Mazda 6. Manual — part 390
U–64
TROUBLESHOOTING
FOREWORD
A6E858001038W01
• The areas for inspection (steps) are given according to various circuit malfunctions. Use the following chart to
verify the symptoms of the trouble in order to diagnose the appropriate area.
End Of Sie
TROUBLESHOOTING INDEX
A6E858001038W02
End Of Sie
TROUBLESHOOTING
No.
TROUBLESHOOTING ITEM
DESCRIPTION
1
Insufficient air (or no air) blown from vents.
• Problem with each vent and/or duct.
2
Amount of air blown from vents does not change. (Full-
auto air conditioner)
• Malfunction in blower system.
3
Amount of air blown from vents does not change. (Manual
air conditioner)
• Malfunction in blower system.
4
Air intake mode does not change.
• Air intake mode does not change when switching
REC/FRESH mode.
5
No temperature control with climate control unit.
• Malfunction in A/C unit and/or climate control unit
air mix system.
6
Windshield fogged.
• A/C compressor does not operate while airflow
mode is in DEFROSTER or HEAT/DEF modes.
• Air intake mode does not change to FRESH while
airflow mode is in DEFROSTER or HEAT/DEF
modes.
7
Air from vents not cold enough.
• Magnetic clutch operates but A/C system
malfunctions.
8
No cool air.
• Magnetic clutch does not operate.
9
Noise while operating A/C system.
• Noise from magnetic clutch, A/C compressor, hose
or refrigerant line.
TROUBLESHOOTING
U–65
U
NO.1 INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS
A6E858001038W03
Diagnostic procedure
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NO.2 AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE
A6E858001038W04
Full-auto Air Conditioner
• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are
connected correctly and undamaged.
Diagnostic procedure
1
Insufficient air (or no air) blown from vents.
DESCRIPTION
• Problem with each vent and/or duct.
POSSIBLE
CAUSE
• Malfunction in VENT mode system (Steps 1—4)
• Malfunction in HEAT mode system (Step 5)
• Malfunction in DEFROSTER mode system (Steps 6—8)
STEP
INSPECTION
ACTION
1
INSPECT TO SEE WHETHER MALFUNCTION
IS IN VENT MODE OR OTHER MODES
• Does air blow out when in VENT mode?
Yes
Go to Step 4.
No
Go to next step.
2
INSPECT VENT
• Is vent clogged?
Yes
Remove obstruction, then go to Step 8.
No
Go to next step.
3
VERIFY THAT DUCT IN DASHBOARD IS
INSTALLED
• Is duct in dashboard properly installed?
Yes
Inspect duct for clogging, deformity and air leakage, then go
to Step 8.
No
Install duct securely in the proper position, then go to Step
8.
4
INSPECT TO SEE WHETHER MALFUNCTION
IS IN HEAT MODE OR DEFROSTER MODE
• Does air blow out when in HEAT mode?
Yes
Go to next step.
No
Inspect vent for clogging, then go to Step 8.
5
INSPECT DEFROSTER MODE
• Does air blow out when in DEFROSTER
mode?
Yes
Operation is okay. Recheck malfunction symptoms.
No
Go to next step.
6
INSPECT VENT
• Is vent clogged?
Yes
Remove obstruction, then go to Step 8.
No
Go to next step.
7
VERIFY THAT DEFROSTER DUCT IS
INSTALLED
• Is defroster duct properly installed?
Yes
Inspect duct for clogging, deformity, and air leakage, then
go to next step.
No
Install duct securely in proper position, then go to next step.
8
CONFIRM THAT MALFUNCTION SYMPTOMS
DO NOT RECUR AFTER REPAIR
• Does air blow out?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
2
Amount of air blown from vents does not change.
DESCRIPTION
• Malfunction in blower system.
POSSIBLE
CAUSE
• Malfunction in blower unit (Steps 3, 4, 12)
• Malfunction in blower motor (Steps 5—9)
• Malfunction in power MOS FET system (Steps 10, 11, 13, 14)
• Malfunction in climate control unit (Step 15)
STEP
INSPECTION
ACTION
1
INSPECT BLOWER 40 A FUSE
• Inspect BLOWER 40 A fuse.
• Is it okay?
Yes
Go to next step.
No
Replace fuse, then go to Step 15. If fuse burns out
immediately, go to next step.
2
INSPECT TO SEE WHETHER MALFUNCTION
IS IN BLOWER UNIT OR ELSEWHERE
• Turn ignition switch to ON position.
• Recirculate air inside vehicle.
• Does blower unit fan rotate smoothly?
Yes
Go to Step 4.
No
Go to next step.
3
INSPECT BLOWER UNIT INTAKE VENT
• Is intake vent of blower unit clogged?
Yes
Remove obstruction, then go to Step 15.
No
Inspect if there are any obstruction in passage between
blower unit to A/C unit, then go to Step 15.
U–66
TROUBLESHOOTING
4*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN BLOWER RELAY SYSTEM OR POWER
MOS FET SYSTEM
• Turn ignition switch to ON position.
• Test voltage at the following terminal of
blower motor.
— Terminal B (blower motor operation
signal)
• Is voltage approximately 12 V?
Yes
Go to Step 8.
No
Go to next step.
5*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN FUSE BLOCK AND
BLOWER RELAY) OR ELSEWHERE
• Test voltage at the following terminal of
blower relay.
— Terminal A (IG2 signal)
— Terminal C (B+ signal)
• Is voltage approximately 12 V?
Yes
Go to next step.
No
Repair wiring harness between blower relay and BLOWER
40 A fuse, then go to Step 15.
6*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN BLOWER RELAY
AND GROUND) OR ELSEWHERE
• Test voltage at the following terminal of
blower relay.
— Terminal E (GND signal)
• Is voltage approximately 0 V?
Yes
Go to next step.
No
Repair wiring harness between blower relay and ground,
then go to Step 15.
7*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN BLOWER RELAY
AND BLOWER MOTOR) OR BLOWER RELAY
• Test voltage at the following terminal of
blower relay.
— Terminal D (blower motor operation
signal)
• Is voltage approximately 12 V?
Yes
Repair wiring harness between blower relay and blower
motor, then go to Step 15.
No
Replace blower relay, then go to Step 15.
8*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN BLOWER MOTOR OR ELSEWHERE
• Test voltage at the following terminal of
blower motor.
— Terminal B (blower motor operation
signal)
• Is voltage approximately 12 V?
Yes
Go to next step.
No
Inspect blower motor, then go to Step 15.
9*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN BLOWER MOTOR
AND POWER MOS FET) OR ELSEWHERE
• Test voltage at the following terminal of
power MOS FET.
— Terminal C (blower motor operation
signal)
• Is voltage approximately 12 V?
Yes
Go to next step.
No
Repair wiring harness between blower motor and power
MOS FET, then go to Step 15.
10*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN POWER MOS FET
AND GROUND) OR ELSEWHERE
• Test voltage at the following terminal of
power MOS FET.
— Terminal A (blower motor operation
signal)
• Is voltage approximately 0 V?
Yes
Go to next step.
No
Repair wiring harness between power MOS FET and
ground, then go to Step 15.
11
INSPECT BLOWER UNIT
• Inspect fan in blower unit.
— Is fan free of interference with blower unit
case?
— Is fan free of foreign material and
obstruction?
• Is fan okay?
Yes
Go to next step.
No
Remove obstruction, repair or replace fan and blower unit
case, then go to Step 15.
STEP
INSPECTION
ACTION
TROUBLESHOOTING
U–67
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End Of Sie
NO.3 AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE
A6E858001038W05
Manual Air Conditioner
Diagnostic procedure
12*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN POWER MOS FET OR ELSEWHERE
• Disconnect power MOS FET connector.
• Test voltage at the following terminal of
power MOS FET.
— Terminal B (blower motor control signal)
• Is voltage approximately 10 V?
Yes
Replace power MOS FET, then go to Step 15.
No
Go to next step.
13*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN POWER MOS FET
AND CLIMATE CONTROL UNIT) OR
ELSEWHERE
• Turn ignition switch to LOCK position.
• Disconnect climate control unit connector.
• Inspect for continuity at the following
terminals between power MOS FET and
climate control unit.
— Terminal B—1C (24-pin, blower motor
control signal)
— Terminal C—1A (24-pin, blower motor
feedback signal)
• Is there continuity?
Yes
Go to next step.
No
Repair wiring harness between power MOS FET and
climate control unit, then go to Step 15.
14*
INSPECT TO SEE WHETHER MALFUNCTION
IS IN CLIMATE CONTROL UNIT OR WIRING
HARNESS (SHORT TO GROUND BETWEEN
POWER MOS FET AND CLIMATE CONTROL
UNIT)
• Inspect for continuity at the following terminal
between power MOS FET and ground.
— Terminal B (blower motor control signal)—
ground
• Is there continuity?
Yes
Repair wiring harness between power MOS FET and
ground, then go to next step.
No
Replace climate control unit, then go to next step.
15
CONFIRM THAT MALFUNCTION SYMPTOMS
DO NOT RECUR AFTER REPAIR
• Is air discharged from vent?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if
malfunction recurs.
STEP
INSPECTION
ACTION
3
Amount of air blown from vents does not change.
DESCRIPTION
• Malfunction in blower system.
POSSIBLE
CAUSE
• Blower relay, blower motor, resistor, fan switch malfunction (Step 1)
• Blower unit malfunction (Steps 2—4)
STEP
INSPECTION
ACTION
1
INSPECT BLOWER SYSTEM
• Inspect the following systems and electrical
parts.
— Blower relay
— Blower motor
— Resistor
— Fan switch
— Related wiring harnesses
• Are they okay?
Yes
Go to next step.
No
Repair or replace malfunctioning part, then go to Step 5.
2
CHECK TO SEE WHETHER MALFUNCTION
IS IN BLOWER UNIT OR ELSEWHERE
• Turn ignition switch to ON position.
• Turn fan switch on.
• Recirculate air inside vehicle.
• Does fan in blower unit rotate smoothly?
Yes
Go to Step 4.
No
Go to next step.
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