Mitsubishi Lancer Evolution 7. Manual — part 399
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-3
TROUBLESHOOTING
BASIC FLOW OF TROUBLESHOOTING
Refer to Group 00 – How to Use Troubleshooting/Inspection Service Points.
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection procedure
Reference page
Air conditioner not working at all
1
55-3
Blower motor not working
2
55-4
Air cannot be switched between inside and outside
3
55-5
Rear defogger not working
4
55-6
Cold air not coming out from the air outlet
5
55-7
Magnet clutch not working normally
6
55-8
Condenser fan not working at all
7
55-9
Condenser fan not working only for LO
8
55-10
Condenser fan not working only for HI
9
55-11
INSPECTION PROCEDURE FOR TROUBLE SYMPTOM
Inspection procedure 1
Air conditioner not working at all
Probable cause
The A/C-ECU power supply system (including earth) may be defective.
D
Harness or connector fault
D
A/C-ECU fault
NG
Repair
NG
Check the harness between the Ignition switch (IG2) and the
A/C-ECU, and repair if necessary.
NG
Repair
NG
Check the harness between the A/C-ECU and body earth, and
repair if necessary.
NG
Replace manual air conditioner control panel (A/C-ECU).
OK
Check the trouble
symptoms.
Check the following connectors:
<L.H.D.> C-32, C-08.
<R.H.D.> C-32
(2) NG
OK
Check the trouble
symptoms.
Measure at the A/C-ECU connector C-32.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
(1) <L.H.D.> Voltage between terminal 10 and body earth.
<R.H.D.> Voltage between terminal 7 and body earth.
OK : Battery voltage
(2) <L.H.D.> Continuity between terminals 12 and body earth.
<R.H.D.> Continuity between terminals 3 and body earth.
OK : Continuity
(1) NG
Check the following connectors: C-32, C-209, C-210
OK
Check the trouble
symptoms.
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-4
Inspection procedure 2
Blower motor not working
Probable cause
If the blower motor does not work, the blower motor circuit system may be
defective.
D
Blower motor fault
D
Harness or connector fault
D
A/C-ECU fault
NG
Replace
NG
Check the harness between the Ignition switch (IG2) and the
blower relay, and between fusible link No. 1 and the blower
relay, and repair if necessary.
OK
Check the trouble
symptoms.
NG
Repair
NG
Replace
OK
Check the resister. (Refer to P.55-32.)
NG
Replace
OK
Check the blower switch. (Refer to P.55-25.)
NG
Replace
OK
Check the blower relay. (Refer to P.55-22.)
NG
Repair
NG
Check the harness between the blower relay and body earth,
and repair if necessary.
OK
Check the trouble
symptoms.
Check the following connectors:
<L.H.D.> C-215, C-213.
<R.H.D.> C-215, C-213, C-08
(3) NG
OK
OK
(1) NG
Check the following connectors: C-215, C-210.
NG
Check the harness between the Ignition switch (IG2) and the
blower relay, and between fusible link No. 1 and the blower
relay, and repair if necessary.
OK
Check the trouble
symptoms.
Repair
Check the following connectors:
<L.H.D.> C-215, C-211, C-132
<R.H.D.> C-215, C-11, C-35, C-132
(2) NG
Measure at the blower relay connector C-215.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
(1) Voltage between terminals 1 and body earth
OK : Battery voltage
(2) Voltage between terminals 5 and body earth
OK : Battery voltage
(3) Continuity between terminal 3 and body earth
OK : Continuity
To the next page
Check the blower motor. (Refer to P.55-32.)
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-5
NG
Repair
NG
Repair
NG
Check the harness between the blower motor and the body
harness, and repair if necessary.
OK
Check the trouble
symptoms.
NG
Check the harness between the blower motor and the blower
relay, and repair if necessary.
OK
Check the trouble
symptoms.
Check the following connector: C-14.
(2) NG
OK
Check the trouble
symptoms.
NG
Check the harness between the blower switch and the
register, and between the register and blower motor, and
repair if necessary.
NG
Repair
OK
Measure at the blower motor connector C-14.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
D
Blower switch position:4
(1) Voltage between terminal 1 and body earth
OK : Battery voltage
(2) Continuity between terminal 2 and body earth
OK : Continuity
(1) NG
From the previous page
Check the following connectors: C-131, C-16, C-14.
Check the following connectors: C-215, C-210, C-131, C-14.
Inspection procedure 3
Air cannot be switched between inside and outside.
Probable cause
If the air cannot be switched between the inside and outside even though the
inside/outside switch is ON, the inside/outside changeover damper motor system
may be defective.
D
Inside/outside air changeover damper motor fault
D
Harness or connector fault
D
A/C-ECU fault
NG
Replace
NG
Repair
OK
OK
Check the following connectors: C-10, C-107, C-32.
NG
Check the harness between the Ignition switch (IG2) and the
inside/outside air changeover damper motor, and repair if
necessary.
OK
Check the trouble
symptoms.
NG
Repair
OK
Measure at the inside/outside air changeover damper motor
connector C-10.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
D
Voltage between terminal 7 and body earth.
OK : Battery voltage
NG
Check the following connectors: C-10, C-107, C-102, C-209,
C-210.
Check the inside/outside air changeover damper motor (Refer
to P.55-32.).
NG
Repair
OK
Replace manual air conditioner control panel (A/C-ECU).
NG
Check the trouble
symptoms.
Check the harness between the inside/outside air changeover
damper motor and the A/C-ECU.
HEATER, AIR CONDITIONER AND VENTILATION
-
Troubleshooting
55-6
Inspection procedure 4
Rear defogger not working
Probable cause
If the rear window defogger does not work even though the rear defogger switch
is ON (a 20-minute timer operates), the defogger relay system may be defective.
D
Defogger relay fault
D
Harness or connector fault
D
A/C-ECU fault
NG
Check the harness between the ignition switch (IG2) and the
defogger relay, and repair if necessary.
NG
Repair
Replace manual air conditioner control panel (A/C-ECU).
OK
OK
Check the trouble
symptoms.
NG
Check the following connectors: C-214, C-213, C-32.
OK
Check the trouble
symptoms.
NG
Replace
NG
Repair
NG
Check the harness between fusible link No. 1 and defogger
relay, and repair if necessary.
OK
Check the trouble
symptoms.
Check the following connectors:
<L.H.D.> C-214, C-211, C-132.
<R.H.D.> C-214, C-211, C-35, C-132
(2) NG
NG
Repair
NG
Check the harness between the defogger relay and the choke
coil, and repair if necessary.
OK
Check the trouble
symptoms.
Check the following connectors:
<L.H.D.> C-214, C-216, F-19.
<R.H.D.> C-214, C-217, F-19
NG
Repair
Check the following connectors: F-06.
OK
OK
Measure at the choke coil connector F-19.
D
Disconnect the connector and measure at the harness
side.
D
Ignition switch: ON
D
Voltage between terminal 1 and body earth.
OK : Battery voltage
NG
OK
Measure at the defogger relay connector C-214.
D
Disconnect the connector and measure at the junction box
side.
D
Ignition switch: ON
(1) Voltage between terminal 1 and body earth.
OK : Battery voltage
(2) Continuity between terminal 5 and body earth.
OK : Battery voltage
(1) NG
Check the following connectors: C-214, C-210.
OK
Check the trouble
symptoms.
NG
Repair
NG
Check the harness between body earth and defogger.
NG
Repair
NG
Check harness between the defogger relay and A/C-ECU.
OK
Replace choke coil.
Check the defogger (Refer to Group 54A – Defogger.).
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