Mitsubishi Lancer Evolution 7. Manual — part 400
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-7
Inspection procedure 5
Cold air not coming out from the air outlet
Probable cause
If cold air does not come out from the air outlet, the amount of refrigerant may
be inappropriate or the compressor circuit system may be defective.
D
Refrigerant line fault
D
Amount of refrigerant fault
D
Compressor fault
D
Compressor relay fault
D
Dual pressure switch fault
D
Engine-ECUfault
D
A/C-ECU fault
OK
NG
Repair
NG
Check the harness between the A/C compressor relay and the
ignition switch (IG2), and repair if necessary.
OK
Check the trouble
symptoms.
Check the following connectors:
<L.H.D.> C-12X, C-130, C-102, C-209, C-210
<R.H.D.> C-12X, C-128, D-102, C-209, C-210
NG
Repair
Check the following connectors:
<L.H.D.> C-12X, A-13, A-47.
<R.H.D.> C-12X, A-136, A-47.
OK
OK
Check the trouble
symptoms.
NG
OK
NG
Replace
OK
OK
OK
NG
Check the harness between the battery and the A/C
compressor relay., and repair if necessary.
OK
Check the trouble
symptoms.
Check the following connectors:
<L.H.D.> B-12X, A-43
<R.H.D.>B-12X, C-136.
(1) NG
Repair
NG
(2) NG
OK
Check the dual pressure switch.
OK
NG
Repair
Check the harness between the A/Compressor relay and the
A/Compressor.
NG
Repair
Check the following connectors: B-12X, C-126.
OK
Check the trouble
symptoms.
NG
OK
NG
Repair
Check the harness between the A/Compressor relay and the
Engine-ECU.
To the next page
Check refrigerant for leakage.
NG
Replace
NG
Replace
NG
NG
Replace
Check the amount of refrigerant.
Check the compressor relay.
Check the compressor magnetic clutch.
Check the refrigerant temperature switch.
Measure at the compressor relay B-12X.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
(1) Voltage between terminal 1 and body earth.
OK : Battery voltage
(2) Continuity between terminal 2 and body earth.
OK : Battery voltage
Refer to Inspection procedure 6 magnet clutch not working
normally.
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-8
Repair
Repair
NG
Replace the A/C-ECU .
Replace the Engine-ECU .
NG
Repair
Check the following connectors:
<L.H.D.> A-36, C-111, C-130, C-122, C-32.
<R.H.D.> A-36, C-111, C-128, C-122, C-32.
OK
Check the trouble
symptoms.
NG
OK
NG
Check the harness between the dual pressure switch and the
Engine-ECU.
Check the following connectors: C-32, C-111, A-36.
OK
NG
OK
NG
Check the harness between the dual pressure switch and the
A/C-ECU.
From the previous page
Check the trouble
symptoms.
Repair
NG
Inspection procedure 6
Magnet clutch not working normally
Probable cause
If the magnet clutch does not work normally, the field core or the compressor
may be defective.
D
Compressor fault
D
Field core fault
Replace the field core.
Is not the Compressor locked ?
NG
Replace the compressor and field core.
No
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-9
Inspection procedure 7
Condenser fan not working at all
Probable cause
If the condenser fan does not work at all, the condenser fan circuit system may
be defective.
D
Condenser fan motor fault
D
Harness or connector fault
D
Engine-ECU fault
NG
Check the harness betweenthe condenser fan relay (LO) and
the ignition switch (IG2) , and repair if necessary.
OK
Check the trouble
symptoms.
NG
Repair
NG
Replace
OK
Check the condenser fan motor. (Refer to P.55-40.)
NG
Check the following connectors: A-06X, C-135, C-102,
C-209, C-210.
OK
Measure at the condenser fan relay (LO) A-06X.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
D
Voltage between terminal 2 and body earth.
OK : Battery voltage
NG
Check the harness betweenthe condenser fan motor and body
earth, and repair if necessary.
OK
Check the trouble
symptoms.
Repair
NG
Check the following connectors: A-46.
NG
OK
Measure at the condenser fan motor A-46.
D
Disconnect the connector and measure at the harness
side.
D
Continuity between terminal 2 and body earth
OK : Continuity
NG
OK
Check the trouble
symptoms.
Repair
NG
Check the following connectors:
<L.H.D.> C-122, A-43, A-06X.
<R.H.D.> C-122, C-136, A-06X
Replace the Engine-ECU.
OK
Repair
NG
Check the harness betweenthe condenser fan relay (LO) and
the Engine-ECU.
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-10
Inspection procedure 8
Condenser fan not working only for LO
Probable cause
If the condenser fan does not work only for LO, the condenser fan circuit
system or the condenser fan relay (LO) circuit system may be defective.
D
Condenser fan motor fault
D
Condenser fan relay (LO) fault
D
Harness or connector fault
D
Engine-ECU fault
NG
Check the harness betweenthe condenser fan relay (LO) and
the ignition switch (IG2), and repair if necessary.
OK
Check the trouble
symptoms.
NG
Repair
NG
Replace
OK
Check the condenser fan motor. (Refer to P.55-40.)
Check the following connectors: A-06X, C-135, C-102,
C-209, C-210.
OK
NG
OK
Check the trouble
symptoms.
Repair
Check the following connectors: A-06X.
NG
NG
OK
Check the trouble
symptoms.
Repair
NG
Check the following connectors:
<L.H.D.> A-06X, A-43, C-122.
<R.H.D.> A-06X, C-136, C-122.
Replace the Engine-ECU .
OK
Repair
NG
Check the harness betweenthe condenser fan relay (LO) and
the Engine-ECU.
(2) NG
Measure at the condenser fan relay (LO) A-06X.
D
Disconnect the connector and measure at the junction box
side.
D
Ignition switch: ON
(1) Voltage between terminal 2 and body earth.
OK : Battery voltage
(2) Voltage between terminal 4 and body earth.
OK : Battery voltage
(1) NG
NG
Replace
OK
Check the condenser fan relay (LO) (Refer to P.55-23.)
NG
OK
Check the trouble
symptoms.
Repair
Check the following connectors: A-06X, A-45.
OK
Check the harness betweenthe condenser fan relay (LO) and
the condenser fan motor, and repair if necessary.
Check the harness betweenthe condenser fan relay (LO) and
the battery, and repair if necessary.
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