A/C Ineffective - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

Inspection Procedure 21

A/C ineffective

Causes shown on right are suspected.
MUT-II Self-Diag cord
Is a diagnosis code output?
NO
Check the A/C compressor magnetic
clutch operation.
D Engine: Idling
D A/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
D A/C switch: ON
OK: Magnetic clutch operates.
D A/C switch: OFF
OK: Magnetic clutch does not
operate.
OK
Check the A/C refrigerant charge amount.
(Refer to GROUP 55 - On-vehicle Service.)
OK
MUT-II Actuator Test
D No. 37: Condenser fan (HI)
D No. 38: Condenser fan (LOW)
D Ignition switch: ON
OK: Condenser fan rotates (low speed).
OK: Condenser fan rotates (high speed).
OK
Check the Inspection Procedure 28: A/C load signal system.
(Refer to P.13A-95.)
MPI -
Troubleshooting
YES
NG
MUT-II Data list
D No. 28: A/C switch
D Engine: Idling
D A/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max Hot
D A/C switch: ON
OK: ON
D A/C switch: OFF
OK: OFF
MUT-II Data list
D No. 49: A/C relay
D Engine: Idling
D A/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
D A/C switch: ON
OK: ON
D A/C switch: OFF
OK: OFF
Refer to GROUP 55 -
Troubleshooting.
NG
NG
Probable cause
D A/C refrigerant insufficient or over- charged
D A/C compressor relay malfunction
D Condenser fan system malfunction
D A/C-ECU malfunction
D Engine-ECU malfunction
INSPECTION CHART FOR DIAGNOSIS CODE (Refer to
P.13A-12.)
NG
OK
NG
OK
Adjust the A/C refrigerant charge amount.
(Refer to GROUP 55 - On-vehicle Service.)
Check the Inspection Procedure 25: Condenser fan control
relay system. (Refer to P.13A-89.)
13A-81
Check the Inspection Procedure 26:
A/C switch system. (Refer to
P.13A-92.)
Check the Inspection Procedure 27:
A/C compressor relay system. (Refer
to P.13A-93.)