block, and repair if necessary.
(3) NG
Check the following connector:
B-34
NG
Repair
OK
Check the trouble symptom.
YES
Check the following connector:
B-04
OK
Separate A/C-ECU connector B-04 and connect the terminal (12)
of the harness side connector to the earth. Does the blower
operate?
NO
Check the following connector:
B-34
NG
Replace the A/C-ECU.
FULL-AUTOMATIC AIR CONDITIONER –
Troubleshooting
55-47
Inspection procedure 9
Blower air amount cannot be changed.
Probable cause
If the blower does not operate in any mode other than HI setting, the cause is
probably a malfunction of the power transistor system.
D
Malfunction of power transistor
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
Measure at the power transistor connector B-37.
D
Blower switch position: LO
D
Connect the connector.
(1) Continuity between terminal (1) and body earth
OK: Continuity
(2) Voltage between terminal (2) and body earth (Ignition
switch: ON)
OK: System voltage – 2 V
(3) Voltage between terminal (4) and body earth (Ignition
switch: ON)
OK: Approx. 1.3 V
OK
Check the following connector:
B-37
NG
Repair
OK
Check the trouble symptom.
(1) NG
Check the harness between the power transistor and the body
earth, and repair if necessary.
(2) NG
Check the harness between the power transistor and the blower
motor, and repair if necessary.
(3) NG
Measure at the A/C-ECU connector B-04.
D
Blower switch position: LO
D
Connect the connector.
(1) Voltage between terminal (1) and body earth (Ignition
switch: ON)
OK: Approx. 7 V
(2) Voltage between terminal (2) and body earth (Ignition
switch: ON)
OK: Approx. 1.3 V
NG
Check the following connector:
B-04
NG
Repair
OK
Check the trouble symptom.
OK
Check the harness between the power transistor and the A/C-ECU.
NG
Repair
OK
Replace the power transistor.
NG
Replace the power transistor.
NG
Replace the A/C-ECU.
Inspection procedure 10
Air outlet port cannot be changed.
Probable cause
The cause is probably a malfunction of the air outlet port changeover signal
input system or output system. The MUT-
II
can be used to check the
diagnosis codes in order to check the cause of the problem for each separate
system.
D
Malfunction of air outlet changeover damper
potentiometer
D
Malfunction of air outlet changeover damper
motor
D
Malfunction of air outlet changeover damper
D
Malfunction of connector or harness
D
Malfunction of A/C-ECU
Can an operating sound be heard when the air outlet port
changeover switch is operated?
NO
Inspection procedure 15 (Refer to P.55-52.)
YES
MUT-
II
Self-Diag code
Is either code 32 or code 42 output?
YES
INSPECTION CHART FOR DIAGNOSIS CODES (Refer to
P.55-34.)
NO
Air outlet changeover damper check
NG
Repair
OK
Replace the A/C-ECU.
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